Model GCU
Gate Control Unit
Overview
Step 3
The Gate Control Unit (GCU) can be paired with the
Gate Access Panel (GAPLM) to wirelessly control a
gate operator.
The GCU is compatible with various Liftmaster
Wireless Products.
NOTE: This step applies only if more than one GCU
is being used.
Up to four GCUs can be used. Each GCU will need a
different Identity. Set the Identity of the GCU by
changing the Dipswitches as shown in the chart
below.
GCU ID
Switch #1
OFF
Switch #2
OFF
1
2
3
4
Carton Inventory
ON
OFF
ON
OFF
ON
ON
Dipswitches
LED
Gate Control Unit (GCU)
Learn
Button
Assembly
Step 1
Programming to GAPLM
Step 4
Remove cover.
Press the Learn button on the
GCU for one second. The LED
will light for 20 seconds.
Within 20 seconds enter Master PIN Number on
GAPLM:
Step 2
Install 4 AA Alkaline batteries
(not provided). (Lithium
batteries recommended for
colder environments.)
Followed by GCU Identity as determined in Step 3:
OR
OR
OR
3
4
1
2
“BEEP”“BEEP”
The GCU LED will blink 3 times indicating
programming is successful. If error tone is heard or
GCU LED emits 3 double blinks, then programming
has failed.
Repeat for additional GCUs.
1
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Gate Operator “ON”Time
Troubleshooting
There is an error tone when the GCU is activated.
The GAPLM or DAILM is not communicating with the
GCU. The GCU may be out of range. If the units work
properly when close together, the GCU may need to
be mounted higher off the ground or on a different
surface. Metal, trees, or masonry cause the most
interference.
Dipswitches
LED
Learn
Button
If the units do not work when close together, the
GAPLM or DAILM has not been programmed to the
GCU. Double-check the GCU’s Identity (1-4) and
reprogram it.
For most connections the default setting of 1/2
second is best. However, for connection to yard lights,
cameras, etc. the device can be adjusted as to how
long it stays on.
Memory needs to be cleared.
Hold down the Learn button until the LED blinks a
total of 8 times.
“ON”Time
1/2 second
1/2 second
10 seconds
30 seconds
Switch #3
OFF
Switch #4
OFF
ON
OFF
ON
OFF
ON
ON
NOTE: For most gate system wiring, dipswitch #4
should be left “OFF”.
Open Gate Configuration
Use this configuration when using the Gate System
as an open-only system, which automatically closes,
based on timer or a magnetic loop.
Enable the Auto-close feature on Gate Operator.
Connect the GCU as shown in Wiring to Operator
section. Refer to product-specific manual for wiring
information. On the Intercom, disable Gate Status
checking.
3
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FOR TECHNICAL SUPPORT DIAL OUR TOLL FREE NUMBER:
1-800-528-2806
NOTICE: To comply with FCC and or Industry Canada rules (IC), adjustment or modifications of this receiver and/or transmitter are prohibited,
except for changing the code setting or replacing the battery. THERE ARE NO OTHER USER SERVICEABLE PARTS.
Tested to Comply with FCC Standards FOR HOME OR OFFICE USE. Operation is subject to the following two conditions: (1) this device may not
cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
© 2007, The Chamberlain Group Inc.
All Rights Reserved
114A3523
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