public void ModbusRequestRead(byte slaveAddress, UInt16 regAddress, UInt16 regNumber)
{
byte[] adu = ModbusADU.CreateRequestADU03(regAddress, regNumber);
byte[] requestFrame = ModbusSerialPDU.CreatePDU(slaveAddress, adu);
/*if (CommunicationThread!= null)
* while (CommunicationThread.IsAlive) ;*/
ModbusParam param = new ModbusParam(regNumber * 2 + 5, requestFrame);
Thread CommunicationThread = new Thread(ModbusSendReceive);
CommunicationThread.Start(param);
}
public void ModbusRequestWrite(byte slaveAddress, UInt16 regAddress, Int16[] values)
{
ushort[] uValues = new ushort[values.Length];
Buffer.BlockCopy(values, 0, uValues, 0, values.Length * 2);
byte[] adu = ModbusADU.CreateRequestADU10(regAddress, uValues);
byte[] requestFrame = ModbusSerialPDU.CreatePDU(slaveAddress, adu);
/*if (CommunicationThread != null)
* while (CommunicationThread.IsAlive) ;*/
Thread CommunicationThread = new Thread(ModbusSendReceive);
ModbusParam param = new ModbusParam(8, requestFrame);
CommunicationThread.Start(param);
}
private void ModbusSendReceive(object param)
{
lock (this)
{
try
{
ModbusParam parameters;
if (param is ModbusParam)
{
parameters = (ModbusParam)param;
}
else
{
throw new ModbusPDUException("Wrong parametrization of ModbusSendReceive method.");
}
byte[] responseFrame = new byte[(int)parameters.ResponseSize];
COMPort.DiscardInBuffer();
COMPort.Write(parameters.RequestADU, 0, parameters.RequestADU.Length);
Thread.Sleep(ResponseWaitingDelay);
COMPort.Read(responseFrame, 0, (int)parameters.ResponseSize);
byte[] adu = ModbusSerialPDU.extractADU(responseFrame);
if (responseFrame[1] > (byte)127)
{
throw new ModbusPDUException(String.Format("Modbus application error : function {0:X}, exception {1:X}", responseFrame[1], responseFrame[2]));
}
else
if (responseFrame[1] == 0x03)
{
Int16[] values = GetValuesFromResponseADU03(adu);
ModbusDataReceived(values);
}
}
catch (Exception ex)
{
commException = ex;
ModbusError(ex);
}
}
}
