D9412GV2/D7412GV2 | Troubleshooting Guide | 3.0 Troubleshooting
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Bosch Security Systems, Inc. | 11/05 | F01U011024B 31
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At the location on the POPIT data bus where the
missing point was removed, short the bus conductors
together. Set your DVM to read resistance. Put the
red lead on one POPIT data bus conductor, and the
black lead on the other.
Refer to
Figure 19 on page 36.
Are the POPEX data wires connected correctly to the
control panel ZONEX IN and OUT terminals?
Fix the incorrect wiring.
• If the DVM shows a short, refer to
TTP48 Noise
on Wire
Set the digital voltmeter (DVM) to VDC. Put the red lead on
the POPEX’s AUX terminal. Put the black lead on the
POPEX’s GND terminal.
on page 102.
• If the DVM shows an open, refer to
TTP47 Open
Wiring on page 100.
If the point expansion technology is powered from an
• If the DVM shows >60 Ω but not an open, there
is excessive wire length or too many devices on
the circuit for the wire gauge used. Perform
voltage drop calculations to determine an
acceptable combination of wire gauge and
length for the current draw of the devices
installed on the circuit.
auxiliary power supply, ensure that the auxiliary power
supply shares a NEGATIVE (-) common reference with
Figure 18the control panel. Refer to on page 31.
Does the DVM read 12 VDC to 13 VDC?
Refer to
TTP51 Device or Module Does Not Have
Power
Replace the POPEX with a known good POPEX. View point
status again.
. on page 111
Disconnect all POPIT data loop wiring from the POPEX.
Connect one known good POPIT to the POPEX. View point
status for the point again.
Is the point still missing?
The POPEX was bad. Reconnect POPIT data loop.
Is the point still missing?
Replace the control panel.
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Figure 18: Point Expansion Technology Powered from Auxiliary Power Supply Wiring Diagram
28
27
26
25
24
23
GND
AUX
IN
OUT
Point Expansion
Technology
Control Panel
12 V Auxiliary
Power Supply
- +
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