feat: redesign bench calibration (factor/offset), add Ttank/P2 displays, fix sensor calibration

- Replace P1-P6 rational transfer function with factor/offset model for bench params
- Add explicit rx/tx direction flags in bench XML configuration
- Add T.Tank (BenchTemp) and P2 (AnalogSensor2) to temperature/pressure display
- Apply SensorConfiguration calibration to pressure channels, fix empty sensors.xml fallback
- Add live value labels to flowmeter charts
- Hide pump live values and PSG encoder standalone label
- Add K-Line connection state model, improve KWP service and status displays
- Restructure .claude/skills into subdirectory format

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Infrastructure/Kwp/KW1281Connection.cs

@@ -299,7 +299,9 @@ namespace HC_APTBS.Infrastructure.Kwp
             {
                 var packet = ReceivePacket();
 				packets.Add(packet); // TODO: Maybe don't add the packet if it's an Ack
-				if (packet is AckPacket || packet is NakPacket)
+                //SendAckPacket();
+
+                if (packet is AckPacket || packet is NakPacket)
                 {
                     break;
                 }

Infrastructure/Pcan/PcanAdapter.cs

@@ -398,9 +398,10 @@ namespace HC_APTBS.Infrastructure.Pcan
 
                 double previousValue = param.Value;
 
-                if (param.Name == BenchParameterNames.Temp || param.Name == PumpParameterNames.Temp)
+                if (param.Name == PumpParameterNames.Temp)
                 {
-                    // Temperature uses a special packed BCD / signed format depending on sensor type.
+                    // Only pump "Temp" uses BCD / signed format. Bench temperatures
+                    // ("BenchTemp", "T-in", etc.) go through the generic path below.
                     param.Value = DecodeTempValue(data, param);
                 }
                 else if (param.Name == PumpParameterNames.Rpm)
@@ -413,23 +414,34 @@ namespace HC_APTBS.Infrastructure.Pcan
                 {
                     // Generic 1-byte, 2-byte, or 3-byte big-endian integer.
                     int byteSpan = Math.Abs(param.ByteH - param.ByteL);
+                    double rawValue;
                     if (byteSpan == 0)
                     {
-                        param.Value = data[param.ByteL];
+                        rawValue = data[param.ByteL];
                     }
                     else if (byteSpan == 1)
                     {
-                        param.Value = (data[param.ByteH] << 8) | data[param.ByteL];
+                        rawValue = (data[param.ByteH] << 8) | data[param.ByteL];
                     }
                     else
                     {
                         // 3-byte little-endian variant used for encoder/pulse counters.
-                        param.Value = (data[param.ByteL + 2] << 16)
-                                    | (data[param.ByteL + 1] << 8)
-                                    | data[param.ByteL];
+                        rawValue = (data[param.ByteL + 2] << 16)
+                                 | (data[param.ByteL + 1] << 8)
+                                 | data[param.ByteL];
                     }
 
-                    param.Value = param.GetTransformResult();
+                    if (param.UseLegacyTransform)
+                    {
+                        // Pump params: store raw then apply P1-P6 rational transfer function.
+                        param.Value = rawValue;
+                        param.Value = param.GetTransformResult();
+                    }
+                    else
+                    {
+                        // Bench params: apply factor/offset calibration directly.
+                        param.Value = param.Calibrate(rawValue);
+                    }
                     if (double.IsInfinity(param.Value)) param.Value = 0;
                 }
 

MainWindow.xaml

@@ -5,6 +5,7 @@
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
         xmlns:vm="clr-namespace:HC_APTBS.ViewModels"
         xmlns:uc="clr-namespace:HC_APTBS.Views.UserControls"
+        xmlns:models="clr-namespace:HC_APTBS.Models"
         mc:Ignorable="d"
         Title="HC_APTBS — Herlic Test Bench"
         Height="1080" Width="1920"
@@ -174,9 +175,12 @@
                                     <Border.Style>
                                         <Style TargetType="Border" BasedOn="{StaticResource ConnIndicator}">
                                             <Style.Triggers>
-                                                <DataTrigger Binding="{Binding IsKLineConnected}" Value="True">
+                                                <DataTrigger Binding="{Binding KLineState}" Value="{x:Static models:KLineConnectionState.Connected}">
                                                     <Setter Property="Background" Value="#26C200"/>
                                                 </DataTrigger>
+                                                <DataTrigger Binding="{Binding KLineState}" Value="{x:Static models:KLineConnectionState.Failed}">
+                                                    <Setter Property="Background" Value="#FF3333"/>
+                                                </DataTrigger>
                                             </Style.Triggers>
                                         </Style>
                                     </Border.Style>
@@ -245,22 +249,30 @@
                                             <RowDefinition/>
                                             <RowDefinition/>
                                             <RowDefinition/>
+                                            <RowDefinition/>
+                                            <RowDefinition/>
                                         </Grid.RowDefinitions>
 
-                                        <TextBlock Text="T. In:"  Grid.Row="0" VerticalAlignment="Center" Foreground="#EBEBFF" FontSize="13"/>
-                                        <TextBlock Text="T. Out:" Grid.Row="1" VerticalAlignment="Center" Foreground="#EBEBFF" FontSize="13"/>
-                                        <TextBlock Text="T. 4:"   Grid.Row="2" VerticalAlignment="Center" Foreground="#EBEBFF" FontSize="13"/>
-                                        <TextBlock Text="Pres.:"  Grid.Row="3" VerticalAlignment="Center" Foreground="#EBEBFF" FontSize="13"/>
+                                        <TextBlock Text="T. In:"   Grid.Row="0" VerticalAlignment="Center" Foreground="#EBEBFF" FontSize="13"/>
+                                        <TextBlock Text="T. Out:"  Grid.Row="1" VerticalAlignment="Center" Foreground="#EBEBFF" FontSize="13"/>
+                                        <TextBlock Text="T. 4:"    Grid.Row="2" VerticalAlignment="Center" Foreground="#EBEBFF" FontSize="13"/>
+                                        <TextBlock Text="T. Tank:" Grid.Row="3" VerticalAlignment="Center" Foreground="#EBEBFF" FontSize="13"/>
+                                        <TextBlock Text="P1:"      Grid.Row="4" VerticalAlignment="Center" Foreground="#EBEBFF" FontSize="13"/>
+                                        <TextBlock Text="P2:"      Grid.Row="5" VerticalAlignment="Center" Foreground="#EBEBFF" FontSize="13"/>
 
-                                        <TextBlock Text="{Binding TempIn,   StringFormat=F1}" Grid.Row="0" Grid.Column="1" HorizontalAlignment="Right" Foreground="#EBEBFF" FontSize="20" FontFamily="Consolas"/>
-                                        <TextBlock Text="{Binding TempOut,  StringFormat=F1}" Grid.Row="1" Grid.Column="1" HorizontalAlignment="Right" Foreground="#EBEBFF" FontSize="20" FontFamily="Consolas"/>
-                                        <TextBlock Text="{Binding Temp4,    StringFormat=F1}" Grid.Row="2" Grid.Column="1" HorizontalAlignment="Right" Foreground="#EBEBFF" FontSize="20" FontFamily="Consolas"/>
-                                        <TextBlock Text="{Binding Pressure, StringFormat=F1}" Grid.Row="3" Grid.Column="1" HorizontalAlignment="Right" Foreground="#EBEBFF" FontSize="20" FontFamily="Consolas"/>
+                                        <TextBlock Text="{Binding TempIn,    StringFormat=F1}" Grid.Row="0" Grid.Column="1" HorizontalAlignment="Right" Foreground="#EBEBFF" FontSize="20" FontFamily="Consolas"/>
+                                        <TextBlock Text="{Binding TempOut,   StringFormat=F1}" Grid.Row="1" Grid.Column="1" HorizontalAlignment="Right" Foreground="#EBEBFF" FontSize="20" FontFamily="Consolas"/>
+                                        <TextBlock Text="{Binding Temp4,     StringFormat=F1}" Grid.Row="2" Grid.Column="1" HorizontalAlignment="Right" Foreground="#EBEBFF" FontSize="20" FontFamily="Consolas"/>
+                                        <TextBlock Text="{Binding BenchTemp, StringFormat=F1}" Grid.Row="3" Grid.Column="1" HorizontalAlignment="Right" Foreground="#EBEBFF" FontSize="20" FontFamily="Consolas"/>
+                                        <TextBlock Text="{Binding Pressure,  StringFormat=F1}" Grid.Row="4" Grid.Column="1" HorizontalAlignment="Right" Foreground="#EBEBFF" FontSize="20" FontFamily="Consolas"/>
+                                        <TextBlock Text="{Binding Pressure2, StringFormat=F1}" Grid.Row="5" Grid.Column="1" HorizontalAlignment="Right" Foreground="#EBEBFF" FontSize="20" FontFamily="Consolas"/>
 
                                         <TextBlock Text="°C"  Grid.Row="0" Grid.Column="2" Foreground="#EBEBFF" FontSize="13" VerticalAlignment="Center" Margin="4,0"/>
                                         <TextBlock Text="°C"  Grid.Row="1" Grid.Column="2" Foreground="#EBEBFF" FontSize="13" VerticalAlignment="Center" Margin="4,0"/>
                                         <TextBlock Text="°C"  Grid.Row="2" Grid.Column="2" Foreground="#EBEBFF" FontSize="13" VerticalAlignment="Center" Margin="4,0"/>
-                                        <TextBlock Text="bar" Grid.Row="3" Grid.Column="2" Foreground="#EBEBFF" FontSize="13" VerticalAlignment="Center" Margin="4,0"/>
+                                        <TextBlock Text="°C"  Grid.Row="3" Grid.Column="2" Foreground="#EBEBFF" FontSize="13" VerticalAlignment="Center" Margin="4,0"/>
+                                        <TextBlock Text="bar" Grid.Row="4" Grid.Column="2" Foreground="#EBEBFF" FontSize="13" VerticalAlignment="Center" Margin="4,0"/>
+                                        <TextBlock Text="bar" Grid.Row="5" Grid.Column="2" Foreground="#EBEBFF" FontSize="13" VerticalAlignment="Center" Margin="4,0"/>
                                     </Grid>
                                 </Border>
 
