Problem solved. RealSimGear instructions for com1 vs com 2 allocation in the config mapping are backwards. Hardware mapping is driven by the 1st set of entries for the 530 and the 1st set of entries for the 430 in the configuration mapping file. So must be set to #1 and #2 respectively when both units coexist to make the 530 com1/nav1 and the 430 com2/nav2. Thankyou LesOReilly for triggering further thought and not to believe everything you are told by those that should know.
AVSIM is a free service to the flight simulation community. AVSIM is staffed completely by volunteers and all funds donated to AVSIM go directly back to supporting the community. Your donation here helps to pay our bandwidth costs, emergency funding, and other general costs that crop up from time to time. Thank you for your support!
Donate to our annual general fundraising goal. This donation keeps our doors open and providing you service 24 x 7 x 365. Your donation here helps to pay our bandwidth costs, emergency funding, and other general costs that crop up from time to time. We reset this goal every new year for the following year's goal.