diff --git a/A11_F407_SDC_ACQ_DAC_CubeMX/Src/main.c b/A11_F407_SDC_ACQ_DAC_CubeMX/Src/main.c
index 63fa698..675a3d4 100644
--- a/A11_F407_SDC_ACQ_DAC_CubeMX/Src/main.c
+++ b/A11_F407_SDC_ACQ_DAC_CubeMX/Src/main.c
@@ -62,8 +62,10 @@ typedef struct
 
 #define GPIO_INPUT_MASK           0x7FFFU
 #define UART_LINE_SIZE            32U
-#define REPORT_PERIOD_MS          500U
-#define CAN_HEARTBEAT_PERIOD_MS   1000U
+#define ADC_REPORT_PERIOD_MS      500U
+#define PWM_REPORT_PERIOD_MS      20U
+#define CAN_HEARTBEAT_PERIOD_MS   100U
+#define DAC_CAN_TIMEOUT_MS        100U
 #define PWM_TIMEOUT_MS            1000U
 
 #define CAN_HEARTBEAT_STD_ID      0x6A0U
@@ -109,9 +111,12 @@ static uint16_t gpio_last_state;
 static volatile uint16_t gpio_shadow_state;
 static volatile uint16_t gpio_report_state;
 static volatile uint16_t gpio_pending_changed_mask;
-static uint32_t last_report_ms;
-static uint32_t last_heartbeat_ms;
-static uint32_t last_can_heartbeat_ms;
+static uint32_t last_adc_report_ms;
+static uint32_t last_pwm_report_ms;
+static uint32_t last_heartbeat_ms;
+static uint32_t last_can_heartbeat_ms;
+static uint32_t dac_can_last_command_ms[2];
+static bool dac_can_watchdog_active[2];
 static uint16_t can_heartbeat_sequence;
 static uint32_t adc_filter_history[ADC_FILTER_WINDOW];
 static uint32_t adc_filter_sum;
@@ -144,6 +149,7 @@ static void PollGpioChanges(void);
 static void SendPeriodicReport(void);
 static void ServiceHeartbeat(void);
 static void ServiceAssiLamp(void);
+static void ServiceDacCanWatchdog(void);
 static void SendCanHeartbeat(void);
 static void HandleAssiLampSetRequest(const char *source, uint8_t state);
 static void HandleTextCommand(const char *source, const char *line);
@@ -234,6 +240,7 @@ int main(void)
     PollUart();
     PollCanBus(&hcan1, "CAN1");
     PollCanBus(&hcan2, "CAN2");
+    ServiceDacCanWatchdog();
     ServiceAssiLamp();
     PollCaptureChannels();
     PollGpioChanges();
@@ -758,9 +765,14 @@ static void AppInit(void)
   gpio_shadow_state = gpio_last_state;
   gpio_report_state = gpio_last_state;
   gpio_pending_changed_mask = 0U;
-  last_report_ms = HAL_GetTick();
-  last_heartbeat_ms = last_report_ms;
-  last_can_heartbeat_ms = last_report_ms;
+  last_adc_report_ms = HAL_GetTick();
+  last_pwm_report_ms = last_adc_report_ms;
+  last_heartbeat_ms = last_adc_report_ms;
+  last_can_heartbeat_ms = last_adc_report_ms;
+  dac_can_last_command_ms[0] = 0U;
+  dac_can_last_command_ms[1] = 0U;
+  dac_can_watchdog_active[0] = false;
+  dac_can_watchdog_active[1] = false;
   can_heartbeat_sequence = 0U;
   adc_filter_sum = 0U;
   adc_filter_count = 0U;
@@ -826,10 +838,12 @@ static void PollCanBus(CAN_HandleTypeDef *hcan, const char *name)
 
     if (rx_header.StdId == CAN_DAC_CMD_STD_ID)
     {
-      if ((rx_header.DLC >= 3U) && (rx_data[0] >= 1U) && (rx_data[0] <= 2U))
-      {
-        uint16_t millivolts = (uint16_t)rx_data[1] | ((uint16_t)rx_data[2] << 8);
-        HandleDacSetRequest(name, rx_data[0], millivolts);
+      if ((rx_header.DLC >= 3U) && (rx_data[0] >= 1U) && (rx_data[0] <= 2U))
+      {
+        uint16_t millivolts = (uint16_t)rx_data[1] | ((uint16_t)rx_data[2] << 8);
+        HandleDacSetRequest(name, rx_data[0], millivolts);
+        dac_can_last_command_ms[rx_data[0] - 1U] = HAL_GetTick();
+        dac_can_watchdog_active[rx_data[0] - 1U] = true;
       }
       else
       {
@@ -918,12 +932,12 @@ static void SendPeriodicReport(void)
 {
   uint32_t now = HAL_GetTick();
 
-  if ((now - last_report_ms) >= REPORT_PERIOD_MS)
-  {
+  if ((now - last_adc_report_ms) >= ADC_REPORT_PERIOD_MS)
+  {
     uint32_t adc_mv = ReadAdcInputMillivolts();
     char line[160];
 
-    last_report_ms = now;
+    last_adc_report_ms = now;
 
     snprintf(line,
              sizeof(line),
@@ -933,11 +947,16 @@ static void SendPeriodicReport(void)
              (unsigned long)capture_channels[1].frequency_hz,
              (unsigned long)capture_channels[2].frequency_hz,
              (unsigned long)capture_channels[3].frequency_hz);
-    UartWrite(line);
-    BroadcastAdcReport(adc_mv);
-    BroadcastPwmReport();
-  }
-}
+    UartWrite(line);
+    BroadcastAdcReport(adc_mv);
+  }
+
+  if ((now - last_pwm_report_ms) >= PWM_REPORT_PERIOD_MS)
+  {
+    last_pwm_report_ms = now;
+    BroadcastPwmReport();
+  }
+}
 
 static void ServiceHeartbeat(void)
 {
@@ -987,6 +1006,24 @@ static void ServiceAssiLamp(void)
   HAL_GPIO_WritePin(GPIOE, GPIO_PIN_11, blue);
 }
 
