Siemens SPCK421 Spezifikationen Seite 40

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9
Wiring the system
Wiring the X-BUS interface
40
Siemens AB
A6V10276959
Security Products
18.11.2011
9 Wiring the system
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 307 k b .
NOTICE
The X-BUS is an RS-485 bus with a baud rate of 307 kb. The full performance is
only supported in loop [41] and s p u r [42] 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 [43] or multi-drop [ 43] 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).
NOTICE
It’s strongly recommended to use loop [ 41] or spur [ 42] 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.
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