@@ -286,7 +298,7 @@
                                 </Border>
 
                                 <!-- Pump live values -->
-                                <Border BorderBrush="#888" BorderThickness="1" Margin="0,4" Padding="8,4">
+                                <Border BorderBrush="#888" BorderThickness="1" Margin="0,4" Padding="8,4" Visibility="Collapsed">
                                     <Grid>
                                         <Grid.ColumnDefinitions>
                                             <ColumnDefinition Width="70"/>
@@ -310,7 +322,7 @@
                                 </Border>
 
                                 <!-- PSG encoder value -->
-                                <StackPanel Orientation="Horizontal" Margin="0,4">
+                                <StackPanel Orientation="Horizontal" Margin="0,4" Visibility="Collapsed">
                                     <TextBlock Text="PSG Encoder:" VerticalAlignment="Center" FontSize="12" Margin="0,0,8,0"/>
                                     <TextBlock Text="{Binding PsgEncoderValue, StringFormat=F2}"
                                                FontSize="16" FontFamily="Consolas" VerticalAlignment="Center"/>

Models/CanBusParameter.cs

@@ -8,13 +8,12 @@ namespace HC_APTBS.Models
     /// Represents a single logical parameter exchanged over CAN.
     /// Each parameter occupies up to two bytes within a CAN frame identified by <see cref="MessageId"/>.
     ///
-    /// <para><b>Transfer function (transmit / non-receive):</b><br/>
-    /// <c>output = ((P1 * Value + P2) / (P3 * Value + P4)) + P5 + P6</c></para>
+    /// <para><b>Bench params</b> use the simple calibration model:<br/>
+    ///   Linear:  <c>eng = raw * Factor + Offset</c><br/>
+    ///   Inverse: <c>eng = Factor / raw + Offset</c></para>
     ///
-    /// <para><b>Inverse transfer function (receive):</b><br/>
-    /// <c>output = (−P2 − P3·P5 − P4·P6 + P4·Value) / (P1 + P3·P5 + P3·P6 − P3·Value)</c></para>
-    ///
-    /// <para>Set <see cref="DisableCalibration"/> to use the identity transform (P1=1, P2=0, P3=0, P4=1, P5=0, P6=0).</para>
+    /// <para><b>Pump params</b> (legacy) use the P1–P6 rational transfer function via
+    /// <see cref="GetTransformResult"/>. Set <see cref="UseLegacyTransform"/> to enable.</para>
     /// </summary>
     public class CanBusParameter
     {
@@ -40,7 +39,18 @@ namespace HC_APTBS.Models
         /// </summary>
         public int Type { get; set; } = 0;
 
-        // ── Calibration coefficients (P1–P6) ─────────────────────────────────────
+        // ── Simple calibration (bench params) ────────────────────────────────────
+
+        /// <summary>Multiplication factor: <c>eng = raw * Factor + Offset</c>.</summary>
+        public double Factor { get; set; } = 1.0;
+
+        /// <summary>Additive offset: <c>eng = raw * Factor + Offset</c>.</summary>
+        public double Offset { get; set; }
+
+        /// <summary>When true, calibration uses <c>eng = Factor / raw + Offset</c>.</summary>
+        public bool IsInverse { get; set; }
+
+        // ── Legacy P1–P6 calibration (pump params) ───────────────────────────────
 
         /// <summary>Transfer function coefficient P1 (numerator multiplier).</summary>
         public double P1 { get; set; }
@@ -66,6 +76,12 @@ namespace HC_APTBS.Models
         /// </summary>
         public bool DisableCalibration { get; set; }
 
+        /// <summary>
+        /// When true, <see cref="GetTransformResult"/> is used instead of
+        /// <see cref="Calibrate"/>. Enabled for pump params loaded via <see cref="FromXml"/>.
+        /// </summary>
+        public bool UseLegacyTransform { get; set; }
+
         // ── Runtime state ─────────────────────────────────────────────────────────
 
         /// <summary>Current decoded engineering-unit value (updated by the CAN read thread).</summary>
@@ -78,8 +94,8 @@ namespace HC_APTBS.Models
         public bool NeedsUpdate { get; set; }
 
         /// <summary>
-        /// When true this parameter is used in the receive direction and applies the
-        /// inverse transfer function in <see cref="GetTransformResult"/>.
+        /// True for receive-direction params (decoded from incoming CAN frames).
+        /// False for transmit-direction params (packed into outgoing frames).
         /// </summary>
         public bool IsReceive { get; set; }
 
@@ -98,33 +114,62 @@ namespace HC_APTBS.Models
             set => MessageId = value;
         }
 
-        // ── Transfer function ─────────────────────────────────────────────────────
+        // ── Simple calibration ────────────────────────────────────────────────────
 
         /// <summary>
-        /// Applies the calibration transfer function to <see cref="Value"/>.
+        /// Converts a raw CAN value to engineering units using Factor/Offset.
+        /// </summary>
+        public double Calibrate(double raw)
+        {
+            if (IsInverse)
+                return raw != 0 ? Factor / raw + Offset : 0;
+            return raw * Factor + Offset;
+        }
+
+        /// <summary>
+        /// Converts an engineering value back to raw CAN value (for transmit).
+        /// </summary>
+        public double CalibrateReverse(double eng)
+        {
+            if (IsInverse)
+            {
+                double denom = eng - Offset;
+                return denom != 0 ? Factor / denom : 0;
+            }
+            return Factor != 0 ? (eng - Offset) / Factor : 0;
+        }
+
+        // ── Legacy P1–P6 transfer function (pump params) ─────────────────────────
+
+        /// <summary>
+        /// Applies the P1–P6 rational transfer function to <see cref="Value"/>.
+        /// Used only by pump params (<see cref="UseLegacyTransform"/> = true).
         /// </summary>
-        /// <returns>Calibrated engineering-unit result.</returns>
         public double GetTransformResult()
         {
             if (IsReceive)
             {
-                // Inverse function: maps a measured value back to the raw command value.
                 return (-P2 - P3 * P5 - P4 * P6 + P4 * Value)
                      / (P1 + P3 * P5 + P3 * P6 - P3 * Value);
             }
 
-            // Forward function: maps a setpoint to the raw CAN integer to transmit.
             return ((P1 * Value + P2) / (P3 * Value + P4)) + P5 + P6;
         }
 
         /// <summary>
-        /// Returns the rounded integer value ready to be packed into a CAN frame byte pair.
+        /// Returns the raw CAN value for transmission.
+        /// Delegates to simple or legacy calibration depending on param type.
         /// </summary>
-        public double GetTransmitValue() => GetTransformResult();
+        public double GetTransmitValue()
+        {
+            if (UseLegacyTransform)
+                return GetTransformResult();
+            return CalibrateReverse(Value);
+        }
 
         /// <summary>
         /// Resets calibration coefficients to the identity transform so the raw value
-        /// passes through <see cref="GetTransformResult"/> unchanged.
+        /// passes through unchanged.
         /// </summary>
         public void SetIdentityCalibration()
         {
@@ -152,7 +197,8 @@ namespace HC_APTBS.Models
                                 StringComparison.OrdinalIgnoreCase),
                 Alpha     = ParseDecimal(xe.Attribute("filter")?.Value, 1.0),
                 DisableCalibration = string.Equals(xe.Attribute("disableparams")?.Value,
-                                         "true", StringComparison.OrdinalIgnoreCase)
+                                         "true", StringComparison.OrdinalIgnoreCase),
+                UseLegacyTransform = true
             };
 
             if (p.DisableCalibration)
@@ -173,7 +219,7 @@ namespace HC_APTBS.Models
         }
 
         /// <summary>Parses a decimal string that may use comma or dot as separator.</summary>
-        private static double ParseDecimal(string? value, double fallback)
+        internal static double ParseDecimal(string? value, double fallback)
         {
             if (string.IsNullOrEmpty(value)) return fallback;
             return double.Parse(value.Replace(',', '.'), CultureInfo.InvariantCulture);
@@ -183,22 +229,19 @@ namespace HC_APTBS.Models
         public XElement ToXml()
         {
             var elm = new XElement(Name,
-                new XAttribute("id",           MessageId.ToString("X")),
-                new XAttribute("byteh",        ByteH),
-                new XAttribute("bytel",        ByteL),
-                new XAttribute("filter",       Alpha),
-                new XAttribute("disableparams", DisableCalibration));
+                new XAttribute("id",        MessageId.ToString("X")),
+                new XAttribute("byteh",     ByteH),
+                new XAttribute("bytel",     ByteL),
+                new XAttribute("direction", IsReceive ? "rx" : "tx"));
 
