DSP-50 User Manual
Page 17 of 27
DSP50_MAN_A
Figure 5: Power LED States
Detect A LED –
The red Detect A LED is used to display the status of Output A. There are several
different statuses that can be displayed on this LED:
Off
No vehicle present in the detection area or the detector has identified a
fault and has deactivated Output A because it is in fail-secure operation.
Reset in Fail-safe
At the start of a reset event (a DIP switch change, sensitivity change, or
power cycle) the LED will turn off for 500 milliseconds, on for 500
milliseconds, off for 500 milliseconds, on for 500 milliseconds, and then
finally display its normal state. Output A will be activated during this
time.
Reset in Fail-secure
At the start of a reset event (a DIP switch change, sensitivity change, or
power cycle) the LED will turn off for 500 milliseconds, on for 500
milliseconds, blink repeatedly with 50 milliseconds on followed by 50
milliseconds off for one second, and then display its normal state.
Output A will be deactivated during this time.
Delay Interval
A vehicle has been detected but Output A is not activated due to the 2-
second delay feature being active. The LED will turn on for 200
milliseconds and then off for two hundred milliseconds. If the vehicle
leaves the detection area before the two-second delay interval expires,
the LED will return to the off state. If the vehicle is still present after 2
seconds, the LED will become solid and Output A will be activated.