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:
3
µ
A (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.