-            if (!DisableCalibration)
-            {
-                elm.Add(
-                    new XAttribute("p1", P1),
-                    new XAttribute("p2", P2),
-                    new XAttribute("p3", P3),
-                    new XAttribute("p4", P4),
-                    new XAttribute("p5", P5),
-                    new XAttribute("p6", P6));
-            }
+            if (Alpha != 1.0)
+                elm.Add(new XAttribute("filter", Alpha));
+            if (Factor != 1.0)
+                elm.Add(new XAttribute("factor", Factor));
+            if (Offset != 0.0)
+                elm.Add(new XAttribute("offset", Offset));
+            if (IsInverse)
+                elm.Add(new XAttribute("type", "inverse"));
 
             return elm;
         }

Models/KLineConnectionState.cs

@@ -0,0 +1,17 @@
+namespace HC_APTBS.Models
+{
+    /// <summary>
+    /// Represents the current state of the K-Line diagnostic session.
+    /// </summary>
+    public enum KLineConnectionState
+    {
+        /// <summary>No session established (indicator: gray).</summary>
+        Disconnected,
+
+        /// <summary>Session active and keep-alive succeeding (indicator: green).</summary>
+        Connected,
+
+        /// <summary>Session lost — keep-alive or operation failed (indicator: red).</summary>
+        Failed
+    }
+}

Services/IKwpService.cs

@@ -2,6 +2,7 @@ using System;
 using System.Collections.Generic;
 using System.Threading;
 using System.Threading.Tasks;
+using HC_APTBS.Models;
 
 namespace HC_APTBS.Services
 {
@@ -11,6 +12,31 @@ namespace HC_APTBS.Services
     /// </summary>
     public interface IKwpService
     {
+        // ── Session lifecycle ─────────────────────────────────────────────────────
+
+        /// <summary>Current state of the persistent K-Line session.</summary>
+        KLineConnectionState KLineState { get; }
+
+        /// <summary>
+        /// Raised whenever the K-Line session state transitions.
+        /// Fires on a background thread; consumers must marshal to the UI thread.
+        /// </summary>
+        event Action<KLineConnectionState>? KLineStateChanged;
+
+        /// <summary>
+        /// Opens a persistent K-Line session: performs 5-baud slow-init,
+        /// reads ECU info, then starts a background keep-alive loop (~1 s interval).
+        /// </summary>
+        /// <param name="port">FTDI serial number or COM port identifier.</param>
+        /// <param name="ct">Cancellation token.</param>
+        Task ConnectAsync(string port, CancellationToken ct = default);
+
+        /// <summary>
+        /// Stops the keep-alive loop, sends EndCommunication to the ECU,
+        /// and disposes the FTDI interface.
+        /// </summary>
+        void Disconnect();
+
         // ── Progress reporting ────────────────────────────────────────────────────
 
         /// <summary>
@@ -84,6 +110,22 @@ namespace HC_APTBS.Services
         /// </summary>
         string? DetectKLinePort();
 
+        // ── Mid-read notifications ────────────────────────────────────────────
+
+        /// <summary>
+        /// Raised during <see cref="ReadAllInfoAsync"/> as soon as the pump identifier
+        /// string has been read from ROM, before the full read completes.
+        /// Fires on a background thread; consumers must marshal to the UI thread.
+        /// </summary>
+        event Action<string>? PumpIdentified;
+
+        /// <summary>
+        /// Raised during <see cref="ReadAllInfoAsync"/> when the DFI calibration
+        /// value has been read from EEPROM. Parameter is the DFI angle in degrees.
+        /// Fires on a background thread; consumers must marshal to the UI thread.
+        /// </summary>
+        event Action<double>? DfiRead;
+
         // ── Power cycle callbacks ─────────────────────────────────────────────────
 
         /// <summary>

Services/Impl/ConfigurationService.cs

@@ -409,24 +409,28 @@ namespace HC_APTBS.Services.Impl
         private void LoadSensors()
         {
             _settings ??= new AppSettings();
-            if (!File.Exists(SensorsXml))
+            if (File.Exists(SensorsXml))
             {
-                _settings.Sensors[1] = SensorConfiguration.DefaultPressureSensor();
-                return;
-            }
-            try
-            {
-                var xdoc = XDocument.Load(SensorsXml);
-                foreach (var xs in xdoc.Root!.Elements("sensor"))
+                try
                 {
-                    var sc = SensorConfiguration.FromXml(xs);
-                    _settings.Sensors[sc.Number] = sc;
+                    var xdoc = XDocument.Load(SensorsXml);
+                    foreach (var xs in xdoc.Root!.Elements("sensor"))
+                    {
+                        var sc = SensorConfiguration.FromXml(xs);
+                        _settings.Sensors[sc.Number] = sc;
+                    }
+                }
+                catch (Exception ex)
+                {
+                    _log.Error(LogId, $"LoadSensors failed: {ex.Message}");
                 }
             }
-            catch (Exception ex)
-            {
-                _log.Error(LogId, $"LoadSensors failed: {ex.Message}");
-            }
+
+            // Ensure default calibrations exist for the two analogue channels.
+            if (!_settings.Sensors.ContainsKey(1))
+                _settings.Sensors[1] = SensorConfiguration.DefaultPressureSensor();
+            if (!_settings.Sensors.ContainsKey(2))
+                _settings.Sensors[2] = new SensorConfiguration { Number = 2, SensorName = "AnalogSensor2" };
         }
 
         private void LoadClients()
@@ -463,37 +467,28 @@ namespace HC_APTBS.Services.Impl
 
         // ── Parsing helpers ───────────────────────────────────────────────────────
 
+        /// <summary>
+        /// Parses a bench CAN parameter from an XML element.
+        /// Uses the clean factor/offset calibration model with explicit direction flags.
+        /// </summary>
         private static CanBusParameter ParseParamElement(XElement xe)
         {
-            var p = new CanBusParameter
+            string direction = xe.Attribute("direction")?.Value ?? "rx";
+
+            return new CanBusParameter
             {
                 Name       = xe.Name.LocalName,
                 MessageId  = Convert.ToUInt32(xe.Attribute("id")?.Value ?? "0", 16),
                 ByteH      = ushort.Parse(xe.Attribute("byteh")?.Value  ?? "0"),
                 ByteL      = ushort.Parse(xe.Attribute("bytel")?.Value  ?? "0"),
-                Alpha      = double.Parse(xe.Attribute("filter")?.Value ?? "1",
-                                 System.Globalization.CultureInfo.InvariantCulture),
-                DisableCalibration = bool.Parse(xe.Attribute("disableparams")?.Value ?? "true"),
-                // Bench params default to receive unless explicitly marked send="true".
-                IsReceive  = !string.Equals(xe.Attribute("send")?.Value, "true",
-                                 StringComparison.OrdinalIgnoreCase)
+                Alpha      = CanBusParameter.ParseDecimal(xe.Attribute("filter")?.Value, 1.0),
+                IsReceive  = string.Equals(direction, "rx", StringComparison.OrdinalIgnoreCase),
+                Factor     = CanBusParameter.ParseDecimal(xe.Attribute("factor")?.Value, 1.0),
+                Offset     = CanBusParameter.ParseDecimal(xe.Attribute("offset")?.Value, 0.0),
+                IsInverse  = string.Equals(xe.Attribute("type")?.Value, "inverse",
+                                 StringComparison.OrdinalIgnoreCase),
+                UseLegacyTransform = false,
             };
-
-            if (!p.DisableCalibration)
-            {
-                p.P1 = double.Parse(xe.Attribute("p1")?.Value ?? "1", System.Globalization.CultureInfo.InvariantCulture);
-                p.P2 = double.Parse(xe.Attribute("p2")?.Value ?? "0", System.Globalization.CultureInfo.InvariantCulture);
-                p.P3 = double.Parse(xe.Attribute("p3")?.Value ?? "0", System.Globalization.CultureInfo.InvariantCulture);
-                p.P4 = double.Parse(xe.Attribute("p4")?.Value ?? "1", System.Globalization.CultureInfo.InvariantCulture);
-                p.P5 = double.Parse(xe.Attribute("p5")?.Value ?? "0", System.Globalization.CultureInfo.InvariantCulture);
-                p.P6 = double.Parse(xe.Attribute("p6")?.Value ?? "0", System.Globalization.CultureInfo.InvariantCulture);
-            }
-            else
-            {
-                p.SetIdentityCalibration();
-            }
-
-            return p;
         }
 
         private void ParseRelayElement(XElement xr)
@@ -576,30 +571,37 @@ namespace HC_APTBS.Services.Impl
 
