Visonic DISC MCW User Manual

DISC MCW

Wireless PowerCode Digital Ceiling Mount PIR
detector

1. INTRODUCTION

The DISC MCW is the smallest 360° ceiling mounted passive
infrared detector presently marketed. The DISC MCW is a
microprocessor-controlled wireless digital PIR detector, designed
for easy installation.

The DISC MCW provides a nearly conical pattern of maximum

10.5 m (36 ft) diameter, when installed on a 3.6 m (12ft) ceiling.
The advanced True Motion Recognition™ algorithm (patented)

allows to distinguish between the true motion of an intruder and
any other disturbances which may cause false alarms.

False alarms caused by environmental disturbances are virtually
eliminated with alternate polarity pulse counter signal processing
and a low-noise pyroelectric detector.

The DISC MCW includes the following features:

• Provides multiple beams coverage.

• Incorporates a fully supervised PowerCode transmitter.

• Sophisticated frequency domain digital signal processing.

• Programmable motion event counter.

• Very low current consumption

• Tamper switch for detector opening.

• White light protection.

• Elegantly styled, sturdy case.

2. SPECIFICATIONS

Detector Type: Dual element low-noise pyroelectric sensor.

ELECTRICAL
Internal Battery: 3V Lithium battery, type CR-123A. For UL

installations, use Panasonic, Sanyo or GP only.

Nominal Battery Capacity: 1400 mA/h.
Battery Life (with LED on): Typically over 3 years.
Battery Power Test: Performed immediately upon battery

insertion and periodically after every several hours.

FUNCTIONAL
True Motion Event Verification: 2 position selector - 1 (OFF) or

2 (ON) motion events.

Visual Indications:

LED Lights for about 3 seconds upon transmission of alarm &

tamper messages and upon motion detection in the walk test
mode.
LED Flashes during the power-up stabilization period, or after
restoring (pressing) the tamper switch.
LED does not light upon transmission of supervision
messages.

Rearm Timer: Rearms the detector 2 minutes after the last motion
detection. The detector reverts to the initial state if there is no
movement during 2 minutes. The timer is disabled in the walk test
mode.

WIRELESS
Frequency (MHz): 315 (U.S. version) or other frequency according

to local requirements.
Transmission Sequence: 3 data bursts at variable / random

intervals within 3 seconds.

Encoding: Over 16 million possible combinations.
Total Message Length: 36 bits.
Supervision Message: Signaling at 60-minute intervals (U.S.

version).

MOUNTING
Ceiling Mounting: Maximum mounting height 3.6 m (12 ft)

ENVIRONMENTAL
RFI Protection: >10 V/m up to 2000 MHz.
Operating Temperatures: -10
Storage Temperatures: -20
Compliance with Standards: Designed to meet FCC Part 15.

PHYSICAL
Dimensions (diam. x H) : 86 x 24 mm (3-3/8 x 15/16 in).
Weight: 64 grams (2 oz)
Color: White

PATENTS

U.S. Patents 5,693,943 z 6,818,881 (other patents pending).

Installation Instructions

Figure 1 – External View

°C to 50°C (14°F to 122°F).

°C to 60°C (-4°F to 140°F).

.

Figure 2 - DISC MCW PIR Coverage Pattern

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3. INSTALLATION

3.1 Mounting

The DISC MCW PIR is installed on the ceiling.
The maximum installation height is 3.6m (12 ft).

A. Mount the unit so that the expected motion of an intruder is

perpendicular to the detector and not into the detector.

Be sure to install the detector on a stable ceiling, to avoid

vibrations.

Note: Passive infrared detectors are sensitive to changes in

infrared energy caused by an object moving across the unit's
field of view.

Detection of changes in infrared energy depends on the

amount of infrared energy transmitted by the moving object,
and the temperature difference between the object and the
background. Because of this the PIR may fail to respond
under certain temperature and background conditions, in
which the temperature difference is too small.

B. The DISC MCW is extremely immune to air turbulence and

RFl interference.

However, to minimize possible

COVER

false alarms, it is highly
recommended that you avoid
aiming the detector at heaters,
sources of light, or windows

BASE

subjected to direct sunlight.
Avoid mounting the DISC MCW
in locations where air drafts
could flow from the ceiling or
from close walls. Also avoid
running wiring close to high
power electrical cables.

Figure 3 - Removing the

Cover

C. Hold the unit base as shown in Figure 3. Rotate the cover

counter clockwise until it stops. Separate the cover from the
base.

Note: If the cover does not separate easily from the base,
insert a 1/8" screwdriver between a tab (on the cover) and a
slot (on the base). Lower the screwdriver handle until the base
separates from the cover and removes easily.

D. Mount the base (equipped with the

printed circuit board) in the
location selected for optimum
coverage. Using the two mounting
holes at the back of the base
fasten the unit firmly to the
mounting surface to avoid
possible vibrations. (Figure 4).

Line up the 3 tabs on the cover

with the 3 slots on the base. Fit
the cover over the base. Rotate
the cover clockwise until it stops.

Figure 4 – Installing the

Cover

3.2 LED Functions

After battery insertion and rear cover closure, the LED flashes for
2 minutes approximately until the detector stabilizes.

After stabilization, the detector enters automatically walk-test
period of 15 minutes (see section 3.6 Walk Test below). In this
mode the LED lights and the unit sends an RF alarm signal on
every detection (regardless of LED jumper position).

After the walk-test period, the LED operates according to the LED
jumper setting, as follows:

LED

Jumper

Position

ON

OFF

LED lights during alarm transmission.
LED does not light

LED Activity in "Normal Mode"

during alarm transmission.

After the first 15 minutes, following every motion detection and
alert transmission, the detector disarms itself to save battery
power. It rearms (reverts to the ready state) if there is no
subsequent detection during the following 2-minute period.
Therefore, if you want to check the detector, you have to exit the
room for at least 2 minutes and then enter the room.

3.3 Battery Insertion

Insert battery (see Figure 5) – Verify proper polarity.
Caution!
Dispose of used battery according to manufacturer's instructions

3.4 Setting the Pulse Counter

The DISC MCW is equipped with a selectable alternate polarity pulse
counter which can be set to count two consecutive pulses with
opposite polarity, before activating the alarm relay. Pulse count signal
processing requires that the moving person will cross both elements
of the dual detector before the alarm relay is activated.
This provides maximum protection against false alarms caused by
environmental disturbances.

PULSE COUNTER

SELECTOR

LED

SELECTOR

TAM PE R
SWITCH

WALK-TEST &

ALARM LED

DETECTOR

MOUNTING

HOLE

RELAY

WIRING

KNOCKOUT

BATTERY

MOUNTING

HOLE

Figure 5 - Printed Circuit Board

2 pulse setting

The two pulse logic may be selected only when the DISC MCW is
installed in temperature controlled locations.

1 pulse setting

This setting actually disables the pulse counter. It should be used
when maximum detecting sensitivity or fast "catch" performance are
of highest importance, such as in high security installations.

3.5 Enrolling

In order that the PowerMax family control panels will identify the
detector signal, perform enrolling as described in the PowerMax+
or PowerMax Pro installer guide, respectively.

3.6 Walk-Test

After closing the cover and after the detector stabilization period
(2 minutes approximately), the detector enters a 15 minute walk­test mode. In this mode, the LED flashes each time a motion is
detected, regardless of LED jumper settings and the detector
transmits the occurrence of each event.

Walk across the far end of the coverage pattern in both
directions. The indicator should light for 3 seconds approximately
each time your motion is detected.

Important: Instruct the user to perform walk-test at least
once a week to assure proper detector's function.

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