ST950S Plus+ Installation and Commissioning Manual
The Intelligent Detector Backplane itself connects to the CPU Card, or previous
Intelligent Detector
Backplane, via the GSPI interface serial cable through which the card also obtains its power supply.
The Loop Detector supply is cabled separately as shown in
derived from the system 24VDC PSU. An appropriate wiring kit is required.
If required, a twisted ribbon cable provides the connection between the loop detector cards and the
road loops, via the loop termination card. The SLD4 /950 variant also includes additional connectors
to allow the SLD4 loop detector auto-configuration communications link to be wired between multiple
backplanes within a controller.
Figure 27. Inteligent Backplane (rear view)
3.14.1. Intelligent Detector Backplane Card LEDs
The Intelligent Detector Backplane Card has three tri-colour status LEDs which are identical to the
LEDs on the I/O card as described in section
that these LEDs are viewed from above and are seen in reverse order (i.e. LP3, LP2 and LP1 from left
to right). For this reason, the table below shows
the LEDs in the order they are seen.
In terms of a linked communications chain
Conditions other than those identified above should not occur and can be treated as faults.
Page 63