         // ── Default bench XML ─────────────────────────────────────────────────────
 
-        /// <summary>Returns the factory-default bench parameter XML used when bench.xml is absent.</summary>
+        /// <summary>
+        /// Returns the factory-default bench parameter XML used when bench.xml is absent.
+        /// Uses direction/factor/offset calibration model.  Defaults: direction="rx", factor=1, offset=0, type="linear".
+        /// </summary>
         private static string DefaultBenchXml() => @"<?xml version=""1.0"" encoding=""utf-8""?>
 <Bench>
-  <RPM id=""10"" byteh=""1"" bytel=""0"" filter=""1"" disableparams=""true"" send=""true"" />
-  <Counter id=""11"" byteh=""1"" bytel=""0"" filter=""1"" disableparams=""true"" send=""true"" />
-  <BaudRate id=""55"" byteh=""0"" bytel=""0"" filter=""1"" disableparams=""true"" send=""true"" />
-  <BenchRPM id=""13"" byteh=""1"" bytel=""0"" filter=""1"" disableparams=""true"" />
-  <BenchCounter id=""13"" byteh=""3"" bytel=""2"" filter=""1"" disableparams=""true"" />
-  <BenchTemp id=""14"" byteh=""1"" bytel=""0"" filter=""1"" disableparams=""false"" p1=""1"" p2=""0"" p3=""0"" p4=""10"" p5=""-20"" p6=""0"" />
-  <T-in id=""14"" byteh=""3"" bytel=""2"" filter=""1"" disableparams=""false"" p1=""1"" p2=""0"" p3=""0"" p4=""10"" p5=""-20"" p6=""0"" />
-  <T-out id=""14"" byteh=""5"" bytel=""4"" filter=""1"" disableparams=""false"" p1=""1"" p2=""0"" p3=""0"" p4=""10"" p5=""-20"" p6=""0"" />
-  <T4 id=""14"" byteh=""7"" bytel=""6"" filter=""1"" disableparams=""false"" p1=""1"" p2=""0"" p3=""0"" p4=""10"" p5=""-20"" p6=""0"" />
-  <QDelivery id=""8"" byteh=""5"" bytel=""3"" filter=""0.01"" disableparams=""false"" p1=""0"" p2=""2.03"" p3=""1E-06"" p4=""0"" p5=""0"" p6=""0"" />
-  <QOver id=""8"" byteh=""2"" bytel=""0"" filter=""0.11"" disableparams=""false"" p1=""0"" p2=""0.51"" p3=""1E-06"" p4=""0"" p5=""0"" p6=""0"" />
-  <PSGEncoderValue id=""50"" byteh=""4"" bytel=""5"" filter=""1"" disableparams=""false"" p1=""1"" p2=""0"" p3=""0"" p4=""1"" p5=""0"" p6=""0"" />
-  <PSGEncoderWorking id=""50"" byteh=""7"" bytel=""7"" filter=""1"" disableparams=""true"" />
-  <InyectorEncoderValue id=""50"" byteh=""2"" bytel=""3"" filter=""1"" disableparams=""false"" p1=""1"" p2=""0"" p3=""0"" p4=""1"" p5=""0"" p6=""0"" />
-  <InyectorEncoderWorking id=""50"" byteh=""6"" bytel=""6"" filter=""1"" disableparams=""false"" p1=""1"" p2=""0"" p3=""0"" p4=""1"" p5=""0"" p6=""0"" />
-  <ManualEncoderValue id=""50"" byteh=""0"" bytel=""1"" filter=""1"" disableparams=""false"" p1=""1"" p2=""0"" p3=""0"" p4=""1"" p5=""0"" p6=""0"" />
-  <EncoderResolution id=""51"" byteh=""6"" bytel=""7"" filter=""1"" disableparams=""true"" send=""true"" />
-  <ElectronicMsg id=""51"" byteh=""0"" bytel=""0"" filter=""1"" disableparams=""true"" send=""true"" />
-  <Alarms id=""8"" byteh=""7"" bytel=""6"" filter=""1"" disableparams=""true"" />
-  <Pressure id=""13"" byteh=""4"" bytel=""5"" filter=""1"" disableparams=""true"" />
-  <AnalogicSensor2 id=""13"" byteh=""6"" bytel=""7"" filter=""1"" disableparams=""true"" />
+  <!-- TX: values sent from software to bench controller -->
+  <RPM id=""10"" byteh=""1"" bytel=""0"" direction=""tx"" />
+  <Counter id=""11"" byteh=""1"" bytel=""0"" direction=""tx"" />
+  <BaudRate id=""55"" byteh=""0"" bytel=""0"" direction=""tx"" />
+  <EncoderResolution id=""51"" byteh=""6"" bytel=""7"" direction=""tx"" />
+  <ElectronicMsg id=""51"" byteh=""0"" bytel=""0"" direction=""tx"" />
+
+  <!-- RX: values received from bench controller (direction=""rx"" is the default) -->
+  <BenchRPM id=""13"" byteh=""1"" bytel=""0"" />
+  <BenchCounter id=""13"" byteh=""3"" bytel=""2"" />
+  <BenchTemp id=""14"" byteh=""1"" bytel=""0"" factor=""0.1"" offset=""-20"" />
+  <T-in id=""14"" byteh=""3"" bytel=""2"" factor=""0.1"" offset=""-20"" />
+  <T-out id=""14"" byteh=""5"" bytel=""4"" factor=""0.1"" offset=""-20"" />
+  <T4 id=""14"" byteh=""7"" bytel=""6"" factor=""0.1"" offset=""-20"" />
+  <QDelivery id=""8"" byteh=""5"" bytel=""3"" factor=""2030000"" type=""inverse"" filter=""0.01"" />
+  <QOver id=""8"" byteh=""2"" bytel=""0"" factor=""510000"" type=""inverse"" filter=""0.11"" />
+  <PSGEncoderValue id=""50"" byteh=""4"" bytel=""5"" />
+  <PSGEncoderWorking id=""50"" byteh=""7"" bytel=""7"" />
+  <InyectorEncoderValue id=""50"" byteh=""2"" bytel=""3"" />
+  <InyectorEncoderWorking id=""50"" byteh=""6"" bytel=""6"" />
+  <ManualEncoderValue id=""50"" byteh=""0"" bytel=""1"" />
+  <Alarms id=""8"" byteh=""7"" bytel=""6"" />
+  <Pressure id=""13"" byteh=""4"" bytel=""5"" />
+  <AnalogicSensor2 id=""13"" byteh=""6"" bytel=""7"" />
+
   <Reles>
     <Rele name=""Electronic"" id=""15"" bit=""0"" />
     <Rele name=""OilPump"" id=""15"" bit=""4"" />

Services/Impl/KwpService.cs

@@ -17,7 +17,7 @@ namespace HC_APTBS.Services.Impl
     /// K-Line baud rate is 9600 bps.
     /// </para>
     /// </summary>
-    public sealed class KwpService : IKwpService
+    public sealed class KwpService : IKwpService, IDisposable
     {
         // ── Protocol constants ────────────────────────────────────────────────────
 
@@ -27,20 +27,52 @@ namespace HC_APTBS.Services.Impl
         /// <summary>K-Line baud rate (bps) for all VP44 communications.</summary>
         private const int KLineBaudRate = 9600;
 
+        /// <summary>Interval between keep-alive ACK packets (ms).</summary>
+        private const int KeepAliveIntervalMs = 1000;
+
         private readonly IAppLogger _log;
         private const string LogId = "KwpService";
 
+        // ── Persistent session fields ─────────────────────────────────────────────
+
+        private FtdiInterface? _sessionIface;
+        private KwpCommon? _sessionKwpCommon;
+        private KW1281Connection? _sessionKwp;
+        private string? _connectedPort;
+
+        // ── Synchronization ───────────────────────────────────────────────────────
+
+        private readonly SemaphoreSlim _busLock = new(1, 1);
+        private CancellationTokenSource? _keepAliveCts;
+        private Task? _keepAliveTask;
+
         // ── Events ────────────────────────────────────────────────────────────────
 
         /// <inheritdoc/>
         public event Action<int, string>? ProgressChanged;
 
+        /// <inheritdoc/>
+        public event Action<string>? PumpIdentified;
+
+        /// <inheritdoc/>
+        public event Action<double>? DfiRead;
+
         /// <inheritdoc/>
         public event Action? PumpDisconnectRequested;
 
         /// <inheritdoc/>
         public event Action? PumpReconnectRequested;
 
+        /// <inheritdoc/>
+        public event Action<KLineConnectionState>? KLineStateChanged;
+
+        // ── Session state ─────────────────────────────────────────────────────────
+
+        private KLineConnectionState _kLineState = KLineConnectionState.Disconnected;
+
+        /// <inheritdoc/>
+        public KLineConnectionState KLineState => _kLineState;
+
         // ── Constructor ───────────────────────────────────────────────────────────
 
         /// <param name="logger">Application logger.</param>
@@ -49,19 +81,110 @@ namespace HC_APTBS.Services.Impl
             _log = logger;
         }
 
+        // ── IKwpService: session lifecycle ────────────────────────────────────────
+
+        /// <inheritdoc/>
+        public async Task ConnectAsync(string port, CancellationToken ct = default)
+        {
+            if (_kLineState == KLineConnectionState.Connected)
+                throw new InvalidOperationException("K-Line session is already active. Disconnect first.");
+
+            await Task.Run(() =>
+            {
+                Report(10, "Connecting to K-Line interface...");
+                var iface = new FtdiInterface(port, KLineBaudRate);
+                try
+                {
+                    ct.ThrowIfCancellationRequested();
+                    var kwpCommon = new KwpCommon(iface);
+                    kwpCommon.WakeUp(EcuInitAddress);
+                    var kwp = new KW1281Connection(kwpCommon);
+
+                    Report(50, "Reading ECU identification...");
+                    kwp.ReadEcuInfo();
+
+                    // Store session objects.
+                    _sessionIface = iface;
+                    _sessionKwpCommon = kwpCommon;
+                    _sessionKwp = kwp;
+                    _connectedPort = port;
+
+                    Report(100, "K-Line session established.");
+                    _log.Info(LogId, $"Persistent session opened on {port}");
+                }
+                catch
+                {
+                    iface.Dispose();
+                    throw;
+                }
+            }, ct);
+
+            SetState(KLineConnectionState.Connected);
+            StartKeepAlive();
+        }
+
+        /// <inheritdoc/>
+        public void Disconnect()
+        {
+            StopKeepAlive();
+
+            _busLock.Wait();
+            try
+            {
+                if (_sessionKwp != null)
+                {
+                    try { _sessionKwp.EndCommunication(); }
+                    catch (Exception ex) { _log.Warning(LogId, $"EndCommunication on disconnect: {ex.Message}"); }
+                }
+                CleanupSession();
+            }
+            finally
+            {
+                _busLock.Release();
+            }
+
+            SetState(KLineConnectionState.Disconnected);
+            _log.Info(LogId, "Persistent session disconnected.");
+        }
+
+        /// <inheritdoc/>
+        public void Dispose()
+        {
+            StopKeepAlive();
+            CleanupSession();
+            _busLock.Dispose();
+        }
+
         // ── IKwpService: full read ────────────────────────────────────────────────
 
