MegaCode Series
1
2
3
1
2
3
CONNECT
RECEIVER
DIRECTLY
TO OPERATOR
MATCH UP
TERMINAL
NUMBERS
123
COMMON
GROUND
RELAY
24-VOLTS
RADIO
POWER
MDRG
DIGITAL GATE RECEIVER
Installation Instructions
(800) 421-1587 • www.linearcorp.com
DESCRIPTION
The MegaCode series of digital receivers are wireless radio controls
designed for use with automatic 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.
of 40 transmitters.
Receivers are normally powered with 24 volts AC/DC from the gate
operator. The MDRG has a built-in type “F” connector and is supplied
with a 9 inch local antenna. The Linear EXA-GP Remote Antenna may
be used to enhance the operational range of the MDRG.
Each MegaCode receiver can remember a maximum
STEP 1A
MDRG Three-terminal Operator Installation.
Hold
receiver up to back of operator. (Refer to gate op erator manual
as the operator cover may need to be removed first.) Connect
Terminals 1, 2 & 3 on the re ceiver to Terminals 1, 2 & 3 on the
operator. Operator power supply output must be 24V.
STEP 1B
MDRG Installation (For non 24V Operator).
Model TF524 step-down transformer must be u sed to power the
receiver when connecting to an operator supplying anything other
than 24V. Install the screws supplied into th e brass termin als on
the receiver. Connect the transformer wires to Terminals 1 & 3
(polarity not important). Connect receiver Terminals 1 & 2 to the
two operator activation terminals (polarity not importa nt).
WIRE TERMINALS 1 & 2 TO OPERATOR
PUSHBUTON TERMINALS
STEP 4
MDRG Program button and LED Location.
the program button and LED on the side of the receiver case.
WIRE TRANSFORMER TO TERMINALS 1 & 3
1
2
3
INSTALL 3 SCREWS
USE MODEL
#TF524 24VAC, .5VA
TRANSFORMER
PROGRAMMING
BUTTON
PROGRAMMING
LED
A
Locate
STEP 2
Optional Receiver Mounting Bracket.
If the receiver
isn’t going to be mounted directly to the ope rator terminals, an
optional mounting bracket is supplied . It can be installed three
ways onto the MDRG case. Screw the bracket to a wall or st ud
and snap the receiver onto it.
BRACKET CAN
MOUNT IN THRE E
PLACES
LOCATIO N 1
STEP 5
Program receiver.
1
2
3
Momentarily press the receiver’s
CORNER HOLE IS
SHARED FOR
LOCATIONS 2 & 3
LOCATIO N 2
LOCATIO N 3
program button. The red programming LED will light if there’s
room in the receiver’s memory for another transmitter (40
maximum per receiver). 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 transmitt er.
NOTE: Be sure to press the receiver program button for less
➥
than 2 seconds.
WARNING! Operator will not activate when the rec eiver is
➥
being programmed from the transmitter, but the gate
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 an y transmitter
tuned to the receiver’s frequency (programmed into the
receiver or not) is activated.
STEP 3
Installing the antenna.
screwing it onto the “F” connector.
USE RECEIVER ANTENNA WIRE
OR OTHER POINTED OBJECT
TO PRESS AND RELEASE PROGRAM
BUTTON FOR CHANNEL 1
PROGRAMMING
BUTTON
LED WILL LIGHT
WHEN RECEIVER
IS READY
Attach the local antenna by
WHEN RECEIVER
IS READY, PRESS THE DESIRED
TRANSMITTER BUTTON
RECEIVER LED
WILL FLICKER
AS TRANSMITTER
IS ENTERED INTO
MEMORY
STEP 6
Add additional transmitters.
Repeat Step 5 for each
transmitter used with this receiver. Be sure to press the receiver’s
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 bu tton
is pressed, the receiver’s memory is full (40 transmitters total).
Use the erase function (Info 1) to remove transmitters from the
receiver’s memory.
1
H
C
THEN PRESS TRANSMITTER BUTT ON
STEP 7
Review memory.
Press and hold the receiver’s
program button until t he LED begins to flash (about 3 seconds)
and then release the button. Count the number of flashes. The
number of flashes equals the number of transmitters programmed
into the receiver.
NOTE: Don’t hold down the programming button longer
➥
than 5 seconds, the receiver’s memory for that channel will
be erased (Info 1).
1
H
C
STEP 8
Test receiver.
Be sure gate area is clear.
Activate
each transmitter. The receiver relay should click and the operator
should activate.
Wait 1 second between each activation.
WITH MULTI-BUTTON
TRANSMITTERS PRESS
PRESS PROGRAM BUTTON FIRST
INFO 1
Erasing receiver memory.
THE DESIRED BUTTON
Transmitters may be
erased from the receiver’s memory by pressing and holding the
receiver’s program button for 5 seco nds or more. After the LED
blinks (count of transmitters) it will blink one more time as the
receiver’s memory is erased.
All transmitters are erase d at the
same time.
CH1
PRESS PROGRAM BUTTON
FOR FIVE SECONDS OR MORE
LED WILL FLASH, COUNTING THE
TOTAL NUMBER OF TRANSMITTERS
PROGRAMED. THEN IT WILL BLINK
ONE MORE TIME AS THE TRANSMITTERS
ARE ERASED.
LIMITED WARRANTY
This product is warranted to the consumer against defects in
material and workmanship for one year from the date of purchase.
This warranty applies to first retail buyers of new devices.
Warrantor will repair, or at its option, re place, a ny de vice it find s
that requires service under this warranty, and will return the
repaired or replaced device to the consumer at the warrantor’s
cost. For warranty service and shipping instructions contact
warrantor at the address shown below. Devices must be sent to
warrantor for service at owner’s expense. The re medies prov ided
by this warranty are exclusive. Implied warranties under state law
are to the one year period of this written warranty. Some states
do not allow limitations on how long an implied warranty lasts, so
the above limitation ma y not apply t o you. In or der to be protected
by this warranty, save your p roof of purc hase and s end c opy wi th
equipment should repair be required. This warranty gives you
specific legal rights, and you may also have ot her rights which
vary from state to state.
PRESS PROGRAM BUTTON
FOR THREE SECONDS
THEN RELEASE
INFO 2
Mounting the Remote Antenna.
LED WILL FLASH, COUNTING THE
TOTAL NUMBER OF TRANSMITTERS
PROGRAMED
Attach antenna to
post as shown or refer to antenna instructions for other options.
2" MAXIMUM
DIAMETER
U-BOLT
All products returned for warranty service require a Return
Product Authorization Number (RPA#). Con tact Linear
Technical Services at 1-800-421-1587 for an RPA# and other
important details.
PRESS TRANSMITTER
WARNING!
BE SURE GATE
AREA IS CLEAR
OF OBSTRUCTIONS
➥
NOTE: If the receivers LED flashes continuously when a
BUTTON TO TEST
transmitter isn’t being activated, the receiver is too close to an
electrical noise source. Move the receiver away from the noise
source or call technical services for assista nce.
IMPORTANT !!!
Linear radio controls provide a relia ble commu nications link a nd
fill an important need in portable wireless signaling. 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 © 1999 Linear Corporation 210211 B