Mobility, Intelligent Traffic Systems
Sopers Lane, Poole, Dorset, BH17 7ER
Functions:
Modem 5V Supply (1,2 & 3,4) – This output provides a regulated 5V supply with
active current limiting set at approximately 700mA. This supply output is NOT
battery backed.
Isolated Shutdown Output (5,6) – These two pins provide an opto-isolated controller
shutdown signal. The + signal is the collector and the – signal is the emitter of the
opto transistor. The output is active low (ie low impedance) when the controller is in
the shutdown state. The maximum current that this output can pass is 25mA and
suitable external devices must be employed to ensure that this figure is not
exceeded otherwise damage to the ST950 board will occur.
Digital External Supply Monitor (7,8) – For future use.
Analog External Supply Monitor (9,10) – For future use.
Bottom connector – Serial port for future use.
The double stacked connectors are numbered as shown in Figure 2 below:
Figure 2 – Double stacked connector pin numbering
4.5.3 Links, Switches and Fuses
Before the controller is switched on, the switches and links on the CPU Card must
be checked to ensure they are set correctly. Also the firmware should be checked to
ensure that the correct version (as specified on the IC4 printout) is loaded.
The switch and link settings are mainly related to the hardware fail flash facility;
their locations and option selections are shown in Figure 19.
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