Mobility, Intelligent Traffic Systems
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4.9.1 I/O Card Status LEDs
The I/O card has three tri-colour status LEDs as shown in
Figure 21, which are used to indicate various conditions, as follows:
Green Toggle on
Receipt of Message*
(As above depending
on state)
* - May flash so fast that it looks like Green Steady.
Table 6 – I/O Card LEDs
Conditions other than those identified above should not occur and can be treated as
faults.
4.9.2 I/O Card Rotary Address Switch
This screwdriver-adjustable switch is located on the I/O card(s) as shown in
Figure 21 and is set up for the card address (before the controller is powered up) in
accordance with the appropriate Works Specification. The valid address range is 1
through 15 (where A to F denote 10 to 15 respectively). Address 0 is the default
address switch position for spare cards.
The address range is shared with the Intelligent Detector Backplane
cards and must be unique.
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