         /// <inheritdoc/>
         public async Task<Dictionary<string, string>> ReadAllInfoAsync(
             string port, int pumpVersion, CancellationToken ct = default)
         {
-            return await Task.Run(() => ReadAllInfo(port, pumpVersion, ct), ct);
+            // If a persistent session is already active, reuse it —
+            // skip the slow WakeUp + ReadEcuInfo and keep the session alive afterward.
+            if (_kLineState == KLineConnectionState.Connected)
+                return await Task.Run(() => ReadAllInfoWithSession(pumpVersion, ct), ct);
+
+            var result = await Task.Run(() => ReadAllInfo(port, pumpVersion, ct), ct);
+
+            // On a successful fresh read, promote the transient session to a
+            // persistent one and start the keep-alive loop so the indicator
+            // turns green and subsequent operations can reuse the connection.
+            if (_sessionKwp != null)
+            {
+                SetState(KLineConnectionState.Connected);
+                StartKeepAlive();
+            }
+
+            return result;
         }
 
         private Dictionary<string, string> ReadAllInfo(string port, int pumpVersion, CancellationToken ct)
         {
             var result = new Dictionary<string, string> { [KlineKeys.Result] = "0" };
             FtdiInterface? iface = null;
+            bool promoteSession = false;
 
             try
             {
@@ -91,21 +214,54 @@ namespace HC_APTBS.Services.Impl
                 if (text.Length > 40) result[KlineKeys.SwVersion2]  = SafeSubstring(text, 32, 10).Trim();
                 if (text.Length > 50) result[KlineKeys.PumpControl] = SafeSubstring(text, 42, 10).Trim();
 
-                // Read diagnostic trouble codes.
-                kwp.KeepAlive();
-                Report(30, "Reading fault codes...");
-                var faultCodes = kwp.ReadFaultCodes();
-                result[KlineKeys.Errors] = faultCodes.Count > 0
-                    ? string.Join(Environment.NewLine, faultCodes)
-                    : KlineKeys.NoErrors;
-
                 ct.ThrowIfCancellationRequested();
 
                 // Unlock EEPROM for the given pump variant.
                 if (pumpVersion == 2)
                     kwp.SendCustom(new List<byte> { 0x18, 0x00, 0x01, 0x53, 0x72 });
 
-                Report(40, "Reading DFI calibration value...");
+                // Version-specific session unlock — moved before ROM reads so the
+                // pump identifier can be obtained as early as possible.
+                kwp.KeepAlive();
+                switch (pumpVersion)
+                {
+                    case 0: kwp.SendCustom(new List<byte> { 0x18, 0x00, 0x00, 0x82, 0x33 }); break;
+                    case 1: kwp.SendCustom(new List<byte> { 0x18, 0x00, 0x01, 0x72, 0x53 }); break;
+                    case 2: kwp.SendCustom(new List<byte> { 0x18, 0x00, 0x01, 0x53, 0x72 }); break;
+                }
+
+                // Read the ROM base address once (0xC6 command). Both the pump
+                // identifier and the V2 customer-change index derive from it.
+                Report(40, "Reading pump identifier...");
+                kwp.KeepAlive();
+                ushort baseAddr = ReadBaseRomAddress(kwp);
+                ushort identAddr = (ushort)(baseAddr >= 10 ? baseAddr - 10 : 0);
+                string ident = identAddr != 0 ? ReadRomString(kwp, identAddr, 10) : string.Empty;
+                result[KlineKeys.PumpId] = ident;
+
+                // Notify subscribers immediately so the pump definition and its
+                // tests can start loading while the K-Line read continues.
+                if (!string.IsNullOrEmpty(ident))
+                    PumpIdentified?.Invoke(ident);
+
+                Report(55, "Reading customer change index...");
+                kwp.KeepAlive();
+                ushort custChangeAddr;
+                if (pumpVersion == 2)
+                {
+                    // Reuse the base address from the 0xC6 response.
+                    custChangeAddr = (ushort)(baseAddr >= 0x1D ? baseAddr - 0x1D : 0);
+                }
+                else
+                {
+                    custChangeAddr = ReadCustomerChangeAddressNonV2(kwp);
+                }
+                string custChangeIndex = custChangeAddr != 0
+                    ? ReadRomString(kwp, custChangeAddr, 6)
+                    : string.Empty;
+                result[KlineKeys.ModelIndex] = custChangeIndex;
+
+                Report(65, "Reading DFI calibration value...");
                 kwp.KeepAlive();
                 kwp.SendCustom(new List<byte> { 0x18, 0x00, 0x03, 0xFF, 0xFF });
                 kwp.KeepAlive();
@@ -121,35 +277,23 @@ namespace HC_APTBS.Services.Impl
                 }
                 result[KlineKeys.Dfi] = dfi.ToString(System.Globalization.CultureInfo.InvariantCulture);
 
-                // Version-specific session unlock.
-                kwp.KeepAlive();
-                switch (pumpVersion)
-                {
-                    case 0: kwp.SendCustom(new List<byte> { 0x18, 0x00, 0x00, 0x82, 0x33 }); break;
-                    case 1: kwp.SendCustom(new List<byte> { 0x18, 0x00, 0x01, 0x72, 0x53 }); break;
-                    case 2: kwp.SendCustom(new List<byte> { 0x18, 0x00, 0x01, 0x53, 0x72 }); break;
-                }
+                // Notify subscribers so the DFI slider updates in real time.
+                DfiRead?.Invoke(dfi);
 
-                Report(60, "Reading customer change index...");
-                kwp.KeepAlive();
-                ushort custChangeAddr = ReadCustomerChangeAddress(kwp, pumpVersion);
-                string custChangeIndex = ReadRomString(kwp, custChangeAddr, 6);
-
-                Report(80, "Reading pump identifier...");
-                kwp.KeepAlive();
-                ushort identAddr = ReadIdentAddress(kwp);
-                string ident = identAddr != 0 ? ReadRomString(kwp, identAddr, 10) : string.Empty;
-
-                Report(90, "Reading serial number...");
+                Report(75, "Reading serial number...");
                 kwp.KeepAlive();
                 // EEPROM 0x0080, 6 bytes = ASCII serial number
                 string serial = ReadEepromString(kwp, new List<byte> { 0x19, 0x06, 0x00, 0x80 });
-
-                result[KlineKeys.PumpId]      = ident;
                 result[KlineKeys.SerialNumber] = serial;
-                result[KlineKeys.ModelIndex]  = custChangeIndex;
 
-                Report(95, "Enabling signal and closing session...");
+                Report(85, "Reading fault codes...");
+                kwp.KeepAlive();
+                var faultCodes = kwp.ReadFaultCodes();
+                result[KlineKeys.Errors] = faultCodes.Count > 0
+                    ? string.Join(Environment.NewLine, faultCodes)
+                    : KlineKeys.NoErrors;
+
+                Report(90, "Enabling signal...");
                 kwp.KeepAlive();
                 kwp.SendCustom(new List<byte> { 0x00 });
                 if (pumpVersion != 2)
@@ -163,9 +307,17 @@ namespace HC_APTBS.Services.Impl
                     for (int i = 0; i < 10; i++) kwp.KeepAlive();
                 }
                 kwp.KeepAlive();
-                kwp.EndCommunication();
+
+                // Promote the connection to a persistent session instead of
+                // closing it. The caller starts the keep-alive loop afterward.
+                _sessionIface = iface;
+                _sessionKwpCommon = kwpCommon;
+                _sessionKwp = kwp;
+                _connectedPort = port;
+                promoteSession = true;
 
