Xantech / Dayton Audio / Sonance multi-zone amps

Hi all,
Does anyone know the pinouts for that DB15/HD15 port on the back off the Xantech MX-88 line, for RS232 control. They supply a DB9 to DB15 cable with the unit. I have two units and one cable. The cable is discontinued (PN 05913665).

The pinout in the manual (for the DB15 connector) is (a) for the expansion (outbound, secondary) DB15 port, not the primary control port (b) it doesn’t work (I bought a cable and DB15/HD15 connector). Called “Nice” the new parent of Xantech. they couldn’t help because its all discontinued.

My attempt was pin 2 (Tx DB9) to pin 11 (Tx DB15), pin 3 (Rx DB9) to pin 13 (Rx DB9) and pin 5 (ground DB9) to pin 12 (common DB15).

I also tried reversing the Rx Tx – but to avail.

Can anyone come to my rescue? Pic from manual with notes attached for someone smarter than me to decode!

Thanks.

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