9 Wiring the system
This chapter covers:
9.1 Wiring the X-BUS interface 35
9.2 Wiring of branch expander 43
9.3 Wiring the system ground 44
9.4 Wiring the relay output 44
9.5 Wiring the zone inputs 45
9.6 Wiring an external SAB bell 48
9.7 Wiring an internal sounder 48
9.8 Wiring Glassbreak 49
9.9 Installing plug-in modules 49
9.1 Wiring the X-BUS interface
The X-BUS interface provides for the connection of expanders to the controller. The X-BUS can be wired
in a number of different configurations depending on the installation requirements. The X-BUS interface
baud rate is 307kb.
NOTICE: The X-BUS is an RS-485 bus with a baud rate of 307kb. The full performance is only
supported in loop (see Loop configuration on the next page) and spur (see Spur configuration on
page37) wiring configuration (best signal quality due to daisy chain of isolated sections with 1
transmitter/1 receiver and balanced terminating resistors on each end).
The performance in star or multi-drop configuration wiring (see Star and multi-drop configuration on
page38) is limited due to non-optimal conditions of the RS-485 bus specification (reduced signal
quality due to multiple receivers/transmitters in parallel with unbalanced terminating resistors).
NOTICE: It is strongly recommended to use loop (see Loop configuration on the next page) or spur
(see Spur configuration on page37) configuration.
The table below shows the maximum distances between controller/expander or expander/expander for
all cable types in loop and spur configuration.
Cable Type Distance
CQR standard alarm cable 200 m
UTP Category: 5 (solid core) 400 m
Belden 9829 400 m
IYSTY 2 x 2 x 0.6 (min) 400 m
Each device has 4 terminals (1A, 1B, 2A, 2B) for connection to expanders via the X-BUS cable. The
controller initiates a detection procedure on power up to determine the number of expanders connected
on the system and the topology in which they are connected.
© Vanderbilt 2023 35 I-200572
08.12.2023
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