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Connecting your Graphic Display Annunciator to other systems usually requires an interface between the output signals of the driving system and the graphic display lamps. Many times the
interface is unique to the driving system, so a unique interface has to be designed. In some cases, additional features such as lamp tests, audible alarms, etc., must also be added, which complicates the
interface.
The Graphic Interface Unit (GIU) has been developed to solve the graphic display interface problems. The GIU is a microcontroller-based interface circuit board which is mounted on
the reverse side of the graphic display and performs the interface functions required. Because the GIU is microcontroller based, interface requirements are handled in software. Software ``patches" are
available for most standard interface requirements so your interface can usually be quickly and inexpensively produced. The interface is prepared at the same time as graphic drawings using a Computer-Aided- Design
(CAD) system. When CDT provides you the full-size graphic design for approval, you also receive a summary of the interface. If interface changes are ever required, a replacement PROM can be
furnished quickly because a copy of each interface software shipped is archived.
The GIU will interface up to 128 inputs with up to 128 lamp outputs. Each GIU is expandable to a maximum of 256 inputs and 256 lamp outputs by cascading GIU circuit boards.
An optional RS-232 interface allows the GIU to be controlled by a host computer system.
Closed contact or switching transistor alarm inputs can be either normally closed or normally open. Normally closed inputs can be provided with supervision. Inputs are connected by ribbon cable
or metal-to-metal captive screw terminals on an optional paddle board assembly.
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