UTMC OTU/MOVA Handbook
667/HB/31601/000
Page 72
Issue 5
6.11.2 Uni-Direction Loops
Number of Associated UD Loops
Enter the number of Uni-direction units required on the outstation and then press
‘Submit’. The UD units are numbered automatically from 1 upward.
UD Facility
Each UD unit comprises an A-loop and a U-loop. The A-loop is the main loop
and is installed so that traffic travelling in the normal forward direction will
activate the A-loop first. The U-loop is installed so that traffic travelling in the
reverse direction will activate the U-loop first.
The output of the UD unit is activated only if the vehicle is travelling in the normal
forward direction.
Where it is required to monitor the reverse direction as well, then an additional
UD unit can be configured with A and U loop inputs swapped over.
The output of the UD unit can be mapped to SCOOT, vehicle counting, vehicle
queue and vehicle occupancy functions by selecting the UDn entry in the
Card/Port field.