302UM0017 Rev 01
PD230 Enhanced Detector User Manual
Page 17 of 37
In the pulse mode the detector will give a pulse of 150 millisecond duration,
when a vehicle enters the loop (Pulse on Detect) (a pulse of 250 millisecond is available on
request. MOQ applies).
(Pulse on un-detect is available on request. MOQ applies)
4.3.3 AB Logic Presence Mode (Barrier Operation)
Internal link LK1 shorted from Pin 1 to Pin 2. In this mode switches 9 & 10 are ignored.
AB LOGIC Presence Mode is a direction logic mode, and is capable of determining direction
of travel of a vehicle. Two loops are laid in the direction of travel to provide the input for this
mode.
If a vehicle enters Channel 1 Loop and then proceeds to Channel 2 Loop, Channel 1 relay
contacts will close for the duration of that the vehicle is over Channel 2 Loop.
If a vehicle enters Channel 2 Loop and then proceeds to Channel 1 Loop, Channel 2 relay
contacts will close for the duration of that the vehicle is over Channel 1 Loop.
Progress of a vehicle over the loops
Case 1:
(AB LOGIC Presence Mode)
Forward direction
A - Vehicle Enters Loop1
B - Vehicle Exits Loop 1,
C - Vehicle Enters Loop2,
D - Vehicle Exits Loop 2,
Typically caused by loops
being too far apart or very
small vehicles
Summary of Contents for PD230 Enhanced Vehicle Detector
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