Following the introduction of Universal Controller parts for the Extended Controller and Extended Reserve Controller Director, Honeywell introduced this limited version of the original processor card for the Data Hiway Port. This card will not work in the Extended Controller or ERCD.

The original version of this processor, the 30731832-002 is still available from WPC, and can be used in the Extended Controller and ERCD in addition to the DHP.

This card contains the microprocessor that drives the DHP. A single red LED on the card edge indicates that the procesor is running.

WPC has a special-built processor card tester that us used on all of our processor cards prior to our regular system test. This microprocessor-controlled tester executes a series of assembly-language programs designed to verify the logical states of the card's digital circuitry. Once all circuits on the card have been verified as operating correctly, the card is system-tested for a minimum 48-hours in our DHP test bed. Not even the original manufacturer tests their processors this thoroughly.

Troubleshooting Tip: Failure of the processor card is among the most common failures in the DHP. When toubleshooting a failed DHP, verify proper processor operation first.