private void BroadcastTimer_Elapsed(object sender, ElapsedEventArgs e)
{
TxRxStatus = TranmitingStatus.Idle;
BroadcastTimer.Enabled = false;
Console.Write("Broadcasting done!");
IsBroadcastTimeout = true;
}
private void ACKTimer_Elapsed(object sender, ElapsedEventArgs e)
{
TxRxStatus = TranmitingStatus.Idle;
ACKTimer.Enabled = false;
Console.Write("NO ACK!");
IsACKTimeout = true;
}
public void ModbusReceiveData_SerialPort(object sender, SerialDataReceivedEventArgs e) //供外部SerialPort调用的数据接收事件
{
RxDataTimer.Enabled = false; //定时器停止计数并将计数值归零
RxDataTimer.Enabled = true; //定时器重新开始计数
TxRxStatus = TranmitingStatus.Receiving; //Modbus状态为标记为“接收中”
UInt16 n = (UInt16)((SerialPort)sender).BytesToRead; //先记录下来，避免某种原因，人为的原因，操作几次之间时间长，缓存不一致
((SerialPort)sender).Read(TxRxBuffer, Pointer, n); //读取缓冲数据
Pointer += n; //增加接收计数
RxLength = Pointer;
}
public byte Disassemble_ReceivedADU()
{
if (IsMaster == true)
{
if (StationID != TxRxBuffer[0]) //站号错误不进行任何处理，立即返回（ACKTimeout定时器继续定时）
{
return((byte)ErrorStatus.ERR_Station);
}
ACKTimer.Enabled = false; //通过上面站号检测的说明是期望子节点发送来的响应帧，因而停止ACKTimeout倒计时。
TxRxStatus = TranmitingStatus.Idle; //总线状态置为空闲，允许发送其他帧（会不会放在本函数最后好，不然要是Modbus发送了其他的帧，并接收了返回的帧，上一次此处的处理还未完成怎么办？）
if (RxLength < 5)
{
return((byte)ErrorStatus.ERR_BreakFrame);
}
TempWord.HByte = TxRxBuffer[RxLength - 2];
TempWord.LByte = TxRxBuffer[RxLength - 1];
if (TempWord.Word != CRCCaculation.CRC16(TxRxBuffer, (UInt16)(RxLength - 2)))
{
return((byte)ErrorStatus.ERR_CRCCode); //检测CRC是否错误
}
FunctionCode = TxRxBuffer[1]; //记录功能码
switch (FunctionCode)
{
case (byte)ModbusFuncCode.WriteSingleCoil:
case (byte)ModbusFuncCode.WriteCoils:
case (byte)ModbusFuncCode.WriteRegs:
case (byte)ModbusFuncCode.WriteSingleReg:
TempWord.HByte = TxRxBuffer[2]; //检查地址是否正确
TempWord.LByte = TxRxBuffer[3];
if (TempWord.Word != Address)
{
return((byte)ErrorStatus.ERR_Address);
}
TempWord.HByte = TxRxBuffer[4]; //检查写入单元数量或写入的单个数据是否正确
TempWord.LByte = TxRxBuffer[5];
if (TempWord.Word != NumOrData)
{
return((byte)ErrorStatus.ERR_NumOrData);
}
ModbusWriteSuccessEvent(); //（事件引发）如果以上均正确，说明Modbus主向外写操作成功，引发“写成功”事件
break;
case (byte)ModbusFuncCode.ReadCoils:
case (byte)ModbusFuncCode.ReadDistrbuteBits:
case (byte)ModbusFuncCode.ReadStorageRegs:
case (byte)ModbusFuncCode.ReadInputRegs:
DataByteNumber = TxRxBuffer[2];
DataStorage[TempControlIndex] = new byte[DataByteNumber];
for (byte i = 0; i < DataByteNumber; i++)
{
DataStorage[TempControlIndex][i] = TxRxBuffer[i + 3];
}
ModbusReadSuccessEvent(); //（事件引发）如果以上均正确，说明Modbus主读输入寄存器成功，引发“读输入寄存器成功”事件
break;
case ((byte)ModbusFuncCode.ReadCoils + 0x80):
case ((byte)ModbusFuncCode.ReadDistrbuteBits + 0x80):
case ((byte)ModbusFuncCode.ReadStorageRegs + 0x80):
case ((byte)ModbusFuncCode.ReadInputRegs + 0x80):
case ((byte)ModbusFuncCode.WriteSingleCoil + 0x80):
case ((byte)ModbusFuncCode.WriteSingleReg + 0x80):
case ((byte)ModbusFuncCode.WriteCoils + 0x80):
case ((byte)ModbusFuncCode.WriteRegs + 0x80):
ModbusReceiveExceptionEvent(); //（事件引发）接收到异常帧
return((byte)ErrorStatus.ERR_Response);
default:
return((byte)ErrorStatus.ERR_FunctionCode); //检测FunctionCode是否错误
}
}
else
{
//Slaver To Do...
}
return((byte)ErrorStatus.ERR_OK);
}
private Boolean MasterSendFrame()
{
byte[] TxBuffer;
Console.Write(TxRxStatus + "\n");
if (TxRxStatus == TranmitingStatus.Idle)
{
if ((HighPriorityFrameRdy == true) || (LowPriorityFrameRdy == true))
{
Console.Write(LowPriorityTxBufferQueue.Count + " " + LPControlsIndexQueue.Count + "\n");
if (HighPriorityFrameRdy == true)
{
if (HighPriorityTxBufferQueue.Count <= 0)//如过FIFO空，则复位Ready标志位，禁止周期行为
{
HighPriorityFrameRdy = false;
return(true);
}
lock (HighPriorityTxBufferQueue)//锁定，防止线程间串扰（非常重要）
{
lock (HPControlsIndexQueue)
{
TxBuffer = HighPriorityTxBufferQueue.Dequeue(); //从FIFO中取用待发送的帧
TempControlIndex = HPControlsIndexQueue.Dequeue(); //取用待发送帧对应的控件的索引
}
}
}
else
{
if (LowPriorityTxBufferQueue.Count <= 0)
{
LowPriorityFrameRdy = false;
return(true);
}
lock (LowPriorityTxBufferQueue)
{
lock (LPControlsIndexQueue)
{
TxBuffer = LowPriorityTxBufferQueue.Dequeue();
TempControlIndex = LPControlsIndexQueue.Dequeue();
}
}
}
//Console.Write(TxBuffer.Length);
try //此处不能用if语句简化
{
ModbusSendFrame(TxBuffer, 0, TxBuffer.Length); //调用发送函数（委托）
}
catch
{
Console.Write("Error:ModbusSendFrame未关联 或 Serialport未打开！\n");
return(false);
}
TxRxStatus = TranmitingStatus.Sending; //Modbus收发标志位置 “发送中”
if (TxBuffer[0] == 0) //此处用到StationID，说明全局的StationID变量是必要的，不可弃用
{
IsBroadcastTimeout = false; //如果是广播帧，先清广播帧超时标志位（其实没必要，只是为了以防不可预知的改变）
BroadcastTimer.Enabled = true; //打开广播帧超时定时器
}
else
{
IsACKTimeout = false;
ACKTimer.Enabled = true;
}
}
}
return(true);
}
private void ModbusRTU_ModbusReadSuccessEvent()
{
DataStorageFlag[TempControlIndex] = true;
TxRxStatus = TranmitingStatus.Idle;
}
