Neltronics DVR-4000HDQ, Руководство по эксплуатации

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3 、 If Alarm input 1 is active and combined with Alarm output 1, the Alarm output
1 will output a high-level voltage to trigger other device.
4
、
SPEED+&SPEED-
These 2 cable is for speed detection and needs to connect to speed line on vehicle.
Check the real-time vehicle speed with the vehicle speedometer:
Wiring diagram:
The vehicle speedometer is driven by the Speed sensor, see the right figure.
If the speedometer has a speed signal output, it can be connected directly to the
PIN17 of the DB26 cable and PIN18 for reference level.
If the speedometer does not have the speed signal output, then connect SIG Output
of the speedometer which is output by Speed sensor to the PIN17.