+static void ServiceDacCanWatchdog(void)
+{
+  uint32_t now = HAL_GetTick();
+  uint8_t dac_id;
+
+  for (dac_id = 1U; dac_id <= 2U; dac_id++)
+  {
+    uint8_t index = dac_id - 1U;
+
+    if (dac_can_watchdog_active[index] &&
+        ((now - dac_can_last_command_ms[index]) >= DAC_CAN_TIMEOUT_MS))
+    {
+      (void)DacSetMillivolts(dac_id, 0U);
+      dac_can_watchdog_active[index] = false;
+    }
+  }
+}
+
 static void HandleAssiLampSetRequest(const char *source, uint8_t state)
 {
   char reply[64];
diff --git a/PC_Test/README.md b/PC_Test/README.md
new file mode 100644
index 0000000..bb00745
--- /dev/null
+++ b/PC_Test/README.md
@@ -0,0 +1,17 @@
+# SDC-ACQ_DAC 板卡测试上位机
+
+发布程序位于 `output/pc-test/SDC-ACQ_DAC-TestTool.exe`，目标为 Windows x86 和 ZLG USBCAN-II。
+
+## 使用前准备
+
+1. 将匹配的 ZLG x86 运行时复制到程序目录：`ControlCAN.dll`，以及 `kerneldlls/usbcan.dll` 和 `kerneldlls/kerneldll.ini`。
+2. 将 USB-CAN 与板卡 CAN1 或 CAN2 接在同一条 500 kbit/s 总线上，确认 CANH、CANL 和公共地正确连接。
+3. 关闭其他占用同一 USB-CAN 的软件后，启动程序，选择设备索引与 CAN 通道并点击“连接”。
+
+## 测试能力
+
+- 显示并记录 `0x6A0` 至 `0x6A6` 的实时报文；解码心跳、电压、轮速、GPIO 和 DAC 应答。
+- DAC1/DAC2 一次发送，或每 50 ms 持续发送。持续发送用于满足板卡每路 100 ms 的 DAC CAN 超时要求；停止后板卡将自行归零。
+- 一键发送 5 种 ASSI RGB 状态，以及标准帧手工发送。
+
+CAN 适配器以正常模式打开，因此会为板卡的 CAN 上报帧提供 ACK。
diff --git a/PC_Test/SDCAcqDacTester/App.xaml b/PC_Test/SDCAcqDacTester/App.xaml
new file mode 100644
index 0000000..21ed383
--- /dev/null
+++ b/PC_Test/SDCAcqDacTester/App.xaml
@@ -0,0 +1,6 @@
+<Application x:Class="SDCAcqDacTester.App"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             StartupUri="MainWindow.xaml">
+  <Application.Resources />
+</Application>
diff --git a/PC_Test/SDCAcqDacTester/App.xaml.cs b/PC_Test/SDCAcqDacTester/App.xaml.cs
new file mode 100644
index 0000000..465a634
--- /dev/null
+++ b/PC_Test/SDCAcqDacTester/App.xaml.cs
@@ -0,0 +1,5 @@
+using System.Windows;
+
+namespace SDCAcqDacTester;
+
+public partial class App : Application { }
diff --git a/PC_Test/SDCAcqDacTester/Can/ControlCanTransport.cs b/PC_Test/SDCAcqDacTester/Can/ControlCanTransport.cs
new file mode 100644
index 0000000..a324937
--- /dev/null
+++ b/PC_Test/SDCAcqDacTester/Can/ControlCanTransport.cs
@@ -0,0 +1,130 @@
+using System.Runtime.InteropServices;
+
+namespace SDCAcqDacTester.Can;
+
+public sealed record CanFrame(uint Id, bool IsExtended, byte[] Data, DateTime Timestamp);
+
+public sealed class ControlCanTransport : IDisposable
+{
+    private const uint DeviceTypeUsbCan2 = 4;
+    private const uint StatusOk = 1;
+    private CancellationTokenSource? _receiveCancel;
+    private Task? _receiveTask;
+    private uint _deviceIndex;
+    private uint _channelIndex;
+
+    public bool IsOpen { get; private set; }
+    public event EventHandler<CanFrame>? FrameReceived;
+    public event EventHandler<string>? ReceiveError;
+
+    [StructLayout(LayoutKind.Sequential)]
+    private struct VciInitConfig
+    {
+        public uint AccCode;
+        public uint AccMask;
+        public uint Reserved;
+        public byte Filter;
+        public byte Timing0;
+        public byte Timing1;
+        public byte Mode;
+    }
+
+    [StructLayout(LayoutKind.Sequential, Pack = 1)]
+    private struct VciCanObj
+    {
+        public uint Id;
+        public uint TimeStamp;
+        public byte TimeFlag;
+        public byte SendType;
+        public byte RemoteFlag;
+        public byte ExternFlag;
+        public byte DataLen;
+        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 8)] public byte[] Data;
+        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 3)] public byte[] Reserved;
+    }
+
+    [DllImport("ControlCAN.dll", CallingConvention = CallingConvention.StdCall)]
+    private static extern uint VCI_OpenDevice(uint deviceType, uint deviceIndex, uint reserved);
+    [DllImport("ControlCAN.dll", CallingConvention = CallingConvention.StdCall)]
+    private static extern uint VCI_CloseDevice(uint deviceType, uint deviceIndex);
+    [DllImport("ControlCAN.dll", CallingConvention = CallingConvention.StdCall)]
+    private static extern uint VCI_InitCAN(uint deviceType, uint deviceIndex, uint canIndex, ref VciInitConfig config);
+    [DllImport("ControlCAN.dll", CallingConvention = CallingConvention.StdCall)]
+    private static extern uint VCI_StartCAN(uint deviceType, uint deviceIndex, uint canIndex);
+    [DllImport("ControlCAN.dll", CallingConvention = CallingConvention.StdCall)]
+    private static extern uint VCI_ResetCAN(uint deviceType, uint deviceIndex, uint canIndex);
+    [DllImport("ControlCAN.dll", CallingConvention = CallingConvention.StdCall)]
+    private static extern uint VCI_Transmit(uint deviceType, uint deviceIndex, uint canIndex, [In] VciCanObj[] send, uint length);
+    [DllImport("ControlCAN.dll", CallingConvention = CallingConvention.StdCall)]
+    private static extern uint VCI_Receive(uint deviceType, uint deviceIndex, uint canIndex, [Out] VciCanObj[] receive, uint length, int waitTime);
+
+    public void Open(uint deviceIndex, uint channelIndex)
+    {
+        if (IsOpen) return;
+        _deviceIndex = deviceIndex;
+        _channelIndex = channelIndex;
+        if (VCI_OpenDevice(DeviceTypeUsbCan2, deviceIndex, 0) != StatusOk)
+            throw new InvalidOperationException("打开 USBCAN-II 失败。请确认设备未被其他程序占用，并检查 ControlCAN.dll。 ");
+
+        // SJA1000 timing for 500 kbit/s, normal mode so the adapter ACKs board frames.
+        var config = new VciInitConfig { AccCode = 0, AccMask = 0xFFFFFFFF, Filter = 1, Timing0 = 0x00, Timing1 = 0x1C, Mode = 0 };
