10 Wiring the system
This chapter covers:
10.1 Wiring the X-BUS interface
10.2 Wiring of branch expander
10.6 Wiring an external SAB bell
10.7 Wiring an internal sounder
10.9 Installing plug-in modules
10.1 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
on the next page) and spur (see
page 77) 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
page 78) 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
on the next page) or spur
(see
on page 77) 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 2018
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A6V10276959-d
11.2018