
INST-164 Revision 4
Page 15 of 18
LED Location and Function
Figure 19: LED Location
DSP 1, Lit when a video input is detected. The LED is orange in colour. If this LED is not lit then you
should inspect your video cable and ensure that your camera is functioning correctly.
DSP 2, Lit when a live video stream is being provided to the sentry viewer, the LED is blue in colour.
During normal operation the live stream should be switched off, you should always ensure that DSP2 is
unlit after you have commissioned the unit.
DSP 3, Lit when a recognised number plate is present on the black/white list, the LED is orange in
colour.
DSP 4, Lit when a number plate has been processed, the LED is green in colour.
D1, unused
D2, unused
D3, Lit when the relay has been switched. The LED is orange in colour. When this LED is lit the relay is
energised and your barrier should operate, if this is not the case inspect all connections from the unit to
the barrier control box.
D4, unused
DSP_F, Indicates either a communications fault or a processing fault, this LED will flash continuously
when there is no network connection (however the unit should function normally i.e. licence plates are
processed). If the Reg-Sentry is not functioning normally (i.e. no licence plates are processed) and this
LED is flashing continuously then there is a fault with the unit and you should return the unit for repair.
This LED is green in colour.
POWER, this LED will flash briefly if there is a power fault. The LED colour is RED. During normal
operation this LED will be unlit. If this LED is lit, inspect all power connections.
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