Wiring the System
24
Siemens Building Technologies
Fire Safety & Security Products
09.2008
7 Wiring
the
System
7.1
Wiring the X-BUS Interface
The X-BUS interface provides for the connection of Expanders to the SPC
Controller. The X-BUS can be wired in a number of different confirmations
depending on the installation requirements. The X-BUS interface baud rate is
307kb. Tab. 1 shows the maximum distances between Controller / Expander or
Expander / Expander for all cable types.
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
Tab. 1
Cable Type and Distance
Each device has 2 terminals, 1A and 1B, for connection to Expanders via the X-
BUS cable. The SPC 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.
The following modules have Branch Expander wiring capability: 8 Input / 2 Output
Expander, 8 Output Expander. See Section 7.2 Wiring of Branch Expander for
instructions on branch expander wiring.
1
From Previous Expander
2
To Next Expander
3
SPC Controller
Fig. 4
Wiring of Expanders
