Figure 3-15. Polling Loop Connections Using One 4297 Extender Module; Figure 3-16. Polling Loop Connections Using Multiple 4297 Extender Modules - Honeywell ADEMCO VISTA-120 Installation And Setup Manual

VISTA-120 Installation and Setup Guide
Polling Loop Limitations
Twisted-pair is recommended for all wire runs.
No more than 64mA may be drawn on any
individual wire run.
When a star configuration is used, the total
length of all wire runs combined cannot exceed
1220m (610m if you are using unshielded wire
in conduit or shielded wire).
IMPORTANT NOTE: If the installation exceeds or
deviates from these parameters, refer to the application
note on the Honeywell website for additional
information. To access the application note:
1. Go to the honeywell.com/security website
2. Click the Honeywell Security & Custom Electronics
link.
3. Click the Commercial link.
4. Click the Documentation link.
5. Click the V-Plex Application Note.
The built-in polling loop has the following limitations
that must be observed:
The maximum allowable current drain from the
polling loop is 128mA. If device drain totals more
than 128mA, a 4297 Polling Loop Extender Module
is required.
The 4297 Polling Loop Extender Module may be
used to provide additional polling loop current, to
extend the polling loop wire run, and/or to provide
individual, electrically isolated polling loops. Refer
to the 4297 Polling Loop Connection Figures 3-15
and 3-16 later in this section.
Use of more than 50 DIP switch devices can
greatly impact the panel's ability to respond to
a change in status in a timely manner.
DIP switch devices that affect response time
include 4278EX, 4275EX, and 4190WH.
DO NOT use the 4197 Polling Loop Extender
Module with the VISTA-120.
•
Regardless of current drain, no more than 64 DIP
switch devices or 119 serial number devices can be
connected to the polling loop. Installations that
require up to 119 zones using DIP switch devices
will require the use of zone expanders (4190WH
and/or 4208U), which allow more than one zone on
each expander. Otherwise, a 4297 Polling Loop
Extender must be used.
Make certain to include the total current drain
on the polling loop when figuring the total
auxiliary load on the panel's power supply
(see Calculating the Battery Size Needed
later in this section.
3-8
Notes: - Do not use the 4197 module with VISTA-120.
- Refer to 4297 instructions for more detailed installation information.
Input Polling Loop
- - -
VISTA-120 RPM RPM
Figure 3-15. Polling Loop Connections Using One
4297 Extender Module
Notes: - Do not use 4197 module with VISTA-120.
- Refer to 4297 instructions for more detailed installation information.
The Limits shown below supercede the limits described in the 4297 instructions.
- Do not connect 4297 modules in series.
Input Polling
Loop
VISTA-120
Figure 3-16. Polling Loop Connections Using
Multiple 4297 Extender Modules
Polling Loop Supervision
An overload on the polling loop is indicated by a trouble
on its supervisory zone (997) and reports as a trouble
condition only, even if the system is armed. As such, it
should be assigned zone type 05 if annunciation is
desired.
If a device on the polling loop fails (the panel cannot
"see" that device), the partition (or partitions) that use
that device will display a trouble condition for all zones
associated with that device. If the panel is armed when
a device fails, the zones associated with that device will
cause an alarm on the corresponding partition(s).
A trouble on Zone 997 will not prevent a
partition from being armed, as long as all
polling loop zones on that partition are
bypassed.
Maintenance Signal Support
The control monitors maintenance signals from certain
smoke detectors (5192SD, 5192SDT). Maintenance
signals are triggered when a detector gets dirty. The
detector should be cleaned or replaced. If a detector
maintains a high or low sensitivity condition for longer
than 24 hours, the control sends a dialler report
(trouble message for non-Contact ID reports; event
code 385 or 386 for Contact ID reports), makes an event
log entry, and displays HSENSxxx or LSENSxxx at the
keypads (xxx = zone number).
Power for 4297
12V at (32mA + extension loop drain)
Extension Polling Loop
4297
- - -
RPM
MODULE
Extension Loop #1
4297 - - -
RPM RPM
Extension Loop #2
4297 - - -
RPM RPM
Extension Loop #8
- - -
RPM RPM
4297
Up to 8 modules may be connected in parallel.
Extension loops will be electrically isolated if
blue jumper on each 4297 is left in tact.
Combined Input and Extension Loop Limits:
- No more than 120 devices combined.
RPM