Wiring the X-BUS interface
Installation & Configuration Manual
10 Wiring the system
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 307 kb.
The X-BUS is an RS-485 bus with a baud rate of 307 kb. The full performance is
only supported in loop [âž™ 73] and spur [âž™ 74] 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 [âž™ 75] or multi-drop [âž™ 75] configuration wiring 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).
It’s strongly recommended to use loop [➙ 73] or spur [➙ 74] configuration.
The table below shows the maximum distances between controller / expander or
expander / expander for all cable types in loop and spur configuration.
UTP Category: 5 (solid core)
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.
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