SpiderAlert MCT/IR-252 WP S User Manual

DE2411U 1

MCT/IR-252 WP S

Resettable Dual RF & IR Waterproof Transmitter User Guide

1. INTRODUCTION

The MCT/IR-252 WP S is a miniature, water-proof, resettable,
microprocessor controlled, personal transmitter designed for use in
the SpiderAlert signaling network. The transmitter has two buttons,
used for reporting three different events: Panic (large button), Assist
(small button) User Defined (by clicking on the two buttons
simultaneously). The alarm events are supposed to be
acknowledged and reset by the person who responds to the alarm
message by holding a magnet close to the pendant. In the case that
an event is not acknowledged, a No Response message is sent. In
addition to the above-mentioned events, the transmitter also sends
low-battery, tracking and supervision messages (when defined in
DIP switch). The transmitter transmits coded UHF signals and
pulsed infrared signals simultaneously, thereby allowing the target
receiver to accurately determine the specific point at which
transmission took place in multi-storey buildings.

Besides the regular alert mode, in which an alert message is
transmitted only once, the transmitter can be set to two additional
modes – MESSAGE CYCLE and REPEATED MESSAGE
CYCLING. In the message cycle mode, panic, and assist messages
are automatically repeated three times, and a no-response
message follows if the message has not been acknowledged. In the
cycle repetition mode, a sequence of three alarm messages
followed by a no-response message (one cycle) is repeated 5
times, unless the message is acknowledged sooner. The time
interval between these messages is determined by the DIP
switches (para. 3.1). When a Panic message is transmitted after an
Assist message has been initiated, the repeated messages will be
Panic messages instead of Assist messages.

When holding an external magnet
close to the unit, either from
underneath or on top, near where
the pushbuttons are positioned
(fig. 1) the repetitive message
transmissions will stop and an
acknowledge message will be
sent.

Fig. 1 – Resetting Transmitter

Once the button is
depressed, the LED lights
and after approximately one
second the message is
transmitted.

It is important not to cover
the LED during the period of
time after pressing the
button. When keyed into
transmission, the transmitter
transmits its unique factory

LARGE
BUTTON

SMALL
BUTTON

BATTERY
COVER

HOLES
FOR
CHAIN

Figure 2 – MCT/IR-252 WP S
programmed, randomly selected 24-bit digital ID code. There are over
16 million code possibilities, so for all practical purposes no two
transmitters will have the same ID code. The dual-technology alert
transmissions made by the MCT/IR-252 WP

S are directed at
SpiderAlert receivers. These receivers are strategically located all
over the surveillance area, to pick up alert transmissions and report
the ID code of the transmitter whose signal was picked up.

SpiderAlert system

SLC-5UPS

Controller

PC

SR-520

RF+IR

receiver

SpiderBus

MCT/IR-252 WP S

Figure 3 – Application Configuration

Reporting is accomplished via a two-wire bus routed to the
SpiderAlert Local Control Unit SLC-5, that collects and transfers all
data to the SpiderAlert main computer automatically displaying the
holder’s name and exact location. All units are supplied with a
chain, to be worn around the neck as a pendant transmitter.

2. SPECIFICATIONS

Frequency (MHz): 315 or 868.
IR Transmission Range: 14 m (46 ft) max. with unobstructed line

of sight (para. 5.2).

RF Transmission Range: 30-40m indoors.
Transmitter ID: 24-bit digital word, over 16 million combinations,

pulse width modulation

Message length: 36 bit.
Transmission Duration: Limited by timer to approx. 2 seconds.
Power Supply: 3V lithium battery Panasonic CR2450 or

equivalent.

Current Consumption: 3µA (standby), 10 mA (transmission).

Battery Life: 3 years for typical use. 1 year when using automatic

tracking.

Battery Capacity: 500mAh
Low Battery Threshold: 2.5 VDC
Operating Temperature: 0° to 50°C (32° to 122°F).
Dimensions: 39x60x18mm (1-7/16x2-3/8x5/8 In.).
Weight: 40 g (1.4 oz).
Color: Violet Transparent.
Compliance with Standards: FCC ID: GSAWTIR201, CANADA:

1467 102 270
Patents: U.S. patent 5,661,471

3. TRANSMITTER MESSAGES

3.1 Internal DIP Switch Functions

The internal DIP switches functions and their default positions (set
by the manufacturer) are detailed in table 1.

To change DIP switch settings, remove the battery as detailed in
para. 4.1 and set the required DIP switch positions. Position the
battery in place and secure the battery cover.

Table 1 - Internal DIP Switch Functions

SW # Description Default

1 Supervision ON/OFF (*) OFF
2 Cycling ON/OFF (**) ON
3 Repeat Cycling ON/OFF (***) ON
4 Retransmission Periods (****) OFF
5 Retransmission Periods (****) OFF
6 Automatic Tracking ON/OFF (*****) OFF

*Supervision type
ON - the supervision messages are transmitted every 60 minutes.
OFF– No supervision messages are transmitted.
**Message Cycling
ON – 3 repetitive PANIC messages are transmitted and then a NO-

RESPONSE message is transmitted.
OFF – a single PANIC message is transmitted.
***Repeat Cycling
ON – The Message Cycle is repeated 5 times.
OFF – The cycle is not repeated.
**** Retransmission Periods

(Switches 4 & 5): This is the period of
time between transmission of repeated messages (see DIP switch
2 and 3) and between the tracking messages (see DIP switch 6)
when these options are enabled.

