internal override ModbusResponse DeserializeResponse(ResponseBuffer buffer, ModbusRequest request, int timeout)
{
ModbusResponse result = null;
while (result == null ||
result is ModbusCommErrorResponse responseCommErrorMessage &&
responseCommErrorMessage.ErrorCode != ModbusCommErrorCode.ResponseTimeout)
{
if (buffer.Count > 0)
{
errorBuffer.Add(buffer[0]);
buffer.RemoveAt(0);
}
buffer.Read(timeout);
try
{
while (buffer[0] != 0x3a)
{
errorBuffer.Add(buffer[0]);
buffer.RemoveAt(0);
buffer.Read(timeout);
}
}
catch
{
return(new ModbusCommErrorResponse(ModbusCommErrorCode.ResponseAsciiStartError, errorBuffer.Concat(buffer), request));
}
result = base.DeserializeResponse(buffer, request, timeout);
}
if (result is ModbusCommErrorResponse responseCommError)
{
result = new ModbusCommErrorResponse(responseCommError.ErrorCode, errorBuffer.Concat(responseCommError.ReceivedBytes), request);
}
else
{
var asciiEnd = buffer.Read(2, timeout);
if (!asciiEnd.SequenceEqual(new byte[] { 13, 10 }))
{
return(new ModbusCommErrorResponse(ModbusCommErrorCode.ResponseAsciiEndError, buffer, request));
}
if (errorBuffer.Count > 0)
{
RaiseUnrecognized(buffer.Channel, errorBuffer.ToArray());
errorBuffer.Clear();
}
}
return(result);
}
private bool IsErrorLRC(ResponseBuffer buffer, int messageLength, ModbusRequest request, int timeout, out ModbusResponse responseMessage)
{
byte lrc = 0;
foreach (var b in Read(buffer, 0, messageLength, timeout))
{
lrc += b;
}
lrc = (byte)(-lrc & 0xff);
if (lrc != Read(buffer, messageLength, timeout))
{
responseMessage = new ModbusCommErrorResponse(ModbusCommErrorCode.ErrorLRC, buffer, request);
return(true);
}
else
{
responseMessage = null;
return(false);
}
}
internal override ModbusResponse DeserializeResponse(ResponseBuffer buffer, ModbusRequest request, int timeout)
{
ModbusResponse result = base.DeserializeResponse(buffer, request, timeout);
while (result is ModbusCommErrorResponse responseCommErrorMessage &&
responseCommErrorMessage.ErrorCode != ModbusCommErrorCode.ResponseTimeout)
{
errorBuffer.Add(buffer[0]);
buffer.RemoveAt(0);
result = base.DeserializeResponse(buffer, request, timeout);
}
if (result is ModbusCommErrorResponse responseCommError)
{
result = new ModbusCommErrorResponse(responseCommError.ErrorCode, errorBuffer.Concat(responseCommError.ReceivedBytes), request);
}
else if (errorBuffer.Count > 0)
{
RaiseUnrecognized(buffer.Channel, errorBuffer.ToArray());
errorBuffer.Clear();
}
return(result);
}