+        if (VCI_InitCAN(DeviceTypeUsbCan2, deviceIndex, channelIndex, ref config) != StatusOk)
+        {
+            VCI_CloseDevice(DeviceTypeUsbCan2, deviceIndex);
+            throw new InvalidOperationException("初始化 CAN 失败（500 kbit/s）。");
+        }
+        if (VCI_StartCAN(DeviceTypeUsbCan2, deviceIndex, channelIndex) != StatusOk)
+        {
+            VCI_ResetCAN(DeviceTypeUsbCan2, deviceIndex, channelIndex);
+            VCI_CloseDevice(DeviceTypeUsbCan2, deviceIndex);
+            throw new InvalidOperationException("启动 CAN 通道失败。");
+        }
+        IsOpen = true;
+        _receiveCancel = new CancellationTokenSource();
+        _receiveTask = Task.Run(() => ReceiveLoop(_receiveCancel.Token));
+    }
+
+    public void SendStandard(uint id, ReadOnlySpan<byte> data)
+    {
+        if (!IsOpen) throw new InvalidOperationException("CAN 未连接。");
+        if (id > 0x7FF || data.Length > 8) throw new ArgumentOutOfRangeException(nameof(id));
+        var payload = new byte[8];
+        data.CopyTo(payload);
+        var frame = new VciCanObj { Id = id, SendType = 0, RemoteFlag = 0, ExternFlag = 0, DataLen = (byte)data.Length, Data = payload, Reserved = new byte[3] };
+        if (VCI_Transmit(DeviceTypeUsbCan2, _deviceIndex, _channelIndex, [frame], 1) != StatusOk)
+            throw new InvalidOperationException("CAN 发送失败。");
+    }
+
+    private void ReceiveLoop(CancellationToken token)
+    {
+        var buffer = Enumerable.Range(0, 100).Select(_ => new VciCanObj { Data = new byte[8], Reserved = new byte[3] }).ToArray();
+        try
+        {
+            while (!token.IsCancellationRequested)
+            {
+                uint count = VCI_Receive(DeviceTypeUsbCan2, _deviceIndex, _channelIndex, buffer, (uint)buffer.Length, 50);
+                if (count == 0 || count == uint.MaxValue) continue;
+                for (var i = 0; i < Math.Min(count, (uint)buffer.Length); i++)
+                {
+                    var item = buffer[i];
+                    if (item.RemoteFlag != 0) continue;
+                    FrameReceived?.Invoke(this, new CanFrame(item.Id, item.ExternFlag != 0, item.Data.Take(Math.Min(item.DataLen, (byte)8)).ToArray(), DateTime.Now));
+                }
+            }
+        }
+        catch (Exception ex) when (!token.IsCancellationRequested) { ReceiveError?.Invoke(this, ex.Message); }
+    }
+
+    public void Close()
+    {
+        if (!IsOpen) return;
+        _receiveCancel?.Cancel();
+        _receiveTask?.Wait(300);
+        VCI_ResetCAN(DeviceTypeUsbCan2, _deviceIndex, _channelIndex);
+        VCI_CloseDevice(DeviceTypeUsbCan2, _deviceIndex);
+        _receiveCancel?.Dispose();
+        _receiveCancel = null;
+        IsOpen = false;
+    }
+    public void Dispose() => Close();
+}
diff --git a/PC_Test/SDCAcqDacTester/MainWindow.xaml b/PC_Test/SDCAcqDacTester/MainWindow.xaml
new file mode 100644
index 0000000..b743123
--- /dev/null
+++ b/PC_Test/SDCAcqDacTester/MainWindow.xaml
@@ -0,0 +1,60 @@
+<Window x:Class="SDCAcqDacTester.MainWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        Title="SDC-ACQ_DAC 板卡测试工具" Height="820" Width="1230" MinHeight="680" MinWidth="1000"
+        Closing="Window_Closing" Background="#F5F7FA">
+  <Window.Resources>
+    <Style TargetType="GroupBox"><Setter Property="Margin" Value="8"/><Setter Property="Padding" Value="10"/><Setter Property="BorderBrush" Value="#C8D2DC"/></Style>
+    <Style TargetType="Button"><Setter Property="Margin" Value="3"/><Setter Property="Padding" Value="10,5"/></Style>
+    <Style TargetType="TextBox"><Setter Property="Margin" Value="3"/><Setter Property="Padding" Value="5"/></Style>
+  </Window.Resources>
+  <DockPanel Margin="12">
+    <Border DockPanel.Dock="Top" Background="#12324A" Padding="14" CornerRadius="5">
+      <Grid><Grid.ColumnDefinitions><ColumnDefinition/><ColumnDefinition Width="Auto"/></Grid.ColumnDefinitions>
+        <StackPanel><TextBlock Foreground="White" FontSize="22" FontWeight="SemiBold" Text="SDC-ACQ_DAC 板卡测试工具"/>
+          <TextBlock Foreground="#C9D9E8" Margin="0,4,0,0" Text="CAN 500 kbit/s · 标准帧 · 协议 0x6A0 - 0x6A6"/></StackPanel>
+        <TextBlock x:Name="ConnectionText" Grid.Column="1" VerticalAlignment="Center" Foreground="#FFCC66" FontSize="15" Text="未连接"/>
+      </Grid>
+    </Border>
+    <Grid Margin="0,8,0,0"><Grid.RowDefinitions><RowDefinition Height="Auto"/><RowDefinition Height="Auto"/><RowDefinition Height="*"/></Grid.RowDefinitions>
+      <GroupBox Header="连接 - ZLG USBCAN-II（x86 ControlCAN.dll）">
+        <StackPanel Orientation="Horizontal"><TextBlock VerticalAlignment="Center" Text="设备索引"/><TextBox x:Name="DeviceIndexBox" Width="45" Text="0"/>
+          <TextBlock VerticalAlignment="Center" Margin="10,0,0,0" Text="通道"/><ComboBox x:Name="ChannelBox" Width="80" SelectedIndex="0"><ComboBoxItem Content="CAN1"/><ComboBoxItem Content="CAN2"/></ComboBox>
+          <Button x:Name="ConnectButton" Click="ConnectButton_Click" Content="连接" Background="#2E7D32" Foreground="White"/><Button x:Name="DisconnectButton" Click="DisconnectButton_Click" Content="断开" IsEnabled="False"/>
+          <TextBlock Margin="16,0,0,0" VerticalAlignment="Center" Foreground="#556575" Text="使用正常模式，适配器会 ACK 板卡上报帧。"/>
+        </StackPanel>
+      </GroupBox>
+      <Grid Grid.Row="1"><Grid.ColumnDefinitions><ColumnDefinition Width="2*"/><ColumnDefinition Width="1.45*"/><ColumnDefinition Width="1.2*"/></Grid.ColumnDefinitions>
+        <GroupBox Header="DAC 控制 - 0x6A3"><Grid><Grid.RowDefinitions><RowDefinition/><RowDefinition/><RowDefinition Height="Auto"/></Grid.RowDefinitions>
