The EVAC BOARD is an extension unit to the IDA8-System. Each EVAC BOARD will provide those systems with 32 additional alarm inputs. Each input is monitored and can be programmed to trigger a digital audio message into a specific zone or group of zones. The EVAC BOARD is linked to the System units through an RS232 /RS485 monitored serial link and input to the PDC socket on the rear of the IDA8