Linear MDT Installation Instructions

MegaCode Series
MDT, MDT-2, MDT-4
DIGITAL TRANSMITTERS

Installation Instructions

(800) 421-1587 www.linearcorp.com
STEP 1
Receiver Installation. Connect the receiver to the
garage door operator as described in the receiver's Installation
Instructions. Apply power to the operator before programming.
CONNECT RECEIVER TO GARAGE DOOR OPERATOR
STEP 3
Program receiver. Momentarily press the receiver's
program button (channel one or two). The red programming LED
will light if there's room in the receiver's memory for another
transmitter. The LED stays on for about 5 seconds. A transmitter
must be entered while the LED is on . Press the desired
transmitter button. The LED will flicker indicating that the receiver
has accepted the transmitter.
NOTE: Be sure to press the receiver program button for less than
2 seconds.
WARNING! Door operator will not activate when the receiver
is being programmed from the transmitter, but the door
operator will activate the next time the transmitter is activated
after programming.
NOTE: The programming LED also monitors radio signals entering
the receiver. It is common to see an occasional blink from the LED.
The LED will also light when any transmitter tuned to the receiver's
frequency (programmed into the receiver or not) is activated.
DESCRIPTION
The MegaCode series of digital transmitters are wireless radio controls
designed for use with automatic garage door and gate openers. The
MegaCode radio format provides unparalleled security. The system
can be programmed to more than a million different codes.
MegaCode transmitters and receivers do not contain a typical "coding
switch" as in Linear's standard digital receivers. Each transmitter is
pre-set at the factory to a unique code. The receiver is programmed by
sending a signal to it from the transmitter(s) that are going to be used
with it. This stores the transmitter's code into the receiver's memory.
The receiver will retain its memory even without power. The receiver
will activate only from these "memorized" transmitters. Please refer to
the receiver's instructions for maximum transmitter capability.
The transmitters are powered from two Type 2032 lithium "button cell"
MDT
batteries. When the batteries get low, the bright red LED light on the
transmitter will start to dim as the unit is activated. When the red LED
no longer lights when the transmitter is activated, the batteries should
be replaced.
STEP 2A
MDR/MDRNR/MDR2 Program button and LED
Location. Locate the program button and LED on the side of the
receiver case.
LED WILL LIGHT
WHEN RECEIVER
CHANNEL 2 IS READY
PROGRAMMING
BUTTON
MDT - Single-channel transmitter with a button on the front and the
top (both buttons perform the same function).
MDT-2 - Three-channel transmitter with two buttons on the front and
one button on the top (each button performs a separate function).
MDT-4 - Five-channel transmitter with four buttons on the front and
one button on the top (each button performs a separate function).
STEP 2B
Location. Locate the program button and LED on the back of the
receiver case.
CHANNEL ONE
PROGRAMMING
BUTTON
PROGRAMMING
LED
CHANNEL TWO
PROGRAMMING
BUTTON
STEP 4
WHEN RECEIVER
transmitter used with the receiver. Be sure to press the receiver's
IS READY, PRESS THE DESIRED
TRANSMITTER BUTTON
program button each time a new transmitter or a different
transmitter button on a multi-button transmitter is pressed.
If the LED doesn't come on when the receiver's program button is
pressed, the receiver's memory is full. Use the erase function (Step 7)
to remove transmitters form the receiver's memory.
CHANNEL 1
PROGRAMMING
BUTTON
RECEIVER LED
WILL FLICKER
AS TRANSMITTER
IS ENTERED INTO
MEMORY
MDT MDT-2
M D R M / M D R M 2 P r o g r a m b u t t o n a n d L E D
Add additional transmitters. Repeat Step 3 for each
THEN PRESS TRANSMITTER BUTTON
PRESS CHANNEL 1 OR CHANNEL 2
PROGRAM BUTTON FIRST
MDT-4
WITH MULTI-BUTTON
TRANSMITTERS PRESS
THE DESIRED BUTTON