public static bool SendData(byte[] TxBuffer, int TxLength, int RxLength)
{
int ReadByteSCount = 0, LeftByteSCount;
int RetryTimes;
byte[] ReadDatas = new byte[320];
for (RetryTimes = 0; RetryTimes < 3; RetryTimes++)
{
try
{
CommPort.DiscardOutBuffer();
CommPort.DiscardInBuffer();
CommPort.ReadTimeout = 400; //200ms超时
CommPort.Write(TxBuffer, 0, TxLength); //写命令
if (TxBuffer[0] == 0xFE)
{
return(true); //对于子广播命令,发送命令后直接返回
}
ReadByteSCount = 0;
LeftByteSCount = RxLength;
if (TxBuffer[0] != 0xFE)
{
while (ReadByteSCount < RxLength)
{ //开始读取数据
ReadByteSCount += CommPort.Read(ReadDatas, ReadByteSCount, LeftByteSCount);
LeftByteSCount = RxLength - ReadByteSCount;
}
if (ReadByteSCount >= RxLength)
{
RetryTimes = 1000;
}
}
else
{
break;
}
}
catch (TimeoutException) //读取超时
{
}
}
if (ReadByteSCount >= 5)
{
int Result = ModBusProc.ExpendRxMessage(ref Modbus232, ReadDatas, ReadByteSCount);
if (Result == ModBusProc.MsgSuccess)
{
return(true);
}
}
if (TxBuffer[0] == 0xFE)
{
return(true); //广播地址总是返回正确
}
return(false);
}
public static bool WritePacket(int DevAddr, int StartReg, int RegCount, byte[] Datas, int DataLength)
{
if (CommByRS232.CommPort.IsOpen == false)
{
MessageBox.Show("端口未打开,请先打开端口!");
return(false);
}
ModBusProc.CreateTxHeader(ref Modbus232, DevAddr, ModBusProc.CmdCode_Write, StartReg, RegCount, Datas, DataLength);
byte[] TxBuffer = new byte[320];
int TxLength = ModBusProc.CreateTxMessage(ref Modbus232, ref TxBuffer);
return(SendData(TxBuffer, TxLength, 8));
}
public static bool ReadPacket(int DevAddr, int StartReg, int RegCount, ref byte[] Datas, ref int DataLength)
{
if (CommByRS232.CommPort.IsOpen == false)
{
MessageBox.Show("端口未打开,请先打开端口!");
return(false);
}
bool R;
ModBusProc.CreateTxHeader(ref Modbus232, DevAddr, ModBusProc.CmdCode_Read, StartReg, RegCount, Datas, 0);
byte[] TxBuffer = new byte[320];
int TxLength = ModBusProc.CreateTxMessage(ref Modbus232, ref TxBuffer);
R = SendData(TxBuffer, TxLength, 5 + RegCount * 2);
if (R == true)
{
Array.Copy(Modbus232.RxMsg.DataBuffer, Datas, Modbus232.RxMsg.DataLenth);
DataLength = Modbus232.RxMsg.DataLenth;
}
return(R);
}
public static bool InitCommPort(string CommName, int BaudRate, int LocalAddr, bool LocalMode)
{
ModBusProc.Modbus_Create(ref Modbus232, LocalAddr, LocalMode);
try
{
if (CommPort.IsOpen)
{
CommPort.Close();
}
CommPort.PortName = CommName;
CommPort.BaudRate = BaudRate;
CommPort.DataBits = 8;
CommPort.Parity = Parity.None;
CommPort.StopBits = StopBits.One;
CommPort.Open();
}
catch (Exception E)
{
MessageBox.Show("错误：" + E.Message, "串口打开错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
return(CommPort.IsOpen);
}