Interlogix CDC4 User Manual

Chapter 5: Troubleshooting
116 CDC4 Door Controller Installation and Programming Manual
Device troubleshooting
Door controller
Condition
Possible cause
The controller is not
communicating with readers or
expanders
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 readers or expanders appear
to be going offline and online
(indicated by keypad or expander
fail LED’s
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.
Zone goes into alarm while the
area is unset
The zone is wired incorrectly causing a tamper condition
(open circuit or short circuit) instead of active condition. EOL
resistors may be installed incorrectly.
Remote expanders — Models ATS1201, ATS1210,
ATS1211, ATS1220
Condition
Possible cause
The Tx LED on the expander is not
flashing
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.
Tx and Rx LEDs are not operating
No power or low power.
The system data bus cable may be connected incorrectly or
the power supply is faulty (mains or battery).
The expander appears to be going
off-line and on-line (indicated by
“Expander fail” on a LCD keypad)
The termination may be incorrect. See “Bus termination” on
page 28.

Interlogix CDC4 Specifications

General

Brand	Interlogix
Model	CDC4
Category	Controller
Language	English