                 result[KlineKeys.Result] = "1";
+                _log.Info(LogId, $"ReadAllInfo complete — session promoted to persistent on {port}");
             }
             catch (OperationCanceledException)
             {
@@ -178,7 +330,130 @@ namespace HC_APTBS.Services.Impl
             }
             finally
             {
-                iface?.Dispose();
+                // Only dispose if we did NOT promote the session.
+                if (!promoteSession)
+                    iface?.Dispose();
+            }
+
+            return result;
+        }
+
+        /// <summary>
+        /// Session-aware variant of <see cref="ReadAllInfo"/>. Reuses the persistent
+        /// K-Line session, skipping WakeUp and ReadEcuInfo. The session stays alive
+        /// afterward (no EndCommunication).
+        /// </summary>
+        private Dictionary<string, string> ReadAllInfoWithSession(int pumpVersion, CancellationToken ct)
+        {
+            var result = new Dictionary<string, string> { [KlineKeys.Result] = "0" };
+
+            _busLock.Wait(ct);
+            try
+            {
+                var kwp = _sessionKwp!;
+
+                Report(20, "Reading pump data (session active)...");
+                ct.ThrowIfCancellationRequested();
+
+                // Unlock EEPROM for the given pump variant.
+                if (pumpVersion == 2)
+                    kwp.SendCustom(new List<byte> { 0x18, 0x00, 0x01, 0x53, 0x72 });
+
+                // Version-specific session unlock.
+                kwp.KeepAlive();
+                switch (pumpVersion)
+                {
+                    case 0: kwp.SendCustom(new List<byte> { 0x18, 0x00, 0x00, 0x82, 0x33 }); break;
+                    case 1: kwp.SendCustom(new List<byte> { 0x18, 0x00, 0x01, 0x72, 0x53 }); break;
+                    case 2: kwp.SendCustom(new List<byte> { 0x18, 0x00, 0x01, 0x53, 0x72 }); break;
+                }
+
+                // Read the ROM base address once (0xC6 command).
+                Report(40, "Reading pump identifier...");
+                kwp.KeepAlive();
+                ushort baseAddr = ReadBaseRomAddress(kwp);
+                ushort identAddr = (ushort)(baseAddr >= 10 ? baseAddr - 10 : 0);
+                string ident = identAddr != 0 ? ReadRomString(kwp, identAddr, 10) : string.Empty;
+                result[KlineKeys.PumpId] = ident;
+
+                if (!string.IsNullOrEmpty(ident))
+                    PumpIdentified?.Invoke(ident);
+
+                Report(55, "Reading customer change index...");
+                kwp.KeepAlive();
+                ushort custChangeAddr;
+                if (pumpVersion == 2)
+                {
+                    custChangeAddr = (ushort)(baseAddr >= 0x1D ? baseAddr - 0x1D : 0);
+                }
+                else
+                {
+                    custChangeAddr = ReadCustomerChangeAddressNonV2(kwp);
+                }
+                string custChangeIndex = custChangeAddr != 0
+                    ? ReadRomString(kwp, custChangeAddr, 6)
+                    : string.Empty;
+                result[KlineKeys.ModelIndex] = custChangeIndex;
+
+                Report(65, "Reading DFI calibration value...");
+                kwp.KeepAlive();
+                kwp.SendCustom(new List<byte> { 0x18, 0x00, 0x03, 0xFF, 0xFF });
+                kwp.KeepAlive();
+
+                var dfiPackets = kwp.SendCustom(new List<byte> { 0x19, 0x02, 0x00, 0x44 });
+                double dfi = 0;
+                foreach (var pkt in dfiPackets)
+                {
+                    if (pkt is ReadEepromResponsePacket && pkt.Body.Count > 0)
+                    { dfi = ((sbyte)pkt.Body[0] * 3.0) / 256.0; break; }
+                }
+                result[KlineKeys.Dfi] = dfi.ToString(System.Globalization.CultureInfo.InvariantCulture);
+                DfiRead?.Invoke(dfi);
+
+                Report(75, "Reading serial number...");
+                kwp.KeepAlive();
+                string serial = ReadEepromString(kwp, new List<byte> { 0x19, 0x06, 0x00, 0x80 });
+                result[KlineKeys.SerialNumber] = serial;
+
+                Report(85, "Reading fault codes...");
+                kwp.KeepAlive();
+                var faultCodes = kwp.ReadFaultCodes();
+                result[KlineKeys.Errors] = faultCodes.Count > 0
+                    ? string.Join(Environment.NewLine, faultCodes)
+                    : KlineKeys.NoErrors;
+
+                Report(90, "Enabling signal...");
+                kwp.KeepAlive();
+                kwp.SendCustom(new List<byte> { 0x00 });
+                if (pumpVersion != 2)
+                {
+                    kwp.SendCustom(new List<byte> { 0x02, 0x88, 0x01, 0x04, 0x06, 0x01 });
+                }
+                else
+                {
+                    kwp.SendCustom(new List<byte> { 0x02, 0x55, 0x01, 0x04, 0x06, 0x01 });
+                    kwp.SendCustom(new List<byte> { 0x01, 0x02, 0x00, 0xC6 });
+                    for (int i = 0; i < 10; i++) kwp.KeepAlive();
+                }
+                kwp.KeepAlive();
+                // No EndCommunication — keep session alive.
+
+                result[KlineKeys.Result] = "1";
+            }
+            catch (OperationCanceledException)
+            {
+                result[KlineKeys.ConnectError] = "Cancelled";
+            }
+            catch (Exception ex)
+            {
+                result[KlineKeys.ConnectError] = ex.Message;
+                _log.Error(LogId, $"ReadAllInfo (session): {ex}");
+                CleanupSession();
+                SetState(KLineConnectionState.Failed);
+            }
+            finally
+            {
+                _busLock.Release();
             }
 
             return result;
@@ -189,6 +464,9 @@ namespace HC_APTBS.Services.Impl
         /// <inheritdoc/>
         public async Task<string> ReadFaultCodesAsync(string port, CancellationToken ct = default)
         {
+            if (_kLineState == KLineConnectionState.Connected)
+                return await Task.Run(() => ReadFaultCodesWithSession(ct), ct);
+
             return await Task.Run(() =>
             {
                 FtdiInterface? iface = null;
@@ -222,6 +500,9 @@ namespace HC_APTBS.Services.Impl
         /// <inheritdoc/>
         public async Task<string> ClearFaultCodesAsync(string port, CancellationToken ct = default)
         {
+            if (_kLineState == KLineConnectionState.Connected)
+                return await Task.Run(() => ClearFaultCodesWithSession(ct), ct);
+
             return await Task.Run(() =>
             {
                 FtdiInterface? iface = null;
@@ -259,6 +540,9 @@ namespace HC_APTBS.Services.Impl
         /// <inheritdoc/>
         public async Task<string> ReadDfiAsync(string port, CancellationToken ct = default)
         {
+            if (_kLineState == KLineConnectionState.Connected)
+                return await Task.Run(() => ReadDfiWithSession(ct), ct);
+
             return await Task.Run(() =>
             {
                 FtdiInterface? iface = null;
@@ -297,13 +581,27 @@ namespace HC_APTBS.Services.Impl
         /// <inheritdoc/>
         public async Task<string> WriteDfiAsync(string port, float dfi, int version, CancellationToken ct = default)
         {
+            if (_kLineState == KLineConnectionState.Connected)
+                return await Task.Run(() => WriteDfiWithSession(dfi, version, ct), ct);
+
             return await Task.Run(() => WriteDfiInternal(port, dfi, version, closeSession: true), ct);
         }
 
         /// <inheritdoc/>
         public async Task<string> WriteDfiAndRestartAsync(string port, float dfi, int version, CancellationToken ct = default)
         {
-            var result = await Task.Run(() => WriteDfiInternal(port, dfi, version, closeSession: true), ct);
+            string result;
+            if (_kLineState == KLineConnectionState.Connected)
+            {
+                result = await Task.Run(() => WriteDfiWithSession(dfi, version, ct), ct);
+                // Pump power will be cycled — the session is dead after this.
+                Disconnect();
+            }
+            else
+            {
+                result = await Task.Run(() => WriteDfiInternal(port, dfi, version, closeSession: true), ct);
+            }
+
             PumpDisconnectRequested?.Invoke();
             await Task.Delay(1000, ct);
             PumpReconnectRequested?.Invoke();
@@ -333,6 +631,204 @@ namespace HC_APTBS.Services.Impl
             }
         }
 
