Linear MPX-303 Owner's Manual

MPX

SUPERVISED
EMERGENCY
TRANSMITTER

Operation Instructions

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DESCRIPTION

The MPX is a compact, light-weight, wireless transmitter that can
be activated by squeezing both side bars. When activated, the
MPX sounds an internal beeper, lights its LED and signals an
alarm to a supervised security receiver.

The unit can be easily concealed, and is water and shock resistant.
For continuous emergency security, it can be clipped on a belt, or
be worn suspended from a neck chain. A belt clip and neck chain
are packaged with the unit.

NOTE: The MPX is only water resistant, DO NOT IMMERSE
THE UNIT IN WATER.

The transmitter is powered by two self-contained type DL2032 3-volt
lithium batteries (included). The batteries are monitored by Linear’s
custom supervisor circuit. When the battery voltage gets low, low
battery reports are automatically transmitted to the receiver every
hour for a minimum of seven days.

This unit incorporates Linear’s proprietary “MegaCode” circuit that
provides MPX transmitters with over one million security codes.
Each MPX transmitter has been pre-programmed at the factory to
one of the million codes. The transmitter will retain its
pre-programmed code even with low or no batteries. The
transmitter is designed to transmit two unique signals; one for low
battery, one for alarm.

MPX MPX with Belt Clip

MPX with Neck

Chain

FIGURE 1 To program transmitter into receiver. Follow the

receiver’s instructions to set it into a program or learn mode. Press
the two side bars of the transmitter for about two seconds to send
a signal. Verify that the signal was received and that the transmitter
was properly entered into the receiver’s memory. Set the receiver
into a sensor test mode. Activate the transmitter again and verify
that the receiver accepts the alarm transmission.

SQUEEZE BOTH SIDES
FOR ABOUT TWO SECONDS

BEEPER WILL
SOUND AND LED
LIGHTS

RECEIVER
LEARNS
TRANSMITTER
ID CODE

FIGURE 4 Battery replacement. The MPX uses two coin cell

lithium/manganese dioxide batteries. Duracell type DL2032 are
recommended for replacement. Remove the battery door to
access the batteries. Install the new batteries with the plus sides
toward the outside of the unit.

CAUTION: To prevent battery damage, do not allow sides of
batteries to touch, or place batteries together on a metal
surface.

TURN BATTERY DOOR
WITH COIN TO UNLOCK

INSTALL BATTERIES
WITH PLUS SIDE OUT

BATTERY TYPE
DL2032 OR
EQUIVALENT

FIGURE 2 To trigger an alarm. To send an alarm to the

receiver, both side bars of the MPX must be pressed
simultaneously for a

minimum of two seconds. The two-button
feature provides protection against false alarms. When the unit is
transmitting, the red LED will light.

PRESS AND HOLD BOTH
TRANSMITTER SIDE BARS

LED WILL
LIGHT

FOR AT LEAST TWO SECONDS
TO TRIGGER AN ALARM

ALARM

SIGNAL

BEEPER WILL SOUND

TO RECEIVER

PRESS PRESS

FIGURE 5 Installing neck chain. The MPX belt clip can be

removed and replaced with the neck chain supplied. The neck
chain is held to the transmitter with the chain retaining plate.

NECK CHAIN
FITS IN SLOT

REMOVE BELT CLIP

INSTALL CHAIN
RETAINING PLATE

FIGURE 3 Low battery signal. Under normal conditions, the

two lithium batteries that power the MPX should last from 2 to 3
years. When the batteries get low, the unit will automatically send
a low battery signal to the receiver every hour for a minimum of
seven days. When
the transmitter
sends the low
battery signal, the
LED will blink and the
internal beeper will
sound descending
tones. Pressing
both side bars will
still send an alarm
signal, even when
the transmitter has
low batteries.

LINEAR LIMITED WARRANTY

This Linear product is warranted against defects in material and workmanship for twelve (12) months. The
Warranty Expiration Date is labeled on the product. This warranty extends only to wholesale customers who
buy direct from Linear or through Linear’s normal distribution channels. Linear does not warrant this product
to consumers. Consumers should inquire from their selling dealer as to the nature of the dealer’s warranty, if
any. There are no obligations or liabilities on the part of Linear corporation for consequential damages

arising out of or in connection with use or performanc e of this product or other indirect damages with
respect to loss of property, revenue, or profi t, or cost of removal, installation, or reinstallation. All implied

warranties, including implied warranties for merchantability and implied warranties for fitness, are valid only until
Warranty Expiration Date as labeled on the product. This Linear Corporation Warranty is in lieu of all other

warranties express or implied.

For warranty service on Linear equipment return product, at sender’s expense to:
Linear Corporation Service Department
2580 Pioneer Avenue, Suite C
Vista, CA 92083

IMPORTANT !!!

Linear radio controls provide a reliable communications link and fill an important need in portable wireless
signalling. However, there are some limitations which must be observed.

For U.S. installations only: The radios are required to comply with FCC Rules and Regulations as Part 15

devices. As such, they have limited transmitter power and therefore limited range.

A receiver cannot respond to more than one transmitted signal at a time and may be blocked by radio signals

that occur on or near their operating frequencies, regardless of code settings.

Changes or modifications to the device may void FCC compliance.
Infrequently used radio links should be tested regularly to protect against undetected interference or fault.
A general knowledge of radio and its vagaries should be gained prior to acting as a wholesale distributor or

dealer, and these facts should be communicated to the ultimate users.

Copyright © 1993 Linear Corporation 208937 A

WHEN TRANSMITTER HAS
LOW BATTERIES:

BEEPER WILL SOUND
DESCENDING TONES

LED WILL
FLASH

LOW BATTERY

SIGNAL IS SENT

TO RECEIVER