Polling Loop Supervision; Figure 7-3. Polling Loop Connections Using Multiple Extender Modules - ADEMCO VISTA-128B Installation And Setup Gude

VISTA-128B Installation and Setup Guide
Notes:
CONTROL
PANEL

Figure 7-3. Polling Loop Connections Using Multiple Extender Modules

Note: The input loop limits stated in Figure 7-2 apply to Figure 7-3 as well.

Polling Loop Supervision

A short on the polling loop is indicated by a trouble on its supervisory zone and reports as a
trouble condition only. As such, a polling loop should be assigned zone type 05 if
annunciation as a trouble condition 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, and the zone is programmed as a
burglary type, that device will cause an alarm on the corresponding partition(s). Otherwise
the zone will generate a trouble condition.
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.
7-6
- Do not use 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.
Input Polling
Loop
Combined Input and Extension Loop Limits:
- No more than 119 devices combined on all loops
- To calculate the maximum wire run allowed on each extension loop:
4297
4297
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.
1. Determine the total wire length of all input loops combined.
2. Subtract this number from 6400 ft. (3200 ft. for shielded cable or
unshielded cable in conduit).
The result is the maximum wire run length for each extension loop.
Extension Loop #1
- - -
RPM RPM
Extension Loop #2
- - -
RPM RPM
Extension Loop #8
- - -
RPM RPM
Extension Loop Limits:
Each individual loop has the
same limits as the input loop.