The 4-way programmable relay card is a compact remote I/O device for the ZXa and ZXe intelligent multi protocol fire alarm control panels. This device, along with other remote I/O devices, the repeater units and the external printer provide a complete range of peripheral devices to further enhance the functionality and expandability of the ZXa and ZXe systems.  The 4-way relay card consists of 4 relay outputs built on a single printed circuit board. Each output relay provides single pole double throw (SPDT) switching action for other locally powered equipment. The form C relay contacts are designed to switch resistive loads of up to 1A/24V ac/dc.

The 4-way relay card connects to the ZXa or ZXe control panels via the RS485 peripheral port (Port D).  An RS485 communication card must be fitted in the ZXa or ZXe control panel for that purpose.   The "Auto-Learn" facility in the ZXa or ZXe control panels will automatically add each relay output to the list of relay outputs in the panel. Each of these relays can be assigned to any zone on the system and can be individually programmed for NORMAL, DELAYED, or DOUBLE-KNOCK operation. The 4-way relay card requires a 24V to 28 Vdc external power supply to operate. Power may be taken from the auxiliary power supply output on the Zxa or ZXe panel or any other suitable DC supply of suitable voltage and current rating.  The RS485 peripheral address is set via an onboard DIP switch and other peripherals such as repeaters can be daisy chained together on the same line. Up to a maximum of thirty-one, four-way programmable relay cards can be connected to a peripheral bus. This number is reduced when any other peripheral devices are used on the same bus.