I've just completed setting up my 8 ant x 2 port Antenna Genius ant switch with my two radios. The AG is mounted in a waterproof box at the base of the tower.
The AG Port A (Flex6500) is controlled using CAT6 cable from my router & Port B (Elecraft K3) is controlled from the K3 ACC socket using BCD (Binary Coded Decimal).data.
It all works seamlessly from within the AG small window switching my 80M dipole, my Optibeam 40/30M rotatable dipole & my 3-EL SteppIR between either radio. On the Flex the band changing of the SteppIR is carried out automatically from one of the Flex USB ports but at the moment for use with the K3, the SteppIR band changing is manual.
I use the Flex in line with an Elecraft KPA500 amp & the KAT500 tuner, bypassing the Flex internal tuner. I also have an Elecraft 144MHz Transverter working with the Flex.
My congratulations to the Flex & 4O3A guys for making it all so easy to setup & configer. The hardest part was soldering the 5 wires in the two DE15S connectors for the Port B BCD data cable!