4–1
S E C T I O N 4
Multiplex Polling Loop
• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •
In This Section
♦
Multiplex Expander Installation
♦
Polling Loop Overview
• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •
Expansion of the system can be accomplished through addition of the 7120 (XL-4) or 7126
(XL-5) Multiplex Loop Expander module to the expansion slot of the control panel. The 7120
board provides an additional 64 zones through a two-wire multiplex polling loop. The 7126
board provides an additional 120 zones through a two-wire multiplex polling loop. Each of
the points connected to the bus will be known as separate system zones as follows:
Zones 1-8
Hardwired zones located on circuit board
Zones 9 – 72 (XL-4)
Multiplex zones through the 7120 module [multiplex bus]
Zones 9 – 128 (XL-5)
Multiplex zones through the 7126 module [multiplex bus]
The multiplex loop can accommodate 64 (7120)
or 120 (7126) points, with any combination of
point types.
Multiplex Expander Installation
The 7120 or 7126 Multiplex expander module provides a two wire multiplex bus to the
control panel. The 7120 or 7126 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 heat sink. 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.
Note: 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.
-
LP1
+
-
LP2
+
7120
XL-4
XL-4B
XL-5
7126
-
LP1
+
7120 SINGLE BUS
EXPANDER FOR
XL-4 AND XL-4B
7126 DUAL BUS
EXPANDER FOR
XL-5
