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Section 7: 2-WIRE POLLING LOOP EXPANSION
(ZONES 009 -087)
This section provides the following information:
• Polling loop overview
• Common characteristics of polling loop zones
• Wiring RPM devices to the polling loop
• Addressing RPM devices
• Programming polling loop zones
• Checkout procedure for polling loop zones
Polling Loop Overview
You can expand the system from the basic 8 zones to up to 87 zones using the
built-in 2-wire polling loop. Each device that is connected to the polling loop has
the capability to communicate with the panel about its status. These devices are
called RPMs (Remote Point Modules). The polling loop provides both power and
data to the RPM zones, 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 using a 4297 Polling Loop Extender
Module).
Refer to the list of compatible devices at the end of this section.
Common Characteristics of Polling Loop Zones
Polling loop zones have the following characteristics:
•
Must use RPM (Remote Point Module) devices
•
Supervised by control panel
•
Individually assignable to one of 8 partitions
•
Individually assignable to bell outputs and/or aux. relay
Wiring/Addressing RPM Devices
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 as shown in Figure 9.
Although each polling loop device is wired in parallel, each device has its own
unique zone number (or group of zones if it is a zone expansion device). On
some devices, this is determined by the setting of DIP switches. Other devices
have a built-in unique serial number which must be "learned" into the control as
the zone number desired. Set up the polling loop as follows:
1. Run wires to each device on the polling loop. No individual wire run
may exceed the lengths given in the table to follow. In addition, 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 4000 ft (2000 ft. if using unshielded wire in conduit or shielded
wire). Twisted pair is recommended for all normal wire runs.
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Страница 206: ... 196 NOTES www PDF Zoo com firealarmresources com ...