DSP-15 User Manual
Page 12 of 23
DSP15_MAN_C
Sensitivity Boost (DIP Switch 7)
The detector has a user selectable feature that increases the sensitivity of a channel after initial detection. This
feature is most often used to allow a detector to have a lower starting sensitivity and then increase it after a
vehicle has been detected. This is useful in situations where high-bed tractor-trailer vehicles will be passing over
the loop. With this feature the detector may be able to detect the high-bed portion of the vehicle without
having to be overly sensitive and susceptible to false detections. NOTE: If detection of high-bed tractor-trailers
is required, correctly sized loops must be used.
Extension (DIP Switches 8 and 9)
Extension is the time added after a vehicle leaves the detection area. During this interval, the A output will
remain activated, with the intent of allowing the vehicle to fully exit the detection area before the gate begins to
close. If another vehicle arrives during this extension interval, the remainder of the extension time is canceled,
and the detector returns to the normal presence state. This interval is indicated by the red Detect LED blinking
fast at 50 milliseconds on followed by 50 milliseconds off repeated until the interval is complete. There are four
intervals to choose from: No extension, 2 seconds of extension, 5 seconds of extension, and 10 seconds of
extension. The choices are summarized in the table below.
DIP Switch
Output A
Extension Time
8
9
OFF
OFF
0 seconds
ON
OFF
2 seconds
OFF
ON
5 seconds
ON
ON
10 seconds
2 Sec. Delay (DIP Switch 10)
Delay is the time added after a vehicle arrives in the detection area but before the A output is activated. During
the delay interval the A output relay will remain de-activated, requiring that the vehicle stay in the detection
area for a full 2 seconds before activating the A output. This is useful at sites where vehicles traveling
perpendicular to the gate may travel across the detection zone. This interval is indicated by the red Detect LED
blinking slowly at 200 milliseconds on followed by 200 milliseconds off repeatedly until the interval is complete.
The delay interval is fixed at 2 seconds.
