DSP-10 User Manual
Page 7 of 26
DSP10_MAN_C
4. Features and Functions
Detector Reset
When any of the 10-position DIP switches or the 10-position rotary switch is changed, the detector will perform
a detector wide reset. Both LEDs will turn off for 500 milliseconds at the start of the reset event, then on for 500
milliseconds, and then it will indicate if the internal setting is for Fail-Safe or Fail-Secure configuration of the
detector. For Fail-Safe the LEDs will be on for another 500 milliseconds then off for 500 milliseconds before
returning to their normal states. For Fail-Secure the LEDs will flash at 50 milliseconds on and 50 milliseconds off
rate for another 1000 milliseconds before returning to their normal states. The detector will not output any
detections during this two second reset period. If a prior loop fault is being displayed it will be cleared. If a
vehicle is over the loop during the reset period it will not be detected.
Presence Detection
The A output will always operate in the presence detection mode. The Delay and Extend features may modify
the output behavior. Once activated, the output will remain activated as long as a vehicle is detected over the
loop. After four minutes of continuous detection, the detector will begin to slowly retune the detector with the
goal of tuning out the vehicle that stalled or parked on the loop over a relatively long time. The retuning process
takes about an hour to complete in the Normal Presence mode and about 19 hours in the Extended Presence
mode with a vehicle detection of 1% ΔL/L. When the retuning process is complete, any loop area that vehicles
can still travel over will still detect the vehicle as expected. Once the vehicle leaves, the detector will recover
from the retuning process within 1 second.
The B output can be set to operate in the True Presence mode. In this mode the B output activates as soon as a
vehicle enters the loop and drops as soon as the loop is no longer occupied. The output will ignore any Delay or
Extend features that are currently active.
Pulse Detection
The B output can be configured for Pulse on Entry or Pulse on Exit operation. The pulse generated by the output
will be 250 milliseconds long. The B output will follow any Delay or Extend features that are currently active.
Pulse operation is not available on the A output.
In Pulse on Entry mode, the B output will pulse when the A output activates. If the delay feature is enabled, the
pulse will not occur until the delay has timed out and the loop is still occupied. The output will not pulse again
until the loop has been unoccupied and any enabled extension has timed out.
In Pulse on Exit mode, the B output will pulse when the A output deactivates. If one of the extension features is
enabled, the pulse will not occur until the extension has timed out and the loop is still vacant. The output will
not pulse again until the loop has been reoccupied and any enabled delay has timed out.
