Control is done by means of an RS-232C connection to a four pin RJ11 modular jack on the back of the unit (an adapter to a standard DB9 connector is supplied by Broadcast Tools with the unit). Serial port parameters should be set to 9600 baud rate, no parity, 8 data bits, 1 stop bit, CR/LF termination.

A total of 24 GPO outputs are supported, with the relays appearing as GPO lines 1-8 and the open collector outputs as lines 9-24. All 24 'PIP' inputs are supported as GPI devices.

The SS 16.4 should be configured to use 'Mix' mode and to have 'PIP' mode enabled. This can be done by setting DIP switches SW24-5, SW24-6 and SW24-8 to ON.

Operation in 'multidrop' mode is not supported.