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Installation Instructions

for the MX938i

Ceiling Mount Multiplex

PIR Intrusion Detector

1.0

Specifications

• Input Power:

Connects directly to the Multiplex Bus of the
Control Panel and optionally to an auxiliary
12 VDC source.

• Current Draw:

2-Wire:
LED Off:

< 350 µA draw on Mux Bus.

In Alarm; LED On: 2 mA draw on Mux Bus.
4-Wire:
LED Off:

< 350 µA draw on Mux Bus.;
0 mA draw on Aux. power.

In Alarm; LED On: < 350 µA draw on Mux Bus;

3 mA draw on Aux. power.

•  Standby Power:

There is no internal standby battery. Connect
to DC power sources capable of supplying
standby power if primary power fails. For each
hour of standby time needed, 350 µAh are
required. 

For  UL Listed Requirements, four

hours (1400 µAh) minimum are required.

  Coverage:

360° by 60 ft. (18.3 m) diameter coverage

when mounted on 8 to 18 ft. (2.4 to 5.5 m)
high ceilings. Pattern consists of 64 zones
grouped into 16 barriers, with one additional

zone looking straight down from the unit

(sabotage). Each barrier is 30 ft. (9.2 m) long

and 4.4 ft. (1.3 m) wide at 30 ft. (9.2 m).

Choice of two optical modules depending
on ceiling height. 

For UL Listed

Requirements, the coverage is 360° by 54 ft.
(16.5 m) when mounted 10 to 13 ft. (3.1 m to
4.0 m) using the AR8-13 array and when
mounted from 15  to 18 ft. (4.6 m to 5.5 m)
using the AR13-18 array.

• Sensitivity:

Selectable for Standard, Intermediate or High.

• Tamper:

A tamper condition is signaled through the
Multiplex Bus and displays at the system
keypads.

• Temperature:

The storage and operating temperature
range is -20°F to +120°F (-29°C to +49°C).
For UL Listed Requirements, the
temperature range is +32°F to +120°F (0°C
to 49°C).

• Control Panel

Requirements:

DS7400, DS7400X, or DS7400Xi Control
Panel with a DS7430 or DS7436 Multiplex
Expansion Module. DS7400 and DS7400X
require ROM version 1.07 or greater. The
9000 Series Control/Communicators with
D8125MUX Module installed.

• Patents:

This device is covered under one or more of
the following U.S. patents: #4,764,755,

#5,268,668, and #5,302,941.

2.0

Control Panel Programming

Refer to the multiplex programming section of your Control Panel
Reference Guide for information on programming multiplex zones
for this device.

3.0

Mounting

       Avoid

Direct or
reflected

sunlight

Moisture

Moving objects

Hot or cold air

directed onto

sensor

Mounting Outdoors

Pets or animals

Rear Wire

Entrance

Terminal

Strip

Interface

Pins

Mounting

Slots (4)

Wire

Tie-Downs (2)

Mounting Base

Walk Test/Alarm

LED Indicator (3)

Sensitivity

Jumper

Cover

Tamper

Terminal

Strip

Signal

Gain

Jumper

LED

Operation

Jumper

Top View of Enclosure

with Cover Removed

Module Tabs (2)

AR8-13

Address
Switches

Optical Module

with Cutaway to

show Circuit

Board detail

IMPORTANT

The mounting surface should be solid and vibration free
(i.e., drop tiles should be secured if the area above the
tiles is used as an air return for HVAC systems).

• Select a location that is most likely to intercept an intruder moving

across the coverage pattern. The recommended mounting height
range is 8 to 18 ft. (2.4 to 5.5 m).

• Remove the cover by turning counterclockwise.
• Remove the base from the enclosure by pressing the two

enclosure release tabs inward while lifting the enclosure away
from the base.

Hint:

Slightly rock the enclosure side-to-side during removal,
to overcome the friction caused by base-to-enclosure
terminal pins.

• Route wiring as necessary to the rear of the base and through

the center hole.

Be sure all wiring is unpowered (de-energized) before
routing.

• Securely attach the base. Depending on local regulations, the

base may be directly surface mounted using anchors, mollies
or wing-nuts, or may be mounted to standard four-inch octagonal
and square electrical boxes.

NOTE:

The MX938i base will not completely cover a four-inch
square box. Where aesthetics are important, a four-inch
octagonal box is recommended.

Summary of Contents for MX938I

Page 1: ...Control Communicators with D8125MUX Module installed Patents This device is covered under one or more of the following U S patents 4 764 755 5 268 668 and 5 302 941 2 0 Control Panel Programming Refer to the multiplex programming section of your Control Panel Reference Guide for information on programming multiplex zones for this device 3 0 Mounting Avoid Direct or reflected sunlight Moisture Movi...

Page 2: ... only Disable the LED when Walk Testing is complete To disable the LED place the jumper in the OFF position If the detector has AUX Power supplied the LED operation may be left ON during normal use 5 2 Sensitivity Mode Standard Sensitivity Recommended setting for maximum false alarm immunity Tolerates environment extremes on this setting but requires the largest amount of intruder motion to achiev...

Page 3: ...11 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 1 2 3 4 5 6 7 8 ZONE POINT ADDRESS SWITCH NUMBER SWITCH ON CLOSED 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 1 2 3 4...

Page 4: ...e test Performing a zone test on a regular basis assures an alarm output prior to arming the system Excessive handling of the mirror surfaces may lead to performance degradation 9 0 Coverage Patterns Refer to the mirror module and pattern drawings for masking information Before masking be sure the chosen mirror surface is the correct one When removing masking remember many adhesives will either de...

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