Thanks for the quick replay, Mike!
In0 on the Control unit and Out0 on the Radio unit are both currently set to Keyer. I'm not using the internal keyer in the RRC, but IIRC that circuit may be how I'm keying CW from my computer and external memory keyer. The USB RTS as PTT and USB DTR as CW are both set to Disabled. Also, COM1 and COM2 are set to Inactive. Can any of these be used?
BTW, on the Radio unit, OUT0 and OUT2 are set to Keyer, OUT1 is set to Baudot-RTTY.
Thanks,
Ron
N6IE