2
ii
Front Panel DIP Switches (Both Channels)
Switch
ON
OFF
Factory Default
1
Frequency
(See Table under Frequency Section)
OFF
2
OFF
3
Pulse Mode
Presence Mode
OFF
4
Sensitivity Boost
No Boost
OFF
5
Sensitivity
(See Table under Sensitivity Section)
ON
6
OFF
Frequency (DIP Switches 1 and 2)
Loops connected to channels 1 and 2 of a Model AX2DL-XP detector
cannot
crosstalk (i.e. interfere with each
other). In situations where loop geometry forces loops to be located in close proximity to one another and the
loops are connected to different detectors, it may be necessary to select different frequencies for each loop to avoid
loop interference. DIP switches 1 and 2 can be used to configure the detector to operate at one of four frequencies
corresponding to
Low
,
Medium / Low
,
Medium / High
, and
High
as shown in the table below.
NOTE: After changing any frequency switch setting(s), the detector must be reset by momentarily changing
one of the other switch positions or pressing the front panel
RESET
pushbutton.
Switch
Frequency
Low (0)
Medium / Low (1)
Medium / High (2)
High (3) *
1
ON
OFF
ON
OFF *
2
ON
ON
OFF
OFF *
* Factory default setting.
Presence / Pulse Mode (DIP Switch 3):
Each channel has two modes of operation, Presence or Pulse. When in Pulse mode (DIP switch 3 set to
ON
), a 250
millisecond pulse is output each time a vehicle enters the loop detection area. When in Presence mode (DIP switch
3 set to
OFF
), the channel’s output operates in True Presence
TM
Mode and the detector channel will hold a Call
output as long as a vehicle is present and power is not removed or reset applied. True Presence
TM
hold time applies
only for normal size automobiles and trucks and for normal size loops (approximately 12 ft
2
to 120 ft
2
). The
factory default setting is
OFF
(Presence Mode).
Sensitivity Boost (DIP Switch 4)
DIP switch 4 can be turned
ON
to increase sensitivity during the detect period without changing the sensitivity
during the no detect period. The boost feature has the effect of temporarily increasing the sensitivity setting by up
to two levels. When a vehicle enters the loop, the detector automatically boosts the sensitivity level. As soon as no
vehicle is detected, the detector immediately returns to the original sensitivity level. This feature is particularly
useful in preventing dropouts during the passage of high bed vehicles. The factory default setting is
OFF
(no
Sensitivity Boost).
Sensitivity (DIP Switches 5 and 6)
Each channel has four (4) sensitivity levels. DIP switches 5 and 6 select one of the four sensitivity levels available
as shown in the table below. Use the lowest sensitivity setting that will consistently detect the desired type(s) of
vehicle(s) that must be detected. Do not use a sensitivity level higher than necessary.
Switch
Sensitivity Level (-
ΔL/L)
0.32% (0)
0.16% (1) *
0.08% (2)
0.02% (3)
5
OFF
ON *
OFF
ON
6
OFF
OFF *
ON
ON
* Factory default setting.
III
Reset
Pushing the front panel mounted pushbutton labeled
RESET
or changing any DIP switch (except 1 or 2) will reset
the detector. After changing the frequency selection DIP switches, the detector must be reset.
IV
Power Down Memory
When power is removed, the detector automatically remembers the status of the loop. During the loss of power,
vehicles may enter or leave the loop detection area. When power is restored, the detector will correctly determine
the current loop status and output a Call if a vehicle is in the loop detection area. If the loop detection area is
vacant, a Call will not be output. (A power loss power dip of any duration will not bring a gate arm down onto cars
as they wait at the gate).
IMPORTANT: After installing and applying power to the Model AX2 detector,
momentarily push the RESET button to clear the Power Down Memory. This initializes the detector to the loops
that are connected and clears the memory of any previous loop information.
V
Failed Loop Diagnostics
Each channel’s
DETECT
LED indicates whether or not the loop connected to the channel is currently within
tolerance. If the loop is out of tolerance, the LED indicates whether the loop is shorted (one Hz flash rate) or open
(10 Hz flash rate). If and when the loop returns to within tolerance, the
DETECT
LED will flash at a three flashes
per second rate to indicate that an intermittent loop fault has occurred and has been corrected. This flash rate will
continue until another loop fault occurs, the detector is reset, or power to the detector is interrupted. If a vehicle
enters the loop detection area while the
DETECT
LED is indicating an intermittent loop failure, the
DETECT
LED will turn on to indicate the presence of the vehicle.
