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In

stallation I

n

stru

c

ti

o

ns for MDR 

Seri

e

s

L

in

ear P/N: 21

018

8 A

M

a

te

rial: 20

 Lb.

 Mea

d Bo

nd

Si

ze:

 8 1/

2 x 11

"

In

k:

 PM

S 548

 (Blue

/G

ra

y)

FRONT S

IDE

OF 2

MegaCode Series

MDR, MDR2, MDRNR, MDRM, MDRM2

DIGITAL RECEIVERS

Installation Instructions

Moore-O-Matic: (800) 835-5666

DESCRIPTION

The MegaCode series of digital receivers are wireless radio
controls designed for use with automatic garage door and gate
openers. The MegaCode radio format provides unparalleled
security. The transmitter and receiver can be programmed to more
than a million different codes.
MegaCode receivers and transmitters do not contain a typical
“coding switch”. 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 transmitters code into the receiver’s memory. The
receiver will retain its memory even without power. The receiver
will activate only from these “memorized” transmitters. Each
M egaCode  receiver can  remember a maximum of 10
transmitters.
Receivers are normally powered with 24 volts AC/DC from the garage
door or gate operator. Two-channel receivers provide wire
connections to activate the operator’s light or control other devices.

MDR - Single-channel external receiver with relay output.
MDRM - Single-channel internal receiver (fits in MOM’s “Z” series
operators) with solid state output.
MDRNR - Single-channel external receiver for use on MOM’s “X”
series operators.
MDR2 - Two-channel external receiver with relay outputs.
MDRM2 - Two-channel internal receiver (fits in MOM’s “Z” series
operator) with solid state output on channel one and relay output
on channel two.

STEP 1A

MDR/MDRNR/MDR2 Three-terminal Operator

Installation. Hold receiver up to back of operator. Connect
Terminals 1, 2 & 3 on the receiver to Terminals 1, 2 & 3 on the
operator.

STEP 1B

MDRM/MDRM2 Z Series Operator Installation.

Loosen operator terminal screws. Install receiver into operator
“pocket”. Connect Terminals 1, 2 & 3 on the receiver to Terminals
1, 2 & 3 on the operator.

STEP 1C

MDR/MDR2 Two-terminal Operator Installation.

A Moore-O-Matic Model TF524 step-down transformer must be
used to power the receiver when connecting to a two-terminal
operator or one that supplies other than 24V. Install the screws
supplied into the brass terminals on the receiver. Connect the
transformer wires to Terminals 1 & 3 (polarity not important).
Connect receiver Terminals 1 & 2 to the two operator terminals
(polarity not important).

STEP 2

MDR2/MDRM2 Two-channel Receiver Installation.

Connect the receiver to the operator as described in the previous
step. The channel-two pigtail wires can be connected to the
operator’s light toggle terminals or to an external device.

STEP 3

Optional Receiver Mounting Bracket. If the receiver

isn’t going to be mounted directly to the operator terminals, an
optional mounting bracket is supplied. It can be installed three
ways onto the MDR or MDR2 case. Screw the bracket to a wall
or stud and snap the receiver onto it.

STEP 4A

MDR/MDRNR/MDR2 Program button and LED

Location. Locate the program button and LED on the side of the
receiver case.

1

2

3

1

2

3

CONNECT
RECEIVER
DIRECTLY
TO OPERATOR

MATCH UP
TERMINAL
NUMBERS

1

2

3

COMMON

GROUND

RELAY

24-VOLTS

RADIO

POWER

RECEIVER FITS INTO
BACK OF OPERATOR

BRASS
TERMINALS
FIT TO 
TERMINALS 
1, 2 AND 3

ANTENNA

1 2 3

1

2

3

COMMON

GROUND

RELAY

24-VOLTS

RADIO

POWER

1

2

3

INSTALL 3 SCREWS

WIRE TRANSFORMER TO TERMINALS 1 & 3

USE MOORE-O-MATIC
#TF524 24VAC, .5VA
TRANSFORMER

WIRE TERMINALS 1 & 2 TO OPERATOR 
PUSHBUTON TERMINALS

CONNECT ORANGE TO LIGHT TERMINAL

GROUND (#1)

BROWN ORANGE

RED

RELAY

COMMON

RELAY

NORMALLY

OPEN

RELAY

NORMALLY

CLOSED

"X" SERIES

OPERATOR

Z133

OPERATOR

CONNECT BROWN TO COMMON GROUND

LIGHT

TERMINAL

(#0)

BRACKET CAN
MOUNT IN THREE
PLACES

LOCATION 1

LOCATION 2

LOCATION 3

CORNER HOLE IS
SHARED FOR
LOCATIONS 2 & 3

MDR2

MDR
MDRNR

MDRM

MDRM2

TWO

CHANNEL

SINGLE

CHANNEL

CHANNEL TWO 
PROGRAMMING
BUTTON (ONLY
ON MDR2)

CHANNEL ONE 
PROGRAMMING
BUTTON

PROGRAMMING
LED

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