I am trying to serial control the Xantech via this HAI device. All wiring tests well. Getting 5.7VDC on TX and 0 across RX connected. Baud rate at 9600. !1SS2+ is my test code in system but no change in software test or uploaded GUI. I've tried /CR...forums and tech docs show no need for null. Firmware across all subsystems are latest...I am at a loss. IR for same device are controlling perfect over iPhone within same program.

Am I missing something?