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2-WIRE POLLING LOOP EXPANSION (Zones 10 through 87)

General Information The following table summarizes polling loop expansion characteristics.

Applications • Built-in 2- wire polling loop interface allows the number of

zones to be expanded from the basic 9 zones to up to

87 zones using various Remote Point Modules (RPMs).

See ADVISORIES below.

• The polling loop provides power to sensors and serves

as communication path between the panel and sensors.

• Refer to the list of compatible devices at the end of this

section.

RPM Address (ID) • Each sensor must be assigned a unique address ID

number (from 10-87) before being connected to the

polling loop. Care must be taken to assign unique ID

numbers to each sensor in order to allow the panel to

supervise and provide console status indications for

individual sensors.

• Most RPMs have DIP switches to set their addresses.

The 4939SN and 4191SN have preprogrammed serial

numbers which must be "learned" by the control via the

#93 menu programming mode.

Connections • Connect RPM sensors to terminals 24 & 25.

• Sensors can be connected to a single run, or groups of

sensors may be connected to separate wire runs without

affecting the panel's ability to supervise individual

sensors.

• Follow the wiring instructions provided with individual

sensors. Be sure to observe sensor polarity when wiring.

• The maximum allowable wire run length between the

panel and the last sensor on a given wire run is shown in

the table below.

Maximum Polling Loop Wire Runs

Wire Gauge Max. Length

#22 gauge (0.64mm) 650 feet (198m)

#20 gauge (0.8mm) 950 feet (290m)

#18 gauge (1.0mm) 1500 feet (457m)

#16 gauge (1.3mm) 2400 feet (732m)

Note: Twisted pair recommended

for all normal wire runs.

IMPORTANT: The maximum combined polling loop run is 4000' (1220m). If

using shielded wire, the maximum is 2000' (610m). If longer wire runs are

needed, a 4297 Loop Extender Module must be used (see instructions included

with the 4297).

Intercom Interference If an intercom system is being used, the polling loop wires must be as far from the

intercom wiring as possible (minimum 6" [150mm]). If this spacing cannot be

achieved, shielded wire must be used. If this is not done, interference on the

intercom system might occur. Also note that the maximum total wire length

supported is cut in half when shielded wire is used.

Advisories The built-in polling loop has two limitations that must be observed. First, the

maximum allowable current draw from the polling loop is 64mA. Refer to the

POLLING LOOP CURRENT DRAW WORKSHEET (found in the POWERING THE

SYSTEM section of this manual) for current draws of various polling loop devices.

Second, regardless of current draw, no more than 64 devices can be connected

to this loop. Installations which require up to 87 zones will require the use of

4190WH RPMs (which offer 2-points – a right and a left loop – per device) or the

use of a 4297 (which offers another polling loop supporting an additional 128mA)

Make certain to include the total current drawn on the polling loop in the

AUXILIARY CURRENT DRAIN WORKSHEET (see POWERING THE SYSTEM

section) when figuring the total auxiliary load on the panel's power supply.

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ADEMCO 4140XMPT2 Manual de usuario Pagina 17

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