The unit can operate in different modes. Mode selection is done by using the DIP switch located on the board inside the unit. There are two distinct modes of operation:
- Key controlled mode – the ACU will select the transmitter that is keyed and stay there until the other transmitter is keyed.
- Alarm controlled mode – the ACU3 relay is controlled by the alarm state of the transmitters.
Each mode has different options that can be enabled or disabled.