SIO12-3 is an input and output unit used in alarms in ARX to connect alarm sensors. SIO12-3 can be connected to the LCU9016III sub-controller directly on the DAC buses or via the SIO bus on the master control panel. SIO12-3 has 12 inputs and three outputs. The 12 inputs are programmable and can operate normally open or normally closed, double balanced with any resistance values (standard 2K2 ohm). Triple balancing is also possible when covering alarms from detectors are used. All outputs are programmable, each with two relay-equipped and one supervised transistor output. SIO12-3 is equipped with an internal buzzer. The SIO12-3 board can handle current loops on all inputs such as loop-connected glass detectors and fire detectors. Inputs 1-3 can also handle extra current with a maximum load of 200mA per input. All inputs and outputs have LED indicators to simplify installation and troubleshooting. The SIO12-3 can either be connected directly to a door bus or to the alarm system's SIO bus.