+          <Grid Grid.Row="0"><Grid.ColumnDefinitions><ColumnDefinition Width="Auto"/><ColumnDefinition Width="85"/><ColumnDefinition/><ColumnDefinition Width="Auto"/></Grid.ColumnDefinitions>
+            <TextBlock VerticalAlignment="Center" Text="DAC1 (V)"/><TextBox x:Name="Dac1Box" Grid.Column="1" Text="0"/><Button Grid.Column="2" Click="SendDac1Once_Click" Content="发送一次"/><Button x:Name="HoldDac1Button" Grid.Column="3" Click="HoldDac1Button_Click" Content="开始保持"/>
+          </Grid>
+          <Grid Grid.Row="1"><Grid.ColumnDefinitions><ColumnDefinition Width="Auto"/><ColumnDefinition Width="85"/><ColumnDefinition/><ColumnDefinition Width="Auto"/></Grid.ColumnDefinitions>
+            <TextBlock VerticalAlignment="Center" Text="DAC2 (V)"/><TextBox x:Name="Dac2Box" Grid.Column="1" Text="0"/><Button Grid.Column="2" Click="SendDac2Once_Click" Content="发送一次"/><Button x:Name="HoldDac2Button" Grid.Column="3" Click="HoldDac2Button_Click" Content="开始保持"/>
+          </Grid>
+          <TextBlock Grid.Row="2" Margin="0,8,0,0" Foreground="#8A5200" TextWrapping="Wrap" Text="“保持”每 50 ms 发送一次，满足板卡 DAC 100 ms 超时要求；停止后，板卡将在最多 100 ms 内自动归零。"/>
+        </Grid></GroupBox>
+        <GroupBox Grid.Column="1" Header="ASSI RGB 状态 - 0x6A5"><WrapPanel>
+          <Button Click="Assi_Click" Tag="0" Content="关灯"/><Button Click="Assi_Click" Tag="1" Content="黄常亮" Background="#D8A500"/>
+          <Button Click="Assi_Click" Tag="2" Content="黄闪 2 Hz" Background="#D8A500"/><Button Click="Assi_Click" Tag="3" Content="蓝闪 2 Hz" Background="#2E6DB4" Foreground="White"/>
+          <Button Click="Assi_Click" Tag="4" Content="蓝常亮" Background="#2E6DB4" Foreground="White"/>
+        </WrapPanel></GroupBox>
+        <GroupBox Grid.Column="2" Header="手工帧发送"><StackPanel Orientation="Horizontal"><TextBox x:Name="RawIdBox" Width="72" Text="6A5" ToolTip="标准帧 ID，十六进制"/>
+          <TextBox x:Name="RawDataBox" Width="115" Text="00" ToolTip="字节，十六进制，以空格分隔"/><Button Click="SendRaw_Click" Content="发送"/>
+        </StackPanel></GroupBox>
+      </Grid>
+      <Grid Grid.Row="2"><Grid.RowDefinitions><RowDefinition Height="Auto"/><RowDefinition Height="*"/></Grid.RowDefinitions>
+        <UniformGrid Rows="1" Columns="5" Margin="8"><Border Background="White" Padding="9" BorderBrush="#D5DDE5" BorderThickness="1"><StackPanel><TextBlock Text="心跳 0x6A0" Foreground="#52606D"/><TextBlock x:Name="HeartbeatValue" FontSize="17" Text="--"/></StackPanel></Border>
+          <Border Background="White" Padding="9" BorderBrush="#D5DDE5" BorderThickness="1"><StackPanel><TextBlock Text="输入电压 0x6A1" Foreground="#52606D"/><TextBlock x:Name="AdcValue" FontSize="17" Text="--"/></StackPanel></Border>
+          <Border Background="White" Padding="9" BorderBrush="#D5DDE5" BorderThickness="1"><StackPanel><TextBlock Text="轮速 0x6A2" Foreground="#52606D"/><TextBlock x:Name="PwmValue" FontSize="17" Text="--" TextWrapping="Wrap"/></StackPanel></Border>
+          <Border Background="White" Padding="9" BorderBrush="#D5DDE5" BorderThickness="1"><StackPanel><TextBlock Text="GPIO 0x6A6" Foreground="#52606D"/><TextBlock x:Name="GpioValue" FontSize="17" Text="--"/></StackPanel></Border>
+          <Border Background="White" Padding="9" BorderBrush="#D5DDE5" BorderThickness="1"><StackPanel><TextBlock Text="DAC 应答 0x6A4" Foreground="#52606D"/><TextBlock x:Name="DacAckValue" FontSize="17" Text="--"/></StackPanel></Border>
+        </UniformGrid>
+        <GroupBox Grid.Row="1" Header="CAN 收发记录"><DataGrid x:Name="LogGrid" IsReadOnly="True" AutoGenerateColumns="False" CanUserAddRows="False" HeadersVisibility="Column"><DataGrid.Columns>
+          <DataGridTextColumn Header="时间" Binding="{Binding Time}" Width="135"/><DataGridTextColumn Header="方向" Binding="{Binding Direction}" Width="65"/><DataGridTextColumn Header="ID" Binding="{Binding Id}" Width="70"/>
+          <DataGridTextColumn Header="DLC" Binding="{Binding Dlc}" Width="50"/><DataGridTextColumn Header="数据" Binding="{Binding Data}" Width="180"/><DataGridTextColumn Header="解释" Binding="{Binding Description}" Width="*"/>
+        </DataGrid.Columns></DataGrid></GroupBox>
+      </Grid>
+    </Grid>
+  </DockPanel>
+</Window>
diff --git a/PC_Test/SDCAcqDacTester/MainWindow.xaml.cs b/PC_Test/SDCAcqDacTester/MainWindow.xaml.cs
new file mode 100644
index 0000000..f06df27
--- /dev/null
+++ b/PC_Test/SDCAcqDacTester/MainWindow.xaml.cs
@@ -0,0 +1,194 @@
+using System.Collections.ObjectModel;
+using System.Globalization;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Threading;
+using SDCAcqDacTester.Can;
+
+namespace SDCAcqDacTester;
+
+public partial class MainWindow : Window
+{
+    private const uint HeartbeatId = 0x6A0;
+    private const uint AdcId = 0x6A1;
+    private const uint PwmId = 0x6A2;
+    private const uint DacCommandId = 0x6A3;
+    private const uint DacAckId = 0x6A4;
+    private const uint AssiCommandId = 0x6A5;
+    private const uint GpioId = 0x6A6;
+
+    private readonly ObservableCollection<LogRow> _rows = [];
+    private readonly DispatcherTimer _holdTimer;
+    private ControlCanTransport? _can;
+    private bool _holdDac1;
+    private bool _holdDac2;
+
+    public MainWindow()
+    {
+        InitializeComponent();
+        LogGrid.ItemsSource = _rows;
+        _holdTimer = new DispatcherTimer { Interval = TimeSpan.FromMilliseconds(50) };
+        _holdTimer.Tick += HoldTimer_Tick;
+    }
+
+    private void ConnectButton_Click(object sender, RoutedEventArgs e)
+    {
+        try
