Emax

OK- So I was being lazy.....

I found all the docs for the adapters you have.....

ON the Redcom- you have jumper on 17-18 I assume?

I would try all of the following:

Pin 7 to USB-Comi 7 (by itself)

Pin 7 to Comi 6&7 tied together

Pin 7 to USB-Comi 8 (by itself)

Pin 7 to Comi 8&9 tied together

Pin 7 to Comi 7&8 tied together



On RS232 for some "null modem" connections you have to do similar-
Tie DTR and CTS/RTS and sometimes CD together to get communications  
working.....

Regards.
Ted