Figure 7-1: Polling Loop Connections To The Vista-128B; Figure 7-2: Polling Loop Connections Using One 4297 Extender Module - ADEMCO VISTA-128B Installation And Setup Gude

Polling loop rating:
128mA maximum.

Figure 7-1: Polling Loop Connections to the VISTA-128B

The 4297 Polling Loop Extender may be used to provide additional polling loop current, to
extend the polling loop wire run length, and/or to provide individual electrically isolated
polling loops. Refer to Figures 7-2 and 7-3, to follow.
DO NOT use the 4197 Polling Loop Extender module with the VISTA-128B .
Notes: - Do not use the 4197 module.
- 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.
CONTROL
PANEL
Input Loop Limits:
- 128mA max. No more than 64mA
on any individual wire run.
- No individual wire run may exceed:
Gauge Length
#22 650 ft.
#20 950 ft.
#18
1500 ft.
#16
2400 ft.
- Total length of all wire runs combined cannot
exceed 4000 ft. (2000 ft. if using unshielded
wire in conduit or shielded wire).

Figure 7-2: Polling Loop Connections Using One 4297 Extender Module

21 22 23 24 25
+
-
4190
RPM
4192SD
SMOKE
4278
PIR
Input Polling Loop
4297
- - -
RPM
RPM
MODULE
Extension Loop Limits:
- Same as for the input polling loop.
Combined Input and Extension Polling Loop Limits:
- No more than 119 devices combined.
- Total length of all wire runs on all loops combined can-
not exceed 6400 ft. (3200 ft. if using unshielded wire in
conduit or shielded wire)
Section 7 - 2-Wire Polling Loop Expansion
TO RIGHT LOOP
Extension Polling Loop
- - -
RPM RPM
7-5