+        {
+            if (!uint.TryParse(DeviceIndexBox.Text, out uint index)) throw new InvalidOperationException("设备索引必须为非负整数。");
+            _can = new ControlCanTransport();
+            _can.FrameReceived += Can_FrameReceived;
+            _can.ReceiveError += Can_ReceiveError;
+            _can.Open(index, (uint)ChannelBox.SelectedIndex);
+            ConnectionText.Text = $"已连接：USBCAN-II / CAN{ChannelBox.SelectedIndex + 1}";
+            ConnectionText.Foreground = System.Windows.Media.Brushes.LightGreen;
+            ConnectButton.IsEnabled = false;
+            DisconnectButton.IsEnabled = true;
+            AddLog("SYS", "-", [], "已连接，500 kbit/s 正常模式。");
+        }
+        catch (Exception ex) { ShowError(ex.Message); }
+    }
+
+    private void DisconnectButton_Click(object sender, RoutedEventArgs e) => Disconnect();
+
+    private void SendDac1Once_Click(object sender, RoutedEventArgs e) => SendDac(1, ReadVolts(Dac1Box));
+    private void SendDac2Once_Click(object sender, RoutedEventArgs e) => SendDac(2, ReadVolts(Dac2Box));
+
+    private void HoldDac1Button_Click(object sender, RoutedEventArgs e)
+    {
+        _holdDac1 = !_holdDac1;
+        HoldDac1Button.Content = _holdDac1 ? "停止保持" : "开始保持";
+        UpdateHoldTimer();
+    }
+
+    private void HoldDac2Button_Click(object sender, RoutedEventArgs e)
+    {
+        _holdDac2 = !_holdDac2;
+        HoldDac2Button.Content = _holdDac2 ? "停止保持" : "开始保持";
+        UpdateHoldTimer();
+    }
+
+    private void HoldTimer_Tick(object? sender, EventArgs e)
+    {
+        try
+        {
+            if (_holdDac1) SendDac(1, ReadVolts(Dac1Box));
+            if (_holdDac2) SendDac(2, ReadVolts(Dac2Box));
+        }
+        catch (Exception ex)
+        {
+            _holdDac1 = _holdDac2 = false;
+            HoldDac1Button.Content = HoldDac2Button.Content = "开始保持";
+            UpdateHoldTimer();
+            ShowError(ex.Message);
+        }
+    }
+
+    private void Assi_Click(object sender, RoutedEventArgs e)
+    {
+        if (sender is not Button { Tag: string value } || !byte.TryParse(value, out byte state)) return;
+        Send(AssiCommandId, [state], $"ASSI 状态={state}");
+    }
+
+    private void SendRaw_Click(object sender, RoutedEventArgs e)
+    {
+        try
+        {
+            uint id = uint.Parse(RawIdBox.Text.Trim().Replace("0x", "", StringComparison.OrdinalIgnoreCase), NumberStyles.HexNumber, CultureInfo.InvariantCulture);
+            byte[] data = string.IsNullOrWhiteSpace(RawDataBox.Text) ? [] : RawDataBox.Text.Split([' ', ',', ';'], StringSplitOptions.RemoveEmptyEntries)
+                .Select(x => byte.Parse(x.Replace("0x", "", StringComparison.OrdinalIgnoreCase), NumberStyles.HexNumber, CultureInfo.InvariantCulture)).ToArray();
+            Send(id, data, "手工帧");
+        }
+        catch (Exception ex) { ShowError($"手工帧格式错误：{ex.Message}"); }
+    }
+
+    private void SendDac(byte dac, ushort millivolts)
+    {
+        Send(DacCommandId, [dac, (byte)(millivolts & 0xFF), (byte)(millivolts >> 8)], $"DAC{dac}={millivolts} mV");
+    }
+
+    private void Send(uint id, byte[] data, string description)
+    {
+        try
+        {
+            if (_can is not { IsOpen: true }) throw new InvalidOperationException("请先连接 CAN。 ");
+            _can.SendStandard(id, data);
+            AddLog("TX", $"0x{id:X3}", data, description);
+        }
+        catch (Exception ex) { ShowError(ex.Message); }
+    }
+
+    private static ushort ReadVolts(TextBox box)
+    {
+        if (!decimal.TryParse(box.Text, NumberStyles.Number, CultureInfo.InvariantCulture, out decimal volts) &&
+            !decimal.TryParse(box.Text, NumberStyles.Number, CultureInfo.CurrentCulture, out volts))
+            throw new InvalidOperationException("DAC 电压必须是 0 - 5 V 的数值。");
+        if (volts is < 0 or > 5) throw new InvalidOperationException("DAC 电压范围为 0 - 5 V。");
+        return (ushort)Math.Round(volts * 1000m, MidpointRounding.AwayFromZero);
+    }
+
+    private void Can_FrameReceived(object? sender, CanFrame frame) => Dispatcher.Invoke(() =>
+    {
+        string description = Decode(frame);
+        AddLog("RX", frame.IsExtended ? $"0x{frame.Id:X8}" : $"0x{frame.Id:X3}", frame.Data, description, frame.Timestamp);
+    });
+
+    private void Can_ReceiveError(object? sender, string error) => Dispatcher.Invoke(() => ShowError($"接收异常：{error}"));
+
+    private string Decode(CanFrame frame)
+    {
+        var d = frame.Data;
+        switch (frame.Id)
+        {
+            case HeartbeatId when d.Length >= 8:
+                string heartbeat = $"板号=0x{d[0]:X2} 协议={d[1]} 序号={U16(d, 2)} 运行={U32(d, 4)} ms";
+                HeartbeatValue.Text = heartbeat; return heartbeat;
+            case AdcId when d.Length >= 2:
+                string adc = $"{U16(d, 0)} mV ({U16(d, 0) / 1000.0:F3} V)";
+                AdcValue.Text = adc; return adc;
+            case PwmId when d.Length >= 8:
+                string pwm = string.Join(" / ", Enumerable.Range(0, 4).Select(i => $"{U16(d, i * 2)} Hz"));
+                PwmValue.Text = pwm; return pwm;
+            case DacAckId when d.Length >= 4:
+                string ack = $"DAC{d[1]} {(d[0] == 1 ? "OK" : "ERR")} = {U16(d, 2)} mV";
+                DacAckValue.Text = ack; return ack;
+            case GpioId when d.Length >= 8:
+                string gpio = $"状态=0x{U16(d, 0):X4} 变化=0x{U16(d, 2):X4} 时间={U32(d, 4)} ms";
+                GpioValue.Text = gpio; return gpio;
+            default: return "未定义帧";
