HI Jack-- I run a KPA500 and RRC using the 38,900 baud rate. Works great. Could never get COM2 to run the companion KAT500. Not sure if it was me or the RRC. Gave up after a bunch of troubleshooting and just hit it with 30 watts and it tunes fine. Make sure you use a null modem RS232 cable on COM1.
de dave WB7ELY