Xi. mpu diagnostic leds – Nuvo NV-E6XS User Manual

Page 15

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REFER TO MANUAL

0

1

2

3

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 MPU’s bus transceiver is functioning properly,

one or more of the Diagnostic LEDs will flash continually

every 0.8 seconds. If the MPU’s 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

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