protected bool CheckModbusHeader(byte[] Message, int MessageLength)
{
int Length = ((int)(Message[4]) << 8) + (int)(Message[5]);
bool IsOK = false;
if (MessageLength < 9)
{
//??EventMBusException(this, new ModBusException(ModBusException.ModBusExceptionCodeEnum.ResponseFormatError));
}
else if (Length + 6 != MessageLength)
{
//??EventMBusException(this, new ModBusException(ModBusException.ModBusExceptionCodeEnum.ResponseFormatError));
}
else if ((Message[7] & 0x80) > 0)
{//skip non FC
ModBusException.ModBusExceptionCodeEnum Code = (ModBusException.ModBusExceptionCodeEnum)Message[8];
//??EventMBusException(this, new ModBusException(Code));
}
else
{
m_FC = Message[7];
m_TransID = Message[0] << 8 + Message[1];
IsOK = true;
}
return(IsOK);
}
protected virtual void OnMBusException(ModBusException.ModBusExceptionCodeEnum Code)
{
// Make a temporary copy of the event to avoid possibility of
// a race condition if the last subscriber unsubscribes
// immediately after the null check and before the event is raised.
MBusException handler = EventMBusException;
ModBusException e = new ModBusException(Code);
// Event will be null if there are no subscribers
if (handler != null)
{
// Use the () operator to raise the event.
handler(this, e);
}
}
protected bool CheckModbusHeader(Int16 TransID, byte FC, byte[] Message, int MessageLength)
{
byte TransId0 = (byte)((TransID & 0xFF00) >> 8);
byte TransId1 = (byte)(TransID & 0xFF);
bool IsOK = false;
if (MessageLength < 9)
{
OnMBusException(ModBusException.ModBusExceptionCodeEnum.ResponseFormatError);
}
else
{
int Length = ((int)(Message[4]) << 8) + (int)(Message[5]);
if (Message[0] != TransId0 || Message[1] != TransId1)
{
OnMBusException(ModBusException.ModBusExceptionCodeEnum.ResponseFormatError);
}
else if (Message[7] != FC)
{
OnMBusException(ModBusException.ModBusExceptionCodeEnum.ResponseFormatError);
}
else if (Length + 6 != MessageLength)
{
OnMBusException(ModBusException.ModBusExceptionCodeEnum.ResponseFormatError);
}
else if ((Message[7] & 0x80) > 0)
{
ModBusException.ModBusExceptionCodeEnum Code = (ModBusException.ModBusExceptionCodeEnum)Message[8];
OnMBusException(Code);
}
else
{
IsOK = true;
}
}
return(IsOK);
}
private void OnMBusException(ModBusException.ModBusExceptionCodeEnum Code)
{
}