+        // ── Keep-alive loop ───────────────────────────────────────────────────────
+
+        private void StartKeepAlive()
+        {
+            _keepAliveCts = new CancellationTokenSource();
+            _keepAliveTask = Task.Run(() => KeepAliveLoop(_keepAliveCts.Token));
+        }
+
+        private void StopKeepAlive()
+        {
+            if (_keepAliveCts == null) return;
+            _keepAliveCts.Cancel();
+            try { _keepAliveTask?.Wait(); } catch (AggregateException) { }
+            _keepAliveCts.Dispose();
+            _keepAliveCts = null;
+            _keepAliveTask = null;
+        }
+
+        private async Task KeepAliveLoop(CancellationToken ct)
+        {
+            while (!ct.IsCancellationRequested)
+            {
+                try
+                {
+                    await Task.Delay(KeepAliveIntervalMs, ct);
+                }
+                catch (OperationCanceledException) { return; }
+
+                // Non-blocking try-acquire: if an operation holds the lock
+                // we skip this cycle — the operation itself keeps the bus alive.
+                if (!await _busLock.WaitAsync(0, ct))
+                    continue;
+
+                try
+                {
+                    _sessionKwp!.KeepAlive();
+                }
+                catch (OperationCanceledException) { return; }
+                catch (Exception ex)
+                {
+                    _log.Error(LogId, $"Keep-alive failed: {ex.Message}");
+                    CleanupSession();
+                    SetState(KLineConnectionState.Failed);
+                    return;
+                }
+                finally
+                {
+                    _busLock.Release();
+                }
+            }
+        }
+
+        // ── Session state helpers ─────────────────────────────────────────────────
+
+        private void SetState(KLineConnectionState newState)
+        {
+            if (_kLineState == newState) return;
+            _kLineState = newState;
+            KLineStateChanged?.Invoke(newState);
+        }
+
+        private void CleanupSession()
+        {
+            _sessionIface?.Dispose();
+            _sessionIface = null;
+            _sessionKwpCommon = null;
+            _sessionKwp = null;
+            _connectedPort = null;
+        }
+
+        // ── Session-aware operation helpers ────────────────────────────────────────
+
+        private string ReadFaultCodesWithSession(CancellationToken ct)
+        {
+            _busLock.Wait(ct);
+            try
+            {
+                Report(50, "Reading fault codes...");
+                _sessionKwp!.KeepAlive();
+                var codes = _sessionKwp.ReadFaultCodes();
+                _sessionKwp.KeepAlive();
+                Report(100, "Done.");
+                return codes.Count > 0
+                    ? string.Join(Environment.NewLine, codes)
+                    : KlineKeys.NoErrors;
+            }
+            catch (Exception ex)
+            {
+                _log.Error(LogId, $"ReadFaultCodes (session): {ex.Message}");
+                CleanupSession();
+                SetState(KLineConnectionState.Failed);
+                return $"Error: {ex.Message}";
+            }
+            finally { _busLock.Release(); }
+        }
+
+        private string ClearFaultCodesWithSession(CancellationToken ct)
+        {
+            _busLock.Wait(ct);
+            try
+            {
+                Report(40, "Clearing fault codes...");
+                _sessionKwp!.KeepAlive();
+                _sessionKwp.ClearFaultCodes();
+                _sessionKwp.KeepAlive();
+                Report(70, "Reading fault codes...");
+                var codes = _sessionKwp.ReadFaultCodes();
+                _sessionKwp.KeepAlive();
+                Report(100, "Done.");
+                return codes.Count > 0
+                    ? string.Join(Environment.NewLine, codes)
+                    : KlineKeys.NoErrors;
+            }
+            catch (Exception ex)
+            {
+                _log.Error(LogId, $"ClearFaultCodes (session): {ex.Message}");
+                CleanupSession();
+                SetState(KLineConnectionState.Failed);
+                return $"Error: {ex.Message}";
+            }
+            finally { _busLock.Release(); }
+        }
+
+        private string ReadDfiWithSession(CancellationToken ct)
+        {
+            _busLock.Wait(ct);
+            try
+            {
+                Report(30, "Reading DFI calibration...");
+                _sessionKwp!.KeepAlive();
+                _sessionKwp.SendCustom(new List<byte> { 0x18, 0x00, 0x03, 0xFF, 0xFF });
+                _sessionKwp.KeepAlive();
+                var packets = _sessionKwp.SendCustom(new List<byte> { 0x19, 0x02, 0x00, 0x44 });
+                double dfi = 0;
+                foreach (var pkt in packets)
+                    if (pkt is ReadEepromResponsePacket && pkt.Body.Count > 0)
+                    { dfi = ((sbyte)pkt.Body[0] * 3.0) / 256.0; break; }
+                _sessionKwp.KeepAlive();
+                Report(100, "Done.");
+                return dfi.ToString(System.Globalization.CultureInfo.InvariantCulture);
+            }
+            catch (Exception ex)
+            {
+                _log.Error(LogId, $"ReadDfi (session): {ex.Message}");
+                CleanupSession();
+                SetState(KLineConnectionState.Failed);
+                return "0";
+            }
+            finally { _busLock.Release(); }
+        }
+
+        private string WriteDfiWithSession(float dfi, int version, CancellationToken ct)
+        {
+            _busLock.Wait(ct);
+            double newDfi = 0;
+            try
+            {
+                var passPacket = version switch
+                {
+                    1 => new List<byte> { 0x18, 0x00, 0x03, 0x2F, 0xFF, 0x30, 0x35, 0x30, 0x30, 0x30, 0x31, 0x1C, 0x09, 0x04 },
+                    2 or 3 => new List<byte> { 0x18, 0x00, 0x03, 0xFF, 0xF2, 0x4B, 0x48, 0x54, 0x43, 0x41, 0x38, 0x47, 0x30, 0x45 },
+                    _ => new List<byte> { 0x18, 0x00, 0x03, 0x2F, 0xFF, 0x4B, 0x48, 0x54, 0x43, 0x41, 0x38, 0x47, 0x30, 0x45 }
+                };
+
+                Report(30, "Authenticating and writing DFI...");
+                _sessionKwp!.KeepAlive();
+                _sessionKwp.SendCustom(passPacket);
+                _sessionKwp.KeepAlive();
+
+                sbyte rawValue = (sbyte)((dfi * 256.0f) / 3.0f);
+                if (rawValue == 0) rawValue = 1;
+                byte checksum = (byte)(0 - (byte)rawValue);
+
+                _sessionKwp.SendCustom(new List<byte> { 0x1A, 0x02, 0x00, 0x44, (byte)rawValue, checksum, 0x03 });
+                _sessionKwp.KeepAlive();
+
+                Report(60, "Verifying write...");
+                _sessionKwp.SendCustom(new List<byte> { 0x18, 0x00, 0x03, 0xFF, 0xFF });
+                _sessionKwp.KeepAlive();
+                var packets = _sessionKwp.SendCustom(new List<byte> { 0x19, 0x02, 0x00, 0x44 });
+                foreach (var pkt in packets)
+                    if (pkt is ReadEepromResponsePacket && pkt.Body.Count > 0)
+                    { newDfi = ((sbyte)pkt.Body[0] * 3.0) / 256.0; break; }
+
+                _sessionKwp.KeepAlive();
+                Report(100, "Done.");
+            }
+            catch (Exception ex)
+            {
+                _log.Error(LogId, $"WriteDfi (session): {ex.Message}");
+                CleanupSession();
+                SetState(KLineConnectionState.Failed);
+            }
+            finally { _busLock.Release(); }
+
+            return newDfi.ToString(System.Globalization.CultureInfo.InvariantCulture);
+        }
+
         // ── Private helpers ───────────────────────────────────────────────────────
 
         private string WriteDfiInternal(string port, float dfi, int version, bool closeSession)
@@ -399,33 +895,31 @@ namespace HC_APTBS.Services.Impl
             return newDfi.ToString(System.Globalization.CultureInfo.InvariantCulture);
         }
 
-        private ushort ReadCustomerChangeAddress(KW1281Connection kwp, int pumpVersion)
-        {
-            if (pumpVersion == 2)
-            {
-                var packets = kwp.SendCustom(new List<byte> { 0x01, 0x02, 0x00, 0xC6 });
-                foreach (var pkt in packets)
-                    if (pkt.Body.Count > 1)
-                        return (ushort)(((pkt.Body[1] << 8) | pkt.Body[0]) - 0x1D);
-                return 0;
-            }
-            else
-            {
-                var data = kwp.ReadRomEeprom(0x9FFE, 2);
-                if (data == null || data.Count < 2) return 0;
-                return (ushort)(((data[1] << 8) | data[0]) + 3);
-            }
-        }
-
-        private ushort ReadIdentAddress(KW1281Connection kwp)
+        /// <summary>
+        /// Sends the ROM address lookup command {0x01, 0x02, 0x00, 0xC6} once and
+        /// returns the raw 16-bit base address. Both the pump identifier (base − 10)
+        /// and the V2 customer-change index (base − 0x1D) derive from this value.
+        /// </summary>
+        private ushort ReadBaseRomAddress(KW1281Connection kwp)
         {
             var packets = kwp.SendCustom(new List<byte> { 0x01, 0x02, 0x00, 0xC6 });
             foreach (var pkt in packets)
                 if (pkt.Body.Count > 1)
-                    return (ushort)(((pkt.Body[1] << 8) | pkt.Body[0]) - 10);
+                    return (ushort)((pkt.Body[1] << 8) | pkt.Body[0]);
             return 0;
         }
 
+        /// <summary>
+        /// Reads the customer-change ROM address for non-V2 pumps using
+        /// the legacy ROM pointer at 0x9FFE.
+        /// </summary>
+        private ushort ReadCustomerChangeAddressNonV2(KW1281Connection kwp)
+        {
+            var data = kwp.ReadRomEeprom(0x9FFE, 2);
+            if (data == null || data.Count < 2) return 0;
+            return (ushort)(((data[1] << 8) | data[0]) + 3);
+        }
+
         private string ReadRomString(KW1281Connection kwp, ushort address, byte count)
         {
             var data = kwp.ReadRomEeprom(address, count);

ViewModels/DfiManageViewModel.cs

@@ -31,6 +31,10 @@ namespace HC_APTBS.ViewModels
         {
             _kwp    = kwpService;
             _config = configService;
+
+            // Update the slider and LCD display in real time when the DFI is
+            // read during a full K-Line read (PumpIdentificationViewModel flow).
+            _kwp.DfiRead += (dfi) => SetDfi(dfi);
         }
 
         // ── DFI display ───────────────────────────────────────────────────────────

ViewModels/MainViewModel.cs

@@ -34,6 +34,7 @@ namespace HC_APTBS.ViewModels
         // ── Services ──────────────────────────────────────────────────────────────
 
         private readonly ICanService _can;
+        private readonly IKwpService _kwp;
         private readonly IBenchService _bench;
         private readonly IConfigurationService _config;
         private readonly IPdfService _pdf;
@@ -96,6 +97,7 @@ namespace HC_APTBS.ViewModels
             IAppLogger logger)
         {
             _can    = canService;
+            _kwp    = kwpService;
             _bench  = benchService;
             _config = configService;
             _pdf    = pdfService;
@@ -129,6 +131,10 @@ namespace HC_APTBS.ViewModels
             _can.PumpLivenessChanged += alive =>
                 App.Current.Dispatcher.Invoke(() => IsPumpConnected = alive);
 
+            // K-Line session state → indicator
+            _kwp.KLineStateChanged += state =>
+                App.Current.Dispatcher.Invoke(() => KLineState = state);
+
             // Bench service events
             _bench.TestStarted    += OnTestStarted;
             _bench.TestFinished   += OnTestFinished;
@@ -276,15 +282,21 @@ namespace HC_APTBS.ViewModels
         /// <summary>Auxiliary temperature T4 (°C).</summary>
         [ObservableProperty] private double _temp4;
 
+        /// <summary>Oil tank temperature (°C).</summary>
+        [ObservableProperty] private double _benchTemp;
+
         /// <summary>Fuel delivery measurement Q-delivery (cc/stroke).</summary>
         [ObservableProperty] private double _qDelivery;
 
         /// <summary>Fuel overflow/pilot measurement Q-over (cc/stroke).</summary>
         [ObservableProperty] private double _qOver;
 
-        /// <summary>Bench oil pressure (bar).</summary>
+        /// <summary>Bench oil pressure P1 (bar), sensor-calibrated.</summary>
         [ObservableProperty] private double _pressure;
 
+        /// <summary>Analogue sensor 2 pressure P2 (bar), sensor-calibrated.</summary>
+        [ObservableProperty] private double _pressure2;
+
         /// <summary>PSG encoder position value.</summary>
         [ObservableProperty] private double _psgEncoderValue;
 
