Chamberlain Switch GCU User Manual

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
“BEEPBEEP”  
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
 
Gate Operator “ONTime  
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.  
“ONTime  
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
 
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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