User's Manual

306UM0002 - 01 TD236 Enhanced Detector User Manual Page 17 of 35
If a vehicle enters Channel 1 Loop and then proceeds to Channel 2 Loop, a
150 ms pulse will be issued on Channel 1 relay output as the vehicle leaves
Channel 1 Loop.
If a vehicle now enters Channel 2 Loop and then proceeds to Channel 1 Loop, a 150 ms
pulse will be issued on Channel 2 relay output as the vehicle leaves Channel 2 Loop.
Progress of a vehicle over the loops
Case 1: (AB LOGIC Pulse 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
Case 2: (AB LOGIC Pulse Mode)
Forward direction
A - Vehicle Enters Loop1
B - Vehicle Enters Loop2
C - Vehicle Exits Loop 1
D - Vehicle Exits Loop 2
This is the correct forward
operation for Pulse
AB Logic
Case 3: (AB LOGIC Pulse Mode)
Reverse direction
A - Vehicle Enters Loop2
B - Vehicle Exits Loop 2
C - Vehicle Enters Loop1
D - Vehicle Exits Loop 1
Typically caused by loops
being too far apart or very
small vehicles