2 DE2411U

SW 4 SW 5 Period

OFF OFF 30 sec.
ON OFF 1 min.
OFF ON 2 min.

ON ON 4 min.
*****Automatic Tracking
ON – The automatic tracking feature is enabled.
OFF – The automatic tracking feature is disabled.

3.2 Events Messages

In addition to the transmitter's 24-bit ID, a transmission always

includes an alert code. A low-battery code will be automatically
added to the transmitted data if the battery voltage is below 2.5
VDC. An LED lights steadily during every transmission for 1 sec.

No. Event

Basic Address PANIC
Basic Address +1 ASSIST
Basic Address +2 USER
Basic Address +3 ACKNOWLEDGE
Basic Address +4 NO-RESPONSE
Basic Address +5 TEST (or Tracking)

4. MAINTENANCE AND TESTING

4.1 Battery Installation

A. Place a coin in the slot

of the battery cover.

B. Turn the coin anti

clockwise as far as
you can.

Figure 4 – Placing Coin

C. The cover will become

slightly raised.

D. Remove the cover.
E. Take out the battery

and position the new
battery with the
positive (+) side up.

F. Reposition the battery

cover.

RAISED BATTERY
COVER

Figure 5 – Removing Battery Cover

G. Place a coin in the slot of the battery cover and turn clockwise as

far as you can until you hear a click confirming closure.

4.2 Testing

A. Stand 3 m (10 ft) away from the receiver and hold the transmitter

with its two infrared LEDs directed at the receiver. Make sure your
fingers stay clear of the infrared LEDs.

B. Depress the transmit pushbutton and verify that the transmitter's

indicator LED lights.

IMPORTANT! The user should be warned that the infrared (IR)
signal will be transmitted only if the infrared LEDs are kept
exposed, free to radiate into the surrounding space. Infrared
radiation will be blocked if the transmitter is cupped in the palm of
the hand or if transmission is attempted from a pocketed
transmitter. Whenever the infrared source is blocked, the
SpiderAlert network will have to rely on radio signal only, with
lesser accuracy in locating the transmitting unit.

C. Observe that the receiver LED responds to detection: receiver's

indicator LED should light steadily if only the RF signal is
captured, but should flash if both RF and IR signals are captured.

D. Verify that the ID code of the transmitter in use has been

registered by the SpiderAlert head-end computer.

E. Operate the transmitter from various locations within the area

covered by the receiver to determine "dead" spots, where
transmission may be obstructed by walls and large objects, or
affected by structural materials.

5. MISCELLANEOUS COMMENTS

5.1 Comments on IR Signaling

Attaining the maximum IR reception range depends mainly on direct line
of sight between the transmitter and the receiver. Nevertheless, certain
environments allow the signal to reach the receiver in a roundabout path,
by reflection or refraction of the infrared radiation. Tiled floors
(uncarpeted), walls, smooth ceilings (not too high) can reflect IR signals
reasonably well, allowing them to be received even when the radiating
source is pointed away from the receiver. With good indirect reflection
path, a range of 5 - 6 m (15 - 18 ft) is expected (with poor reflection, the
range gets even shorter). The user is therefore strongly advised to point
the transmitter directly at the nearest receiver or, if the location of the
nearest receiver is unknown, to press the transmit button several times
while pointing the transmitter in different directions. It is strongly
recommended not install IR receiver outdoors, facing direct sunlight, or
near fluorescent lamps, to prevent interference to IR reception.

The installer is encouraged to test the reception range in the various
zones and to install additional receivers if necessary.

5.2 Comments on Radio Signaling

Some limitations have to be considered.

A. Receivers may be blocked by radio signals occurring on or near

their operating frequencies, regardless of the code selected.

B. A receiver can only respond to one transmitted signal at a time.
C. Wireless equipment should be tested regularly (at least once a

week) to determine if there are sources of interference and to
protect against faults.

Warning: Changes or modifications to this unit not expressly
approved by the party responsible for compliance could void
the user's authority to operate the equipment.

5.3 Compliance with Standards

The digital circuit of this device has been tested and found to comply
with the limits for a Class B digital device, pursuant to Part 15 of the FCC
rules. These limits are designed to provide reasonable protection against
harmful interference in residential installations.This equipment
generates, uses and can radiate radio frequency energy and, if not
installed and used in accordance with the instructions, may cause
harmful interference to radio and television reception. However, there is
no guarantee that interference will not occur in a particular installation. If
this device does cause interference which may be verified by turning the
device off and on, the user is encouraged to eliminate interference by
one or more of the following measures:

• Re-orient or re-locate the receiving antenna.

• Increase the distance between the device and the receiver.

• Connect the device to an outlet on a circuit different from the

one which supplies power to the receiver.

• Consult the dealer or an experienced radio/ TV technician.

The 868 MHz model of this device complies with the European Council
Directive EMC 89/336/EEC & 92/31/EEC and bear the CE mark and
certification.

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©VISONIC TECHNOLOGIES LTD. 2004 MCT/IR-252 WP S DE2411U (Rev. 0, 01/04) Warranty enclosed separately