Wiring the X-BUS interface
Installation & Configuration Manual
Not allowed wiring with a second star point
If the mix of star and multi-drop configuration is not properly wired the reduced
signal quality may lead to slow reaction time of connected devices (e.g. keypad
operation) or even loss of communication to devices. If such behavior is observed
a wiring in loop OR star configuration is strongly recommended.
10.1.4 Shielding
The shielding terminals (SHLD) should only be used for cables types with
shielding (e.g. Belden 9829). If shielding is required (i.e. sites with high electric
field interference): connect the cable shield to the SHLD terminals on the
controller and all networked expanders. If the shield needs to be connected to
earth then a cable needs to be connected from the SHLD terminal on the
controller to the chassis earth stud. Do NOT earth the SHLD terminal on any of
the expanders.
For star and multi-drop wiring
It’s not recommended to use shielded cables due to disadvantageous electrical
characteristics (higher capacitance) in star and multi-drop wiring configuration.
However, if shielding is required (i.e. sites with high electric field interference) a
new wiring in proper spur or loop configuration with appropriate installation cable
configuration has to be done.
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