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Alarm Inputs: 128 discrete inputs from closed contacts, open collector gate, or serial data, RS-232 (optional). Can be expanded    in increments of 64 to 256 inputs maximum.

Input Configuration: Inputs can be normally open or normally closed, jumper selectable. Supervision is available when using the normally closed input configuration.

Input Connections: Inputs are available on ribbon cable or optional metal-to-metal captive screw terminals. The optional screw terminals are mounted on a ``paddle" board which can be mounted next to or within 10 feet of the GIU. (Convenient mounting is in the rear of the annunciator enclosure.)

Serial Interface: Optional RS-232 serial interface is available on the circuit board. Protocol uses a simplified instruction set.

Control Inputs: Control inputs are provided on board for the following functions. Each function is energized by a single contact, normally open switch connection to ground (or common).

• Lamp test: illuminates all lamps
• Alarm silence: silences the audible alarm (if connected) and changes flashing lamps to solid (when programmed)                           
• Alarm acknowledge: changes flashing lamps to steady (when programmed). Other operations available.
• Alarm reset: extinguishes alarm indications (when programmed). When reset, normal operation calls for system to recheck inputs for presence of alarm signals. Realarm will occur if alarms are still present.
• Silence with ringback: silences a trouble condition but will realarm when the trouble condition is repaired, informing the operator that silence must be reset.

Realarm Feature: Normally programming requires the audible alarm to sound whenever a new alarm condition is received.

Lamp Outputs: 128 discrete lamp driver outputs. Each output is capable of driving up to 4 lamps simultaneously. Any color lamp can be connected to any output.

Lamp Control: Relationship of input conditions to lamp illumination is controlled by the one-chip microcontroller. Each operation is controlled by a preprogrammed operational scenario. Contact the factory for the description of each of the currently available scenarios. Custom programming is available to meet your unique application. Contact the factory for details.

Audible Alarms: Three separate audio outputs with volume control are available. Each output is programmable. Current  outputs are

• Steady tone: 1000 Hz.
• Interrupted tone: 1000 Hz., 50% duty cycle. 1      cycle per second.
• Warble tone: 1000 Hz. center freq., 250 Hz deviation.

Power Requirements: 12VDC, 1.8 amps. (max) provided by external UL-listed, wall-mounted transformer. Backup battery optional.

Size: GDI circuit board;  6" W x 12" L (approx. 1-1/4-inch component height) Paddle board terminal strip, 64 terminals each, 2 required for 128 inputs; 3" W x 8" L

Weight: Circuit board 1 lb.