Control is done by means of an RS-232C connection to the RS-232 port on the unit. Serial port parameters in RDAdmin should be set to 57600 baud rate, even parity, 8 data bits, 1 stop bit and no terminator.

The ACU-1 should be set to use factory default settings. This can be done by simultaneously pressing buttons 1 and 8 on the front panel of the unit for at least one second.