Specifications

Mobility and Logistics, Traffic Solutions

Sopers Lane, Poole, Dorset, BH17 7ER

Security classification Unrestricted Page 27 of 83

Version 2 Status Released

Last Editor Harry Smyth Date 09/12/2014

Document Name Configuration Control Document No. 667/CC/45950/000

3.9 SLD4 Detector Cards

As detailed in previous section SLD4 detector cards are inserted into Intelligent Detector

Backplanes. Each Intelligent Detector Backplane will accommodate four SDL4 Detector

Cards. The SDL4 Detector Cards have an infrared facility to communicate with each other;

this allows automatic setup. The infrared beam travels horizontally between SLD4 cards and

therefore only those SLD4 cards that are mounted alongside each other can utilise this

infrared communications technique. Communications between SLD4 Cards mounted

vertically, with respect each other must be connected using a link cable. Please refer to the

parts listing. Please also refer to Figure 9 which shows the required connection.

Figure 12 – Ordering Sequence for Detector Back Planes and Detector Cards

Important Note

Configuration Engineers should read the notes in the WiMag section regarding

Backplane positioning. Important information on the relationship between SDL4

Cards, the Infrared communication technique between SLD4 cards and the

restrictions this communication technique has on the positioning of Detector Cards is

contained in the that section.