cti2500 comms with a siemens mp377

need communications setup for siemens mp377 to talk to a cti 2500 via rs422, anyone done this?

Is a CTI 2500 similar to a TI 505 PLC ?
If so, you can chose the driver "Simatic 500/505 serial" in WinCC Flexible.

CTI 2500 PLC's "speak" the same protocol as the TI505 PLC, so the same driver should work. The baud rate for the serial port is set with dip switches on the CPU board.
I think you will have to pull the processor to access the switches.