+        }
+    }
+
+    private static ushort U16(byte[] data, int offset) => (ushort)(data[offset] | (data[offset + 1] << 8));
+    private static uint U32(byte[] data, int offset) => (uint)(data[offset] | (data[offset + 1] << 8) | (data[offset + 2] << 16) | (data[offset + 3] << 24));
+
+    private void AddLog(string direction, string id, byte[] data, string description, DateTime? timestamp = null)
+    {
+        _rows.Insert(0, new LogRow((timestamp ?? DateTime.Now).ToString("HH:mm:ss.fff"), direction, id, data.Length.ToString(), BitConverter.ToString(data).Replace('-', ' '), description));
+        while (_rows.Count > 500) _rows.RemoveAt(_rows.Count - 1);
+    }
+
+    private void UpdateHoldTimer()
+    {
+        if (_holdDac1 || _holdDac2) _holdTimer.Start(); else _holdTimer.Stop();
+    }
+
+    private void Disconnect()
+    {
+        _holdDac1 = _holdDac2 = false;
+        _holdTimer.Stop();
+        _can?.Dispose(); _can = null;
+        ConnectionText.Text = "未连接"; ConnectionText.Foreground = System.Windows.Media.Brushes.Orange;
+        ConnectButton.IsEnabled = true; DisconnectButton.IsEnabled = false;
+    }
+
+    private void ShowError(string message)
+    {
+        AddLog("ERR", "-", [], message);
+        MessageBox.Show(message, "SDC-ACQ_DAC 测试工具", MessageBoxButton.OK, MessageBoxImage.Warning);
+    }
+
+    private void Window_Closing(object? sender, System.ComponentModel.CancelEventArgs e) => Disconnect();
+}
+
+public sealed record LogRow(string Time, string Direction, string Id, string Dlc, string Data, string Description);
diff --git a/PC_Test/SDCAcqDacTester/Native/x86/README.md b/PC_Test/SDCAcqDacTester/Native/x86/README.md
new file mode 100644
index 0000000..086c561
--- /dev/null
+++ b/PC_Test/SDCAcqDacTester/Native/x86/README.md
@@ -0,0 +1,9 @@
+# ZLG USBCAN-II driver files
+
+Copy the complete matching x86 vendor runtime into this directory before using hardware CAN:
+
+- `ControlCAN.dll` beside `SDC-ACQ_DAC-TestTool.exe`
+- `kerneldlls\\usbcan.dll`
+- `kerneldlls\\kerneldll.ini`
+
+Do not run another CAN application against the same adapter at the same time.
diff --git a/PC_Test/SDCAcqDacTester/SDCAcqDacTester.csproj b/PC_Test/SDCAcqDacTester/SDCAcqDacTester.csproj
new file mode 100644
index 0000000..33bdf1d
--- /dev/null
+++ b/PC_Test/SDCAcqDacTester/SDCAcqDacTester.csproj
@@ -0,0 +1,15 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net8.0-windows</TargetFramework>
+    <UseWPF>true</UseWPF>
+    <Platforms>x86</Platforms>
+    <PlatformTarget>x86</PlatformTarget>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <AssemblyName>SDC-ACQ_DAC-TestTool</AssemblyName>
+  </PropertyGroup>
+  <ItemGroup>
+    <None Include="Native\\x86\\README.md" CopyToOutputDirectory="PreserveNewest" />
+  </ItemGroup>
+</Project>
diff --git a/SDC-ACQ_DAC_固件交付说明.html b/SDC-ACQ_DAC_固件交付说明.html
index 86b8f2c..ecbbee6 100644
--- a/SDC-ACQ_DAC_固件交付说明.html
+++ b/SDC-ACQ_DAC_固件交付说明.html
@@ -77,7 +77,7 @@
   <table>
     <tr><th style="width:20%">功能</th><th>当前实现</th></tr>
     <tr><td>状态采集</td><td>采集 PD0–PD14 共 15 路数字输入。上电和任一输入变化时，向 CAN1、CAN2 发送完整状态与变化掩码。</td></tr>
-    <tr><td>频率采集</td><td>采集 PA0、PA2、PA6、PB14 的上升沿频率，每 500 ms 通过 CAN 和串口输出。</td></tr>
+    <tr><td>频率采集</td><td>采集 PA0、PA2、PA6、PB14 的上升沿频率，每 20 ms 通过 CAN 输出；串口每 500 ms 汇总输出。</td></tr>
     <tr><td>电压采集</td><td>ADC1_IN8（PB0）测量外部经分压后的输入；对外输出分压前、已标定且滤波后的电压。</td></tr>
     <tr><td>CAN</td><td>CAN1 与 CAN2 均为 500 kbit/s、11 位标准数据帧，并使用相同协议。</td></tr>
     <tr><td>DAC</td><td>通过 I2C2 控制两颗 MCP4725，接收 CAN 命令或串口命令设置 0–5.000 V 输出。</td></tr>
@@ -99,10 +99,10 @@
   <p>所有字段均为小端序（低字节在前）。板卡主动上报的帧会分别发到 CAN1 和 CAN2。</p>
   <table>
     <tr><th style="width:13%">CAN ID</th><th style="width:19%">名称</th><th style="width:22%">方向 / 时机</th><th>数据定义</th></tr>
-    <tr><td><code>0x6A0</code></td><td>心跳</td><td>板卡发送，每 1 s</td><td><code>A1 01 seq_L seq_H uptime_0..3</code>；板号 A1、协议版本 1、序号、运行时间 ms。</td></tr>
+    <tr><td><code>0x6A0</code></td><td>心跳</td><td>板卡发送，每 100 ms</td><td><code>A1 01 seq_L seq_H uptime_0..3</code>；板号 A1、协议版本 1、序号、运行时间 ms。</td></tr>
     <tr><td><code>0x6A1</code></td><td>输入电压</td><td>板卡发送，每 500 ms</td><td><code>uint16</code>，单位 mV。例如 <code>90 2F</code> = 0x2F90 = 12176 mV = 12.176 V。</td></tr>
-    <tr><td><code>0x6A2</code></td><td>四路频率</td><td>板卡发送，每 500 ms</td><td>4 个 <code>uint16</code>，单位 Hz；依次为 PA0、PA2、PA6、PB14。</td></tr>
-    <tr><td><code>0x6A3</code></td><td>DAC 设置</td><td>外部发送给板卡</td><td><code>[DAC 编号][mV_L][mV_H]</code>，编号仅允许 1 或 2。</td></tr>
+    <tr><td><code>0x6A2</code></td><td>四路频率</td><td>板卡发送，每 20 ms</td><td>4 个 <code>uint16</code>，单位 Hz；依次为 PA0、PA2、PA6、PB14。</td></tr>
+    <tr><td><code>0x6A3</code></td><td>DAC 设置</td><td>外部发送给板卡</td><td><code>[DAC 编号][mV_L][mV_H]</code>，编号仅允许 1 或 2；每路 100 ms 未续帧归零。</td></tr>
     <tr><td><code>0x6A4</code></td><td>DAC 应答</td><td>板卡发送，设置后</td><td><code>[结果][DAC 编号][mV_L][mV_H]</code>；结果 1 成功，0 失败。</td></tr>
     <tr><td><code>0x6A5</code></td><td>ASSI RGB 灯控</td><td>外部发送给板卡</td><td><code>byte0</code>：0=关、1=黄常亮、2=黄闪、3=蓝闪、4=蓝常亮。</td></tr>
     <tr><td><code>0x6A6</code></td><td>15 路状态</td><td>板卡发送，上电或状态变化</td><td>状态 <code>uint16</code>、变化掩码 <code>uint16</code>、时间戳 <code>uint32 ms</code>。</td></tr>
diff --git a/SDC_ACQ_DAC.dbc b/SDC_ACQ_DAC.dbc
index 58e76e0..767c357 100644
--- a/SDC_ACQ_DAC.dbc
+++ b/SDC_ACQ_DAC.dbc
@@ -72,17 +72,17 @@ VAL_ 1700 DAC_Set_Result 0 "Failed" 1 "OK" ;
 VAL_ 1700 DAC_Select 1 "DAC1" 2 "DAC2" ;
 VAL_ 1701 ASSI_State 0 "AS_OFF" 1 "AS_READY" 2 "AS_DRIVING" 3 "AS_EMERGENCY" 4 "AS_FINISHED" ;
 
