Linear manual

MegaCode Series

DESCRIPTION

MDR, MDR2, MDRNR,

The MegaCode series of digital receivers are wireless radio

controls designed for use with automatic garage door and gate

MDRM, MDRM2

openers. The MegaCode radio format provides unparalleled

security. The transmitter and receiver can be programmed to more

DIGITAL RECEIVERS

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

Installation Instructions

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

MegaCode 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

(800) 421-1587 ∙ www.linearcorp.com

connections to activate the operator’s light or control other devices.

STEP 1A

MDR/MDRNR/MDR2 Three-terminal Operator

STEP 1B

MDRM/MDRM2 Recessed Receiver Operator

Installation. Hold receiver up to back of operator. Connect

Installation. Loosen operator terminal screws. Install receiver

Terminals 1, 2 & 3 on the receiver to Terminals 1, 2 & 3 on the

into operator “pocket”. Connect Terminals 1, 2 & 3 on the receiver

operator.

to Terminals 1, 2 & 3 on the operator.

1

2

3

COMMON

RELAY

24-VOLTS

RADIO

GROUND

POWER

1

2

3

3

2

1

1 2 3

COMMON

24-VOLTS

RELAY

RADIO

GROUND

POWER

3

2

1

CONNECT

BRASS

RECEIVER

MATCH UP

TERMINALS

DIRECTLY

RECEIVER FITS INTO

FIT TO

TERMINAL

TO OPERATOR

TERMINALS

NUMBERS

BACK OF OPERATOR

ANTENNA

1, 2 AND 3

STEP 2 MDR2/MDRM2 Two-channel Receiver Installation.

STEP 3

Optional Receiver Mounting Bracket. If the receiver

Connect the receiver to the operator as described in the previous

isn’t going to be mounted directly to the operator terminals, an

step. The channel-two pigtail wires can be connected to the

optional mounting bracket is supplied. It can be installed three

operator’s light toggle terminals or to an external device.

ways onto the MDR or MDR2 case. Screw the bracket to a wall

BROWN

ORANGE

RED

CONNECT BROWN TO COMMON GROUND

or stud and snap the receiver onto it.

RELAY

RELAY

RELAY

CONNECT ORANGE TO LIGHT TERMINAL

NORMALLY

NORMALLY

BRACKET CAN

CORNER HOLE IS

COMMON

OPEN

CLOSED

GROUND (#1)

MOUNT IN THREE

SHARED FOR

PLACES

LOCATIONS 2 & 3

LOCATION 2

LIGHT

LOCATION 1

TERMINAL

(#0)

3-TERMINAL

RECESSED RECEIVER

LOCATION 3

OPERATOR

OPERATOR

MDR - Single-channel external receiver with relay output. MDRM - Single-channel internal receiver (fits operators with recessed receivers) with solid state output.

MDRNR - Single-channel external receiver with solid state output. MDR2 - Two-channel external receiver with relay outputs. MDRM2 - Two-channel internal receiver (fits operators with recessed receivers) with solid state output on channel one and relay output on channel two.

SINGLE	MDRM2
CHANNEL
	MDRM
MDR	MDR2
	TWO
MDRNR
	CHANNEL

STEP 1C MDR/MDR2 Two-terminal Operator Installation.

The 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).

WIRE TERMINALS 1 & 2 TO OPERATOR	WIRE TRANSFORMER TO TERMINALS 1 & 3
PUSHBUTON TERMINALS
	1
	2
	3

INSTALL 3 SCREWS

USE MODEL #TF524 24VAC, .5VA

TRANSFORMER

STEP 4A MDR/MDRNR/MDR2 Program button and LED Location. Locate the program button and LED on the side of the receiver case.

CHANNEL ONE

PROGRAMMING

BUTTON

PROGRAMMING

LED

CHANNEL TWO

PROGRAMMING

BUTTON (ONLY

ON MDR2)