Vanderbilt SPC4 Series, Руководство по установке и настройке, Страница: 77 / 402

The loop (or ring) cabling method offers the highest security by providing fault tolerant communications
on the X-BUS. All keypads and expanders are supervised and in case of a X-BUS fault or break, the
system continues to operate and all detectors are monitored. This is achieved by connecting 1A, 1B on
the controller to 2A, 2B on the first keypad or expander. The wiring continues with connection 1A, 1B to
2A, 2B on the next expander etc. to the last keypad or expander. The last connection is 1A, 1B of the
last expander to 2A, 2B of the controller. See wiring configuration in the figure below.
Number Description
1 Controller
2-4 Expanders
10.1.2 Spur configuration
NOTICE: SPC52xx/53xx/63xx supports 2 spurs (2 X-BUS ports).
SPC42xx/43xx supports 1 spur (1 X-BUS port).
NOTICE: All expanders/keypads are fitted with a termination jumper by default. In spur
configuration it is imperative to have these jumpers fitted.
The spur (or open loop) cabling method offers a high level of fault tolerance and may be more
convenient on certain installations. In the case of a X-BUS fault or break, all expanders and detectors
up to the fault continue to be supervised.
In this configuration, the SPC controller uses a single the X-BUS port (1A/1B or 2A/2B) to support a
group of expanders. See wiring configuration in the figure below. The last expander in an open loop
configuration is not wired back to the controller and can be identified by the fast LED flashing light (one
flash every 0.2 seconds approx) when in Full Engineer programming.
In automatic mode, the expander numbering commences at the expander nearest to the controller and
ends with the expander connected farthest from the controller. For example, if 6 expanders are
connected in an open loop configuration, then the nearest expander on the X-BUS connection is
expander 1, the second nearest expander is 2, etc., ending with the expander wired farthest from the
controller, which is expander 6.
SPC4xxx/5xxx/6xxx – Installation & Configuration Manual Wiring the system
© Vanderbilt 2018 77 A6V10276959-d
11.2018