
NOTICE: 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 (for example, 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 (for example,
Belden 9829). If shielding is required (that is, 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.
NOTICE: For star and multi-drop wiring
It is 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
(that is, sites with high electric field interference) a new wiring in proper spur or loop configuration
with appropriate installation cable configuration has to be done.
10.1.5 Cable Map
Identification and numbering order for expanders and keypads differ depending on automatic or manual
addressing of the expanders. For information on manual and automatic configuration, see
For a system with manual addressing, expanders and keypads have a separate numbering sequence
and are defined by the engineer manually. That is, expanders are numbered 01, 02, 03, etc. as desired.
Using same numbers, keypads may be numbered as desired.
In the manual configuration, the system automatically allocates zones to each expander. For this
reason, devices with no zones, such as 8 output expanders should be addressed last.
For a system with automatic addressing, expanders and keypads belong to the same numbering group
and are assigned by the controller. That is, expanders and keypads are together numbered 01, 02, 03,
in the order that they are detected relative to the location of the controller.
10.2 Wiring of branch expander
The wiring of the X-BUS interface with 8 terminals 1A/1B to 4A/4B provides for the connection of an
additional branch expander.
If the branch is not used then the terminals 1A/1B are used to connect to the next expander/keypad.
Terminals 3A/3B and 4A/4B are then not used.
The following modules have branch expander wiring capability (additional terminals 3A/B and 4A/B):
l
8 Input/2 Output Expander
l
8 Output Expander
l
PSU Expander
l
Wireless Expander
l
2-door Expander
SPC4xxx/5xxx/6xxx – Installation & Configuration Manual
Wiring the system
© Vanderbilt 2018
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A6V10276959-d
11.2018