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VISTA-128B Installation Instructions

7-2

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 (24 and 25). 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 7-1.

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.

Maximum Polling Loop Wire Runs

Wire Gauge Max. Length

#22 gauge 650 feet

#20 gauge 950 feet

#18 gauge 1500 feet

#16 gauge 2400 feet

When running polling loop wires, they must not be run within 6" of AC power, telephone, or

intercom wiring. Since 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.)

4190

RPM

4278

PIR

Polling loop rating:

128mA maximum.

POLLING LOOP

21 22 23 24 25

4192SD

SMOKE

TO RIGHT LOOP

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

1 2 ... 43 44 45 46 47 48 49 50 51 52 53 ... 251 252

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ADEMCO VISTA-128B Guia de preparacion Pagina 48