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12 C1518M-A (11/02)
OPERATION
The function of the relay unit is to operate relays to control peripheral equipment. Each relay unit processes and executes only commands with
addresses that match those of the relay units.
When power is turned on, the green power LEDs on the front and back of the unit light. The red data LED light on the front continually
flashes on and off at a regular rate (about one-second intervals) until the unit is online and communicating with the CM6800. Once online,
the LED remains ON. If for any reason communication is lost, the LED flashes again until communication is re-established.
MEMORY FEATURE
Although relay groups retain their contact position in the event of a power failure, the unit does not report relay status when requested
after power is recycled. Since the firmware has no battery backed up memory, it does not know the state of the relays and may report
them incorrectly. If a KBD960 keyboard is present on the system, it can contain inaccurate information in the GPI menu.
If the memory feature is disabled, the relays are all placed in a known state at startup. Under these conditions, the state of the relays are
all known and are reported when requested. True relay status shows up on the keyboard display.