The ANN-I/ O is an LED driver module that can be used in a
wide variety of applications including as an interface with the Fire Alarm
Control Panel (FACP) to drive most customized graphic annunciators. It comes in
a plastic enclosure that may be mounted inside a custom annunciator or accessory
cabinet and can drive up to 40 LEDs. The ANN-I/ O and the FACP communicate over
a two-wire serial interface employing the ANN-BUS communication for- mat. An
additional two wires are used for 24-volt DC power. A single four-conductor
unshielded cable may be used for both power and data communications.