Device Troubleshooting - Interlogix CDC4 Installation And Programming Manual

Chapter 5: Troubleshooting

Device troubleshooting

Door controller
Condition
The controller is not
communicating with readers or
expanders
The readers or expanders appear
to be going offline and online
(indicated by keypad or expander
fail LED's
Zone goes into alarm while the
area is unset
Remote expanders — Models ATS1201, ATS1210,
ATS1211, ATS1220
Condition
The Tx LED on the expander is not
flashing
Tx and Rx LEDs are not operating
The expander appears to be going
off-line and on-line (indicated by
"Expander fail" on a LCD keypad)
116
Possible cause
The system data bus line may be connected incorrectly.
Reader or expander numbers to be polled may not be
programmed, or may not match the addresses set on the
units.
There is an earth loop in cabling.
The system data bus line may be connected incorrectly.
The termination may be incorrect. TERM links may not have
been removed where necessary. See "Bus termination" on
page 28.
The zone is wired incorrectly causing a tamper condition
(open circuit or short circuit) instead of active condition. EOL
resistors may be installed incorrectly.
Possible cause
The DIP switches may be incorrectly set (the address
recorded on the expander may be incorrect and therefore
polling to the expander is not being acknowledged).
The system data bus cable may be connected incorrectly.
The expander is not programmed to be polled.
No power or low power.
The system data bus cable may be connected incorrectly or
the power supply is faulty (mains or battery).
The termination may be incorrect. See "Bus termination" on
page 28.
CDC4 Door Controller Installation and Programming Manual