-CM_ BO_ 1696 "Standard ID 0x6A0. Sent every 1 s on CAN1 and CAN2.";
+CM_ BO_ 1696 "Standard ID 0x6A0. Sent every 100 ms on CAN1 and CAN2.";
 CM_ BO_ 1697 "Standard ID 0x6A1. Filtered and calibrated physical input voltage before the hardware divider.";
-CM_ BO_ 1698 "Standard ID 0x6A2. Sent every 500 ms. Frequency order is PA0, PA2, PA6, PB14.";
-CM_ BO_ 1699 "Standard ID 0x6A3. Accepted on CAN1 and CAN2. The on-wire voltage is an unsigned mV value.";
+CM_ BO_ 1698 "Standard ID 0x6A2. Sent every 20 ms. Frequency order is PA0, PA2, PA6, PB14.";
+CM_ BO_ 1699 "Standard ID 0x6A3. Accepted on CAN1 and CAN2. The on-wire voltage is an unsigned mV value. Each DAC is reset to 0 mV if its own control frame is not received again within 100 ms.";
 CM_ BO_ 1700 "Standard ID 0x6A4. Sent on CAN1 and CAN2 after a DAC command. Result 0 indicates the I2C write failed.";
 CM_ BO_ 1701 "Standard ID 0x6A5. Accepted on CAN1 and CAN2. Byte 0 selects the latched ASSI RGB lamp state: AS_OFF, AS_READY, AS_DRIVING, AS_EMERGENCY, or AS_FINISHED.";
 CM_ BO_ 1702 "Standard ID 0x6A6. Sent at startup and whenever PD0-PD14 state changes, on CAN1 and CAN2.";
-CM_ SG_ 256 Board_Identifier "Fixed board identifier 0xA1.";
-CM_ SG_ 259 Frequency_PA0 "TIM5_CH1 input capture on PA0.";
-CM_ SG_ 259 Frequency_PA2 "TIM9_CH1 input capture on PA2.";
-CM_ SG_ 259 Frequency_PA6 "TIM3_CH1 input capture on PA6.";
-CM_ SG_ 259 Frequency_PB14 "TIM12_CH1 input capture on PB14.";
-CM_ SG_ 816 SDC_Input_State "Bit 0 through bit 14 map directly to PD0 through PD14.";
-CM_ SG_ 816 SDC_Changed_Mask "A set bit identifies an input that changed since the preceding GPIO-status frame.";
+CM_ SG_ 1696 Board_Identifier "Fixed board identifier 0xA1.";
+CM_ SG_ 1698 Frequency_PA0 "TIM5_CH1 input capture on PA0.";
+CM_ SG_ 1698 Frequency_PA2 "TIM9_CH1 input capture on PA2.";
+CM_ SG_ 1698 Frequency_PA6 "TIM3_CH1 input capture on PA6.";
+CM_ SG_ 1698 Frequency_PB14 "TIM12_CH1 input capture on PB14.";
+CM_ SG_ 1702 SDC_Input_State "Bit 0 through bit 14 map directly to PD0 through PD14.";
+CM_ SG_ 1702 SDC_Changed_Mask "A set bit identifies an input that changed since the preceding GPIO-status frame.";
diff --git a/output/dbc/SDC_ACQ_DAC.dbc b/output/dbc/SDC_ACQ_DAC.dbc
new file mode 100644
index 0000000..767c357
--- /dev/null
+++ b/output/dbc/SDC_ACQ_DAC.dbc
@@ -0,0 +1,88 @@
+VERSION "1.1"
+
+NS_ :
+    NS_DESC_
+    CM_
+    BA_DEF_
+    BA_
+    VAL_
+    CAT_DEF_
+    CAT_
+    FILTER
+    BA_DEF_DEF_
+    EV_DATA_
+    ENVVAR_DATA_
+    SGTYPE_
+    SGTYPE_VAL_
+    BA_DEF_SGTYPE_
+    BA_SGTYPE_
+    SIG_TYPE_REF_
+    VAL_TABLE_
+    SIG_GROUP_
+    SIG_VALTYPE_
+    SIGTYPE_VALTYPE_
+    BO_TX_BU_
+    BA_DEF_REL_
+    BA_REL_
+    BA_DEF_DEF_REL_
+    BU_SG_REL_
+    BU_EV_REL_
+    BU_BO_REL_
+    SG_MUL_VAL_
+
+BS_:
+
+BU_: SDC_ACQ_DAC VehicleController
+
+BO_ 1696 SDC_Heartbeat: 8 SDC_ACQ_DAC
+ SG_ Board_Identifier : 0|8@1+ (1,0) [0|255] ""  VehicleController
+ SG_ Protocol_Version : 8|8@1+ (1,0) [0|255] ""  VehicleController
+ SG_ Heartbeat_Sequence : 16|16@1+ (1,0) [0|65535] ""  VehicleController
+ SG_ Uptime : 32|32@1+ (0.001,0) [0|4294967.295] "s"  VehicleController
+
+BO_ 1697 SDC_ADC_InputVoltage: 2 SDC_ACQ_DAC
+ SG_ Input_Voltage : 0|16@1+ (0.001,0) [0|65.535] "V"  VehicleController
+
+BO_ 1698 SDC_InputFrequencies: 8 SDC_ACQ_DAC
+ SG_ Frequency_PA0 : 0|16@1+ (1,0) [0|65535] "Hz"  VehicleController
+ SG_ Frequency_PA2 : 16|16@1+ (1,0) [0|65535] "Hz"  VehicleController
+ SG_ Frequency_PA6 : 32|16@1+ (1,0) [0|65535] "Hz"  VehicleController
+ SG_ Frequency_PB14 : 48|16@1+ (1,0) [0|65535] "Hz"  VehicleController
+
+BO_ 1699 SDC_DAC_Set: 3 VehicleController
+ SG_ DAC_Select : 0|8@1+ (1,0) [1|2] ""  SDC_ACQ_DAC
+ SG_ DAC_Command_Voltage : 8|16@1+ (0.001,0) [0|5] "V"  SDC_ACQ_DAC
+
+BO_ 1700 SDC_DAC_Ack: 4 SDC_ACQ_DAC
+ SG_ DAC_Set_Result : 0|8@1+ (1,0) [0|1] ""  VehicleController
+ SG_ DAC_Select : 8|8@1+ (1,0) [1|2] ""  VehicleController
+ SG_ DAC_Output_Voltage : 16|16@1+ (0.001,0) [0|5] "V"  VehicleController
+
+BO_ 1701 ASSI_Lamp_Set: 1 VehicleController
+ SG_ ASSI_State : 0|8@1+ (1,0) [0|4] ""  SDC_ACQ_DAC
+
+BO_ 1702 SDC_GPIO_Status: 8 SDC_ACQ_DAC
+ SG_ SDC_Input_State : 0|15@1+ (1,0) [0|32767] ""  VehicleController
+ SG_ SDC_Changed_Mask : 16|15@1+ (1,0) [0|32767] ""  VehicleController
+ SG_ Timestamp : 32|32@1+ (0.001,0) [0|4294967.295] "s"  VehicleController
+
+VAL_ 1696 Board_Identifier 161 "A11_F407" ;
+VAL_ 1699 DAC_Select 1 "DAC1" 2 "DAC2" ;
+VAL_ 1700 DAC_Set_Result 0 "Failed" 1 "OK" ;
+VAL_ 1700 DAC_Select 1 "DAC1" 2 "DAC2" ;
+VAL_ 1701 ASSI_State 0 "AS_OFF" 1 "AS_READY" 2 "AS_DRIVING" 3 "AS_EMERGENCY" 4 "AS_FINISHED" ;
+
+CM_ BO_ 1696 "Standard ID 0x6A0. Sent every 100 ms on CAN1 and CAN2.";
+CM_ BO_ 1697 "Standard ID 0x6A1. Filtered and calibrated physical input voltage before the hardware divider.";
+CM_ BO_ 1698 "Standard ID 0x6A2. Sent every 20 ms. Frequency order is PA0, PA2, PA6, PB14.";
+CM_ BO_ 1699 "Standard ID 0x6A3. Accepted on CAN1 and CAN2. The on-wire voltage is an unsigned mV value. Each DAC is reset to 0 mV if its own control frame is not received again within 100 ms.";
+CM_ BO_ 1700 "Standard ID 0x6A4. Sent on CAN1 and CAN2 after a DAC command. Result 0 indicates the I2C write failed.";
+CM_ BO_ 1701 "Standard ID 0x6A5. Accepted on CAN1 and CAN2. Byte 0 selects the latched ASSI RGB lamp state: AS_OFF, AS_READY, AS_DRIVING, AS_EMERGENCY, or AS_FINISHED.";
+CM_ BO_ 1702 "Standard ID 0x6A6. Sent at startup and whenever PD0-PD14 state changes, on CAN1 and CAN2.";
+CM_ SG_ 1696 Board_Identifier "Fixed board identifier 0xA1.";
+CM_ SG_ 1698 Frequency_PA0 "TIM5_CH1 input capture on PA0.";
+CM_ SG_ 1698 Frequency_PA2 "TIM9_CH1 input capture on PA2.";
+CM_ SG_ 1698 Frequency_PA6 "TIM3_CH1 input capture on PA6.";
+CM_ SG_ 1698 Frequency_PB14 "TIM12_CH1 input capture on PB14.";
+CM_ SG_ 1702 SDC_Input_State "Bit 0 through bit 14 map directly to PD0 through PD14.";
+CM_ SG_ 1702 SDC_Changed_Mask "A set bit identifies an input that changed since the preceding GPIO-status frame.";
diff --git a/output/pdf/CAN报文说明表.pdf b/output/pdf/CAN报文说明表.pdf
index 8813947..891a288 100644
--- a/output/pdf/CAN报文说明表.pdf
+++ b/output/pdf/CAN报文说明表.pdf
@@ -47,7 +47,7 @@ endobj
 endobj
 6 0 obj
 <<
-/Author (\(anonymous\)) /CreationDate (D:20260918211423+08'00') /Creator (\(unspecified\)) /Keywords () /ModDate (D:20260918211423+08'00') /Producer (ReportLab PDF Library - \(opensource\)) 
+/Author (\(anonymous\)) /CreationDate (D:20260922213520+08'00') /Creator (\(unspecified\)) /Keywords () /ModDate (D:20260922213520+08'00') /Producer (ReportLab PDF Library - \(opensource\)) 
   /Subject (\(unspecified\)) /Title (\376\377\000S\000D\000C\000-\000A\000C\000Q\000_\000D\000A\000C\000 \000C\000A\000N\000 b\245e\207\213\364f\016\210h) /Trapped /False
 >>
 endobj
@@ -58,10 +58,10 @@ endobj
 endobj
 8 0 obj
 <<
-/Filter [ /ASCII85Decode /FlateDecode ] /Length 2111
+/Filter [ /ASCII85Decode /FlateDecode ] /Length 2151
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diff --git a/固件使用说明.md b/固件使用说明.md
index 944430d..bdfb0d1 100644
--- a/固件使用说明.md
+++ b/固件使用说明.md
@@ -12,8 +12,8 @@
 2. 接收 CAN1、CAN2 的 DAC 控制帧。
 3. 读取四路定时器捕获值并计算频率。
 4. 汇总 15 路 GPIO 变化并上报。
-5. 每 500 ms 上报 ADC 和四路频率。
-6. 每 500 ms 翻转运行指示灯，每 1 s 发送 CAN 心跳。
+5. 每 500 ms 上报 ADC、每 20 ms 上报四路频率。
+6. 每 500 ms 翻转运行指示灯，每 100 ms 发送 CAN 心跳。
 
