Reseting an Allen Bradley SLC 5/03

I just purchased a 10 slot rack with a 5/01 which I want to replace with a my 5/03, which seems to be configured to talk with DH-485. I was told to remove the battery, then short the CAP to reset the processor, so I could then use RS-232 to communicate with it. When ever I do this, it still seems to default to DH-485 mode (the LED flashes every few seconds). What other way can I get this processor to enable serial communications?

Thanks for any help,
Eric Diamond

I forgot to ask, should I be using a regular or null modem serial cable?

Thanks

See this thread and attached PDF

null modem for RS232 port

http://www.plctalk.net/qanda/showthread.php?t=23844

thanks so much, null modem was the problem.

Eric

Your welcome