public byte[] ReadBytes(DeviceAddress address, ushort size)
{
var func = (byte)address.DBNumber;
string tempStrg = string.Empty;
string buffReceiver = string.Empty;
try
{
lock (_async)
{
switch (func)
{
case 0:
byte[] frame = XGTCnetMessage.ReadCoilStatusMessage(Convert.ToByte(address.Area), "MB", Convert.ToString(address.Start), size);
_serialPort.Write(frame, 0, frame.Length);
Thread.Sleep(100);
break;
case 1:
byte[] frame1 = XGTCnetMessage.ReadInputStatusMessage(Convert.ToByte(address.Area), "PB", Convert.ToString(address.Start), size);
_serialPort.Write(frame1, 0, frame1.Length);
Thread.Sleep(100);
break;
case 4:
byte[] frame4 = XGTCnetMessage.ReadHoldingRegistersMessage(Convert.ToByte(address.Area), "DW", Convert.ToString(address.Start), size);
_serialPort.Write(frame4, 0, frame4.Length);
Thread.Sleep(100);
break;
default:
break;
}
if (this._serialPort.BytesToRead >= 10)
{
buffReceiver = this._serialPort.ReadExisting();
this._serialPort.DiscardInBuffer();
}
if (buffReceiver != null)
{
tempStrg = buffReceiver.Substring(1, buffReceiver.Length - 2);
tempStrg = tempStrg.Remove(0, 9);
return(Conversion.HexToBytes(tempStrg));
}
}
return(null);
}
catch (Exception e)
{
if (OnError != null)
{
OnError(this, new IOErrorEventArgs(e.Message));
}
return(null);
}
}
public int WriteSingleRegister(int id, int startAddress, byte[] values)
{
lock (_async)
{
byte[] frame = XGTCnetMessage.WriteSingleRegisterMessage(Convert.ToByte(id), Convert.ToString(startAddress), values);
_serialPort.Write(frame, 0, frame.Length);
Thread.Sleep(100);
int numBytesRead = 0;
var frameBytes = new byte[5];
while (numBytesRead != frameBytes.Length)
{
numBytesRead += _serialPort.Read(frameBytes, numBytesRead, frameBytes.Length - numBytesRead);
}
var slave = frameBytes[0];
var code = frameBytes[1];
if (code == 0x85)//错误则只需读5字节
{
var errorcode = frameBytes[2];
if (OnError != null)
{
// OnError(this, new IOErrorEventArgs(Modbus.GetErrorString(errorcode)));
}
Thread.Sleep(10);
return(-1);
}
else//正确需8字节
{
numBytesRead = 0;
while (numBytesRead < 3)
{
numBytesRead += _serialPort.Read(frameBytes, numBytesRead, 3 - numBytesRead);
}
Thread.Sleep(10);
return(0);
}
}
}