RE:Query on the Checksum

RE:Query on the Checksum

Hey,
got a real newbie question how would i go about developing a Frame checksum function in C for an Omron plc (setting up a web based control system using the hostlink commands)
I know this is a bit tedious but I need to communicate to the PLC over a RS232 port WITHOUT usin CX-Programmer.I need assistance in adding the Frame checksum (I wud even accept doing it manually)
As you may have guessed this is a final year project so anyone who is interested in the work let me know and I will get in touch

Any help at all would be great
Regards
Conor

You might want to look at the source code for a hint on how to calculate the FCS.
Sysway (Hostlink) Demonstration Program Visual Basic Sysway (Hostlink) program. Demonstrates the use of Omron's serial protocol. Does automatic FCS calculation. Source Code is included.