 `PE0` 为正常运行心跳灯；若进入 `Error_Handler()`，`PE0` 和 `PE1` 会快速同时翻转。
 
@@ -78,16 +78,18 @@ CAN1 和 CAN2 使用相同协议，所有主动上报均分别发送到两条总
 
 | ID | 名称 | 周期/触发 | 数据 |
 |---:|---|---|---|
-| `0x6A0` | 心跳 | 每 1 s | `A1 01 seq_L seq_H uptime_0..3` |
+| `0x6A0` | 心跳 | 每 100 ms | `A1 01 seq_L seq_H uptime_0..3` |
 | `0x6A1` | ADC 电压 | 每 500 ms | 输入电压 `uint16`，单位 mV |
-| `0x6A2` | 四路频率 | 每 500 ms | 4 个 `uint16`，单位 Hz，顺序 PA0/PA2/PA6/PB14 |
-| `0x6A3` | DAC 设置命令 | 接收 | `[DAC 编号][mV_L][mV_H]` |
+| `0x6A2` | 四路频率 | 每 20 ms | 4 个 `uint16`，单位 Hz，顺序 PA0/PA2/PA6/PB14 |
+| `0x6A3` | DAC 设置命令 | 接收 | `[DAC 编号][mV_L][mV_H]`；每路在 100 ms 内未收到本路下一帧时归零 |
 | `0x6A4` | DAC 应答 | 每次 DAC 设置后 | `[结果][DAC 编号][mV_L][mV_H]` |
 | `0x6A5` | ASSI 灯控 | 接收 | `byte0`：`0=AS_OFF`、`1=AS_READY`、`2=AS_DRIVING`、`3=AS_EMERGENCY`、`4=AS_FINISHED` |
 | `0x6A6` | GPIO 状态 | 上电、任一输入变化 | 状态 `uint16`、变化掩码 `uint16`、时间戳 `uint32 ms` |
 
 心跳帧中板号为 `0xA1`、协议版本为 `0x01`，序号与上电时间均为低字节在前。完整信号定义和量纲以 [DBC 文件](SDC_ACQ_DAC.dbc) 为准。
 
+DAC 的 CAN 安全超时按通道独立执行：收到 `0x6A3` 中 DAC1 或 DAC2 的有效控制帧后，该通道必须在 100 ms 内再次收到自己的控制帧，否则固件仅将该通道写为 0 mV 一次。串口 DAC 指令不启动或刷新这个 CAN 控制帧超时。
+
 ### ASSI RGB 状态灯
 
 `PE9/PE10/PE11` 分别控制外部红、绿、蓝灯 MOS，均为高电平有效。`0x6A5` 可由 CAN1 或 CAN2 接收，状态在下一帧有效灯控报文到达前保持不变；上电默认 `AS_OFF`。`AS_READY` 为红绿常亮（黄），`AS_DRIVING` 为红绿以 2 Hz、50% 占空比闪烁（各 250 ms 亮/灭），`AS_EMERGENCY` 为蓝灯以相同节奏闪烁，`AS_FINISHED` 为蓝灯常亮。`PE0` 运行心跳和 `PE1` 故障指示保持原行为。