Section 3 – System Wiring and Hookup
3–5
Multiplex Zone Expander
The 7120 or 7126 Multiplex expander module provides multiplex loop expansion to the
control panel. Each multiplex loop consists of a two-wire hookup that transmits power and
data from the control panel to the multiplex accessories. The multiplex expander can be
installed as follows:
1- Remove all power from the control panel.
2- Attach the three plastic support mounting pieces to the multiplex expander module in the
three holes located on the printed circuit board of the multiplex expander. Place the pointed
end through the bottom of the multiplex expander.
3- Attach the multiplex expander to the control panel through the plug in connections located
to the left of the wiring diagram. Carefully align the six pins on the top and bottom of the
mounting connectors. Press down firmly on the expander board to insure that the board is
secure in both connectors.
In order for the control panel recognize the multiplex expander the programming option enabling
multiplex operation must be turned on. This can be performed through the keypad programming
sequence or through the EZ-Mate PC Downloading software. Consult the appropriate manuals to
determine the method to enable the multiplex capability.
The multiplex bus can be connected as follows:
MULTIPLEX BUS LOOP
NUMBER/POLARITY
7120 MULTIPLEX
ZONE EXPANDER
7126 MULTIPLEX
ZONE EXPANDER
1
-
LP1 -
LP1 -
1
+
LP1 +
LP1 +
2
-
N/A
LP2 -
2
+
N/A
LP2 +
Proper polarity of the multiplex bus must be maintained.
-
LP1
+
-
LP2
+
7120
XL-4
XL-4B
XL-5
7126
-
LP1
+
7120 SINGLE BUS
7126 DUAL BUS
EXPANDER FOR XL-4 AND XL-4B
EXPANDER FOR XL-5
