Hardwire Zones; Double Balanced Zones - ADEMCO VISTA-20PS Series Installation And Setup Manual

Installation and Setup Guide

Hardwire Zones

Normally Open Zones/ Normally Open EOLR Zones
1. Connect open circuit devices in parallel across the
loop; for EOLR zones, connect the EOLR across the
loop wires at the last device.
2. Enable normally open/EOLR zones using Zone
Programming mode, "Hardwire Type" prompt.
Normally Closed Zones/Normally Closed EOLR Zones
1. Connect closed circuit devices in series in the high (+)
side of the loop; for EOLR zones, connect the EOLR in
series following the last device.
2. Enable normally closed/EOLR zones using Zone
Programming mode, "Hardwire Type" prompt.
Double-Balanced (V20P/PS only): Connect as shown
below (resistor provided for one device).
IMPORTANT: Double-balanced zones provide zone
tamper protection, and should be used as burglary zones
only. Do not use double-balanced zones as fire zones.
Zone Doubling (V20P/PS only): Connect as shown below
(resistors provided).
2-6
12 13 14
TAMPER
2k 2k
CONTACTS
TAMPER
2k
2k
CONTACTS
2k
2k
ZONE 3 ZONE 4

Double Balanced Zones

10 11
ZONE 2
3k
ZONE 10
6.2k
Zone Doubling
Notes
• EOLR: If the EOLR is not at the end of the loop,
the zone is not properly supervised and the
system may not respond to an "open" on the zone.
• Zone 1 is intended for EOLR only.
U L
For UL commercial burglar alarm
installations, use EOLR zones.
Zone Doubling (VISTA-20P/PS only):
This feature provides two hardwired normally
closed zones for each standard hardwired zone
connected to the control's terminals (but does not
increase the total number of zones supported by
the control). If enabled (Zone Programming mode,
"Hardwire Type" prompt, option "3"), hardwire
zones are automatically paired as follows:
Zone Paired with zone
2 10
3 11
4 12
5 13
6 14
7 15
8 16
Do not use zone doubling for fire zones.
NOTE: A short across the EOL (i.e., at terminal)
on either zone of a zone-doubled pair or on a
double-balanced zone causes a tamper condition
(displayed as CHECK plus zone numbers)
.