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6.0 Troubleshooting
Table 18:
Troubleshooting
Symptom
Multiplex point appears as
missing at the keypads.
Points intermittently
appear as missing.
One or more multiplex
points remain in trouble
or alarm when all devices
appear normal.
Faulted multiplex points
do not generate alarms or
troubles as programmed.
Bosch Security Systems, Inc. | 12/15 | F01U034973-03
Diagnosis
Multiplex point is not connected
to MUX bus. Check wiring.
Multiplex point not
programmed.
MUX bus wires not connected to
D8125MUX.
Noise problem on MUX bus loop.
Intermittent shorts or opens on
the MUX bus wires.
The MUX bus is open, shorted or
grounded.
Opens, shorts, or grounds at
various points in the MUX bus
can cause alarms and troubles
depending on multiplex point
programming.
Control panel's reset hook
switch is down when event was
generated.
Two multiplex points are
programmed for the same
address.
D8125MUX | Installation and Operation Guide |
Remedy
Verify that a multiplex point programmed for the
missing multiplex point is connected to the MUX
bus wiring. Make sure its polarity is correct.
Check the Green Operation LED on the
D8125MUX. It should be flashing. An LED OFF
indicates no power, a D8125MUX PCB failure, or
an EEPROM failure on the D8125MUX.
Verify the missing point's programming with the
Multiplex Point Programmer.
Verify the MUX bus wires are connected to the
correct terminals on the D8125MUX. Verify
correct polarity.
Make sure MUX bus wires do not run over
fluorescent lighting or near large AC power
transformers or conduits.
Verify the wiring to the multiplex points and the
D8125MUX does not have nicks or cuts in the
insulation that can short to nearby conduit.
Make sure wires are tight under terminals of
multiplex points and on the D8125MUX.
Remove the sensor wiring from the multiplex
point and meter it for continuity.
There should be no more than 100 of
resistance, plus the EOL resistance. If you read
less than the EOL resistance look for shorts in
the wiring.
With the wires for the sensor removed, use a
meter to check them for continuity to ground.
A ground before the EOL resistor on a multiplex
points' sensor loop is interpreted as a short. If
the multiplex point is programmed for trouble
on short, a ground before the EOL causes the
multiplex point to send a trouble report.
The control panel ignores events generated
while the programming or reset switch is down.
Multiplex points programmed for the same
address do not function correctly. Check the
programming of each multiplex point with the
multiplex point programmer.
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