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Rev E Doc 01-20201 8 of 33
4. TANDEM GATE DETAILS
The Tandem gate is typically used in high traffic situations where some control of incoming and/or
outgoing traffic is required. The outside gate (slave) is usually a less expensive fast moving
barrier gate (or light slide gate) which protects the more expensive and less mobile Slide or Swing
inside gate (master). The outside gate does this by stopping the vehicle until the inside gate is
completely open. The Tandem configuration can consist of any LiftMaster model for Master, and
a model SL 1000-B3 (slide gate), or BG 3000-B3 (barrier gate) for Slave. NOTE: The SW 2000-
B3 (swing gate) may not be used for Slave.
Figure 5. Typical Tandem Gate Installation.
STREET
COMPLEX
Gate
Operator
Master
Gate
Operator
Slave
Exit Loop
Inside Interrupt
Loop
Shadow Loop
(swing gate only)
Outside Interrupt
Loop
Inside Interrupt
Loop
Outside Interrupt
Loop
ADDTIONAL
INPUTS:
Radio
Cycle
Interrupt Bar
Photo-Sensors
Fire
MagLock
Manual Inputs
ADDITIONAL
INPUTS:
Radio
Cycle
Interrupt Bar
Photo-Sensors
Fire
MagLock
Manual Inputs
1384F5
Master/
Slave
Cable