302UM0017 Rev 01
PD230 Enhanced Detector User Manual
Page 20 of 37
Case 5:
(AB LOGIC Presence Mode)
Forward direction
A - Vehicle Enters Loop1
B - Vehicle Enters Loop2
C - Vehicle Starts to reverse
D - Vehicle Exits Loop 2
E - Vehicle Exits Loop 1
This case should not
happen but it does
occasionally
Case 6:
(AB LOGIC Presence Mode)
Reverse direction
A - Vehicle Enters Loop2
B - Vehicle Enters Loop1
C - Vehicle Starts to reverse
D - Vehicle Exits Loop 1
E - Vehicle Exits Loop 2
This case should not
happen but it does
occasionally
4.3.4 AB Logic Pulse Mode (Counting Logic)
Internal link LK1 shorted from Pin 2 to Pin 3. In this mode switches 9 & 10 are ignored.
AB LOGIC Pulse 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.
This mode is used to activate equipment requiring vehicle direction inputs such as automatic
fee collection equipment, vehicle counters, or warning devices in one-way systems.
Summary of Contents for PD230 Enhanced Vehicle Detector
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