ProSYS Installation and Programming Manual 19
The second set of four terminals on the left of the Main Panel represent the Expansion
BUS. These support the connection of keypads and expansion modules.
The connections are terminal-to-terminal with color-coded wires, as follows:
BUS
Terminal
Description
AUX RED
+12V power for BUS expansion modules
COM BLK
Black 0V common for BUS expansion modules
BUS YEL
Yellow DATA connection for BUS expansion modules
BUS GRN
Green DATA connection for BUS expansion modules
To prevent a possible drop in voltage due to multiple keypads and long wire runs, use
a quality 4-conductor cable with an appropriate gauge size (refer to the table of gauge
sizes in Chapter 1, Introducing ProSYS).
The parallel wiring system supports parallel connections from any point along the
wiring (refer to
Figure 5 below). The maximum wire run permitted is 300 meters (1000
feet) for all legs of the BUS.
Figure 5: 4-Wire Expansion BUS
NOTE:
The ProSYS has 2 separate BUS connections. If one BUS is shorted or there is any kind of
problem that interrupts the BUS data, the other BUS will continue to operate normally.
Wiring the Zones to Sensors and Detectors
(Zone Terminals Z1 through Z8)
 To wire the zones to sensors and detectors:
1 Connect up to 8 hardwired zones, using twisted-pair or 4-conductor cable wiring.
2 Connect each zone to the appropriate Zone (Z) terminal and its related COM terminal.
Each pair of zones shares a COM terminal. For example, Z1 and Z2 share a COM
terminal, as do Z3 and Z4, and so on.
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