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Figure 3-12: Wiring a Normally Closed Sensor Loop for Tamper Supervision
Figure 3-13: Wiring a Normally Open Sensor Loop for Tamper Supervision
Installing V-Plex Devices
The polling loop provides both power and data to the V-Plex devices, and is constantly monitoring the status of all zones
enabled on the loop. The maximum current draw of all devices on the polling loop cannot total more than 128mA (unless
the system uses a 4297 Polling Loop Extender Module).
Devices that can be programmed via either DIP switches or the built-in unique serial number must be set for serial
number mode operation.
All devices on the polling loop must be wired in parallel to the [+] and [-] polling loop terminals of the control panel (28
and 29). You can wire from device to device, or have multiple branches connected directly to the control panel in a star
configuration. If a module is using optional aux power, do not connect the [ - ] polling loop terminal to the device. Use
the ground from the power source.
1. Do not run polling loop wires within 6” of AC power, telephone, or intercom wiring. The polling loop is carrying
data between the control panel and the devices, interference on this loop can cause an interruption of this
communication. The polling loop can also cause outgoing interference on the intercom or phone lines. If this
spacing cannot be achieved, shielded wire must be used. (Note that the maximum total wire length supported
is cut in half when shielded wire is used.)
2. The IS25000SN and DT7500SN can be programmed as a “Smart Contact” in Zone Programming. This
prevents those PIRs from displaying faults during the disarmed state.
3. Twisted-pair is recommended for all wire runs.
4. No more than 64mA may be drawn on any individual wire run.
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• The 4190SN right loop must not be used, and the left loop must be EOLR-supervised.
• The 4297 must be powered from the VISTA-128FBPT/VISTA-250FBPT Auxiliary Power Output.
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