VISTA-128BP/VISTA-250BP Installation and Setup Guide
3-10
Using 2-Wire Latching Glassbreaks on Zone 8
Zone 8 can support 2-wire glassbreak detectors. The
zone provides enough standby current to power up to
50 2-wire glassbreak detectors meeting the
requirements listed below.
Compatible Glassbreak Detectors
Use detectors that meet the following ratings:
Standby
Voltage:
5VDC–13.8VDC
Standby
Resistance:
Greater than 20k ohms (equivalent
resistance of all detectors in parallel)
Alarm
Resistance:
Less than 1.1k ohms (see note below)
Alarm
Current:
2mA–10mA
Reset Time:
Less than 6 seconds
NOTES:
• You can use detectors that exceed 1.1k ohms in
alarm, provided they maintain a voltage drop of
less than 3.8 volts in alarm.
• The ADEMCO ASC-SS1 detector has been tested
and found to be compatible with these ratings.
21
22
GLASSBREAK
DETECTOR
ZONE 8
(+)
(-)
LATCHING TYPE GLASS
BREAK DETECTOR LOOP
2000
OHMS
EOLR
Figure 3-13: Wiring Latching Glassbreaks to Zone 8
• The alarm current provided by zone 8
supports only one glassbreak detector in the
alarmed state.
• Do not use other contacts when using
glassbreak detectors on zone 8. Other
contacts may prevent proper glassbreak
detector operation.
To wire 2-wire latching glassbreak detectors to zone 8,
perform the following steps:
Step Action
1 Select 2-wire glassbreak detectors that meet
the requirements stated previously.
2 Connect detectors across zone 8 (terminals
21 and 22). See Figure 3-13.
3 Connect the EOL resistor at the last detector
in the loop across the zone’s terminals. You
must connect the EOL resistor across
the loop wires at the last detector.
Tamper Supervision for the Hardwired Zones
The system can be programmed to monitor for either
an open condition or a short condition of a tamper
switch on zones 1-8. End-of-line supervision is
required for this option.
Wiring a Tamper Switch to Zones 1-8
The wiring of the tamper switch depends on whether
the tamper switch and the sensor are normally open or
normally closed.
• If you are using a normally closed sensor, the
tamper switch must be normally open. Refer to
Figure 3-14 for the wiring configuration.
• If you are using a normally open sensor, the
tamper switch must be normally closed. Refer to
Figure 3-15 for the wiring configuration.
• For the normally closed sensor, program the
zone for trouble on short. For the normally open
sensor, program the zone for trouble on open.
To wire a tamper switch on a hardwired zone, connect
the EOL resistor at the last detector in the loop across
the zone’s terminals. You must connect the EOL
resistor at the last detector for proper operation
of the tamper supervision.
NOTE: For zones with a response type of 9 or 16
(Fire), the tamper selection must be “0” none.
2k EOLR
+
TAMPER
SWITCH
SENSOR
Figure 3-14: Wiring a Normally Closed Loop for
Tamper Supervision
2k EOLR
+
TAMPER
SWITCH
SENSOR
Figure 3-15: Wiring a Normally Open Loop for
Tamper Supervision
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