Chamberlain MADCBB - Manual (Page 11)

11
WIRING »
PRIMARY/SECOND WIRING
PRIMARY/SECOND WIRING
In a primary/second configuration, either operator can be the primary.
Choose an operator to be the primary and then direct all control wiring to it
(also install vehicle detectors and receivers in it).
At the primary, any input (at J5) with control wires (detectors, receivers,
keypads, timers, etc.) to it must also be run to the same terminals of the
second. Along with these control wires, both operators MUST share a common
ground connection from chassis to chassis (or from common to common, i.e.,
primary gate J5 terminal #12 to second gate J5 terminal #12).
EXAMPLE: If only open and close are used at primary then three wires will
run between gates (Figure 1).
If it is required that if one gate senses an obstruction, the other reverses also,
then 3 additional wires must be run between the primary J3 and second J3
(Figure 2). These connections are for transmitting IRD (obstruction signals)
between both operators. This will allow the primary or second to inform the
other that a closing obstruction has occurred and for it to reverse and open.
SET switches on S2, 1-8 the same on both gates. 1
2
3
1 2 3 4 5 6 7 8 9 10 11 12
1 2 3 4 5 6 7 8 9 10 11 12
RX GND TX
RX GND TX
1 2 3 4
1 2 3 4
Common
Primary J5
Second J5
Primary J3
Second J3
Close
Open
IRD - Obstruction Signal Connections
Terminal 1 of Primary must go to terminal 4
of Second and terminal 1 of Second must go
to terminal 4 of Primary. Terminal 2 of
Primary must go to terminal 2 of Second.
FIGURE 1
FIGURE 2