@@ -316,8 +328,8 @@ namespace HC_APTBS.ViewModels
         /// <summary>True when oil circulation has been detected.</summary>
         [ObservableProperty] private bool _isOilCirculating;
 
-        /// <summary>True when a K-Line session is active.</summary>
-        [ObservableProperty] private bool _isKLineConnected;
+        /// <summary>Current K-Line session state (Disconnected / Connected / Failed).</summary>
+        [ObservableProperty] private KLineConnectionState _kLineState = KLineConnectionState.Disconnected;
 
         // ── Test status ───────────────────────────────────────────────────────────
 
@@ -500,11 +512,17 @@ namespace HC_APTBS.ViewModels
             TempIn          = _bench.ReadBenchParameter(BenchParameterNames.TempIn);
             TempOut         = _bench.ReadBenchParameter(BenchParameterNames.TempOut);
             Temp4           = _bench.ReadBenchParameter(BenchParameterNames.Temp4);
+            BenchTemp       = _bench.ReadBenchParameter(BenchParameterNames.Temp);
             QDelivery       = _bench.ReadBenchParameter(BenchParameterNames.QDelivery);
             QOver           = _bench.ReadBenchParameter(BenchParameterNames.QOver);
-            Pressure        = _bench.ReadBenchParameter(BenchParameterNames.Pressure);
             PsgEncoderValue = _bench.ReadBenchParameter(BenchParameterNames.PsgEncoderValue);
 
+            // Apply analogue sensor calibration for pressure channels.
+            double rawP1 = _bench.ReadBenchParameter(BenchParameterNames.Pressure);
+            Pressure  = _config.Settings.Sensors.TryGetValue(1, out var s1) ? s1.GetValueFromRaw(rawP1) : rawP1;
+            double rawP2 = _bench.ReadBenchParameter(BenchParameterNames.AnalogSensor2);
+            Pressure2 = _config.Settings.Sensors.TryGetValue(2, out var s2) ? s2.GetValueFromRaw(rawP2) : rawP2;
+
             // Feed the angle display with all three encoder channels + status.
             AngleDisplay.Update(
                 PsgEncoderValue,

ViewModels/PumpIdentificationViewModel.cs

@@ -47,6 +47,18 @@ namespace HC_APTBS.ViewModels
                 ProgressPercent = pct;
                 ProgressMessage = msg;
             });
+
+            // Start loading the pump as soon as the identifier is read from ROM,
+            // before the full K-Line read completes.
+            _kwp.PumpIdentified += (pumpId) => App.Current.Dispatcher.Invoke(() =>
+            {
+                KlinePumpId = pumpId;
+                AutoSelectPumpByKlineId(pumpId);
+            });
+
+            // Track K-Line session state for Disconnect button enable/disable.
+            _kwp.KLineStateChanged += state =>
+                App.Current.Dispatcher.Invoke(() => KLineState = state);
         }
 
         // ── Pump selection ────────────────────────────────────────────────────────
@@ -106,8 +118,14 @@ namespace HC_APTBS.ViewModels
         /// <summary>True while a K-Line read is in progress.</summary>
         [ObservableProperty]
         [NotifyCanExecuteChangedFor(nameof(ReadKlineCommand))]
+        [NotifyCanExecuteChangedFor(nameof(DisconnectKLineCommand))]
         private bool _isReading;
 
+        /// <summary>Current K-Line session state for Disconnect button enable/disable.</summary>
+        [ObservableProperty]
+        [NotifyCanExecuteChangedFor(nameof(DisconnectKLineCommand))]
+        private KLineConnectionState _kLineState = KLineConnectionState.Disconnected;
+
         /// <summary>DFI calibration angle read from ECU EEPROM.</summary>
         [ObservableProperty] private string _klineDfi          = "-";
 
@@ -182,7 +200,10 @@ namespace HC_APTBS.ViewModels
                 {
                     KlineDfi          = dfi          ?? "-";
                     KlineErrors       = errors        ?? string.Empty;
-                    KlinePumpId       = pumpId        ?? string.Empty;
+                    // Preserve the value set by the PumpIdentified event if the
+                    // dictionary entry is empty (e.g. read failed after ident).
+                    if (!string.IsNullOrEmpty(pumpId))
+                        KlinePumpId   = pumpId;
                     KlineSerialNumber = serial        ?? string.Empty;
                     KlineModelRef     = modelRef      ?? string.Empty;
                     KlineModelIndex   = modelIndex    ?? string.Empty;
@@ -193,12 +214,8 @@ namespace HC_APTBS.ViewModels
                     KlineConnectError = connectErr    ?? string.Empty;
                 });
 
-                // Auto-select pump from K-Line pump ID — matches old source behaviour
-                // where OnPumpConnectClick would call LoadPump(pumpId) after reading.
-                if (result == "1" && !string.IsNullOrEmpty(pumpId))
-                {
-                    AutoSelectPumpByKlineId(pumpId);
-                }
+                // Pump auto-selection now happens via the PumpIdentified event
+                // mid-read, so there is no need to call AutoSelectPumpByKlineId here.
 
                 // Attach K-Line info to the (now possibly auto-selected) pump.
                 if (CurrentPump != null)
@@ -212,6 +229,22 @@ namespace HC_APTBS.ViewModels
 
         private bool CanReadKline() => !IsReading;
 
+        /// <summary>Closes the persistent K-Line session.</summary>
+        [RelayCommand(CanExecute = nameof(CanDisconnectKLine))]
+        private void DisconnectKLine()
+        {
+            try
+            {
+                _kwp.Disconnect();
+            }
+            catch (Exception ex)
+            {
+                _log.Error(LogId, $"DisconnectKLine: {ex.Message}");
+            }
+        }
+
+        private bool CanDisconnectKLine() => !IsReading && KLineState == KLineConnectionState.Connected;
+
         // ── Helpers ───────────────────────────────────────────────────────────────
 
         /// <summary>

ViewModels/SingleFlowChartViewModel.cs

@@ -23,6 +23,9 @@ namespace HC_APTBS.ViewModels
         /// <summary>Chart title label.</summary>
         [ObservableProperty] private string _title = string.Empty;
 
+        /// <summary>Most recent sample value, displayed as a numeric label alongside the chart.</summary>
+        [ObservableProperty] private double _currentValue;
+
         /// <summary>Series array bound to the CartesianChart.</summary>
         public ISeries[] Series { get; }
 
@@ -88,6 +91,7 @@ namespace HC_APTBS.ViewModels
         public void AddValue(double value)
         {
             _values.Add(value);
+            CurrentValue = value;
             if (_values.Count > _maxSamples)
                 _values.RemoveAt(0);
         }

ViewModels/StatusDisplayViewModel.cs

@@ -40,6 +40,9 @@ namespace HC_APTBS.ViewModels
             get => _isActive;
             set => SetProperty(ref _isActive, value);
         }
+
+        /// <summary>Zero-based bit position (0–15) shown as a label beneath the indicator.</summary>
+        public int Index { get; init; }
     }
 
     /// <summary>
@@ -73,7 +76,7 @@ namespace HC_APTBS.ViewModels
         public StatusDisplayViewModel()
         {
             for (int i = 0; i < 16; i++)
-                Bits.Add(new BitIndicatorViewModel { Color = "#26C200", Description = $"Bit {i}" });
+                Bits.Add(new BitIndicatorViewModel { Color = "#26C200", Description = $"Bit {i}", Index = i });
         }
 
         // ── Public API ────────────────────────────────────────────────────────────

Views/UserControls/FlowmeterChartView.xaml

@@ -9,8 +9,13 @@
             <RowDefinition Height="*"/>
         </Grid.RowDefinitions>
 
-        <TextBlock Text="{Binding Title}" FontSize="11" FontWeight="SemiBold"
-                   Foreground="DimGray" Margin="4,0"/>
+        <StackPanel Orientation="Horizontal" Margin="4,0">
+            <TextBlock Text="{Binding Title}" FontSize="11" FontWeight="SemiBold"
+                       Foreground="DimGray"/>
+            <TextBlock Text="{Binding CurrentValue, StringFormat=F3}" FontSize="14" FontWeight="Bold"
+                       Foreground="#4080FF" FontFamily="Consolas" Margin="8,0,0,0"
+                       VerticalAlignment="Center"/>
+        </StackPanel>
 
         <lvc:CartesianChart Grid.Row="1" Height="120"
                             Series="{Binding Series}"

Views/UserControls/PumpIdentificationView.xaml

@@ -94,6 +94,8 @@
                 <StackPanel Grid.Column="1" VerticalAlignment="Center" Margin="6,0,0,0">
                     <Button Content="Read K-Line" Width="90" Margin="0,2"
                             Command="{Binding ReadKlineCommand}"/>
+                    <Button Content="Disconnect" Width="90" Margin="0,2"
+                            Command="{Binding DisconnectKLineCommand}"/>
                     <!-- Progress bar shown during K-Line read -->
                     <ProgressBar Value="{Binding ProgressPercent, Mode=OneWay}"
                                  Minimum="0" Maximum="100" Height="6"

Views/UserControls/StatusDisplayView.xaml

@@ -44,8 +44,11 @@
                                    Width="12" Height="12"
                                    HorizontalAlignment="Center" VerticalAlignment="Center"
                                    ToolTip="{Binding Description}"
+                                   ToolTipService.InitialShowDelay="150"
+                                   ToolTipService.ShowDuration="30000"
                                    SnapsToDevicePixels="True"/>
                         <TextBlock Grid.Row="1" FontSize="8"
+                                   Text="{Binding Index}"
                                    HorizontalAlignment="Center" VerticalAlignment="Center"
                                    Foreground="DimGray"/>
                     </Grid>