Linear Radio MDR User Manual

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.  
DESCRIPTION  
MegaCode Series  
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  
MegaCode receiver can remember a maximum of 10  
transmitters.  
MDR, MDR2, MDRNR,  
MDRM, MDRM2  
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.  
DIGITAL RECEIVERS  
Installation Instructions  
MDRM2  
SINGLE  
CHANNEL  
MDRM  
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.  
MDR2  
MDR  
MDRNR  
TWO  
CHANNEL  
(800) 421-1587 www.linearcorp.com  
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 Recessed Receiver 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.  
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).  
1
2
3
24-VOLTS  
COMMON  
GROUND  
RELAY  
RADIO  
POWER  
WIRE TERMINALS 1 & 2 TO OPERATOR  
PUSHBUTON TERMINALS  
WIRE TRANSFORMER TO TERMINALS 1 & 3  
3
1
2
3
2
1
1
1
2
3
2
24-VOLTS  
RADIO  
POWER  
3
COMMON  
GROUND  
RELAY  
INSTALL 3 SCREWS  
3
2
1
CONNECT  
RECEIVER  
DIRECTLY  
BRASS  
TERMINALS  
FIT TO  
TERMINALS  
1, 2 AND 3  
MATCH UP  
TERMINAL  
NUMBERS  
USE MODEL  
#TF524 24VAC, .5VA  
TRANSFORMER  
RECEIVER FITS INTO  
BACK OF OPERATOR  
TO OPERATOR  
ANTENNA  
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.  
BROWN ORANGE  
RELAY  
RED  
CONNECT BROWN TO COMMON GROUND  
CONNECT ORANGE TO LIGHT TERMINAL  
CHANNEL ONE  
PROGRAMMING  
BUTTON  
RELAY  
NORMALLY  
CLOSED  
RELAY  
NORMALLY  
CORNER HOLE IS  
BRACKET CAN  
COMMON  
OPEN  
SHARED FOR  
LOCATIONS 2 & 3  
MOUNT IN THREE  
PLACES  
GROUND (#1)  
PROGRAMMING  
LED  
LOCATION 2  
LOCATION 1  
LIGHT  
TERMINAL  
(#0)  
CHANNEL TWO  
PROGRAMMING  
BUTTON (ONLY  
ON MDR2)  
3-TERMINAL  
OPERATOR  
OPERATOR  
LOCATION 3  
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