Specifications

Mobility and Logistics, Traffic Solutions

Sopers Lane, Poole, Dorset, BH17 7ER

Security classification Unrestricted Page 63 of 83

Version 2 Status Released

Last Editor Harry Smyth Date 09/12/2014

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

4.9 SLD4 Detector Cards

SLD4 Detector Cards do not form part of the Outer case, chosen from Table 4 and therefore

must be ordered separately. As detailed previous sections, detector cards are inserted into

Intelligent Detector Backplanes. Each Intelligent Detector Backplane will accommodate four

SDL4 Detector Cards. The SDL4 Detector Cards have a facility to communicate with each

other to allow automatic setup. This communication facility uses an infrared link. 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 out, must be

connected using linking cables. Please refer to Figure 47 which shows the required

connection.

Figure 50 – IDB Optimisation

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.