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REFER TO MANUAL
0123
DIAGNOSTIC CONTROL
-INPUT--OUTPUT-
MUTE
UNIT ON
+12V G
N.O. G
Page 13
The MPU Diagnostic LEDs serve several functions.
One function is the lowest assignable address. This
is an aid in sequentially assigning the appropriate
address on each keypad. When the system is turned
on, and none of the keypads have been addressed,
the diagnostic LED 0 should flash every 0.8 seconds.
This means the first DIP switch on the keypad should
be set in the down position, and the other three should
be in the up position. This sets that keypad for zone
1.You will then see diagnostic LED 1 begin to flash.
This is indicating the next available zone setting, which
is the second DIP switch in the down position and
the other three in the up position. The next available
address would then be zone 3, which is the first two
DIP switches in the down position and the third and
fourth DIP switches in the up position, which is
indicated by diagnostic LED 0 and LED 1 flashing
simultaneously. As each keypad is set, the LEDs will
continue to cycle to the next address, with the flashing
LEDs indicating which of the four address DIP switches
should be in the down position (Fig. 15).
Important Note: Once a keypad has been addressed,
it should be left hooked up to the system. This will
keep the diagnostic LEDs accurately displaying
the next available address.
If the MPUs bus transceiver is functioning properly,
one or more of the Diagnostic LEDs will flash continually
every 0.8 seconds. If the MPUs bus transceiver sees
a short-circuit on the bus, all four LEDs will flash ON
twice every 0.8 seconds.
If the MPU is not processing normally due to a
malfunction of the micro controller, all four LEDs will
flash ON three times every 0.8 seconds.
Fig. 15: Diagnostic LEDs
A steadily flashing LED indicates a
properly functioning MPU. If all four
LEDs are flashing twice every 0 .8
seconds, there is a short-circuit that
is most often a result of improperly
wired Cat-5 cables. If all four LEDs
flash three times every 0.8 seconds,
there is a malfunction of the micro
controller. If this should occur, please
contact NUVO for proper warranty
service.
XI. MPU Diagnostic LEDs