Honeywell HD-16DVR-C - Manual (Page 36)

Installation and Connections
20
Figure 3-1 Alarm Input and Output
Parameter Grounding Alarm
Ground line
Alarm Input 1-16 become valid in low voltage.
Relay Output
1-4 NO C: four Normal Open activation outputs.
5 NO C NC: Normal Open – Normal Closed dual activation
output
Ctrl 12V
Controllable +12VDC power output as the 6th alarm output
channel. When the alarm output is ON, the power output is cut
off.
+12V +12VDC power output for external equipment (less than 1A).
RS-485 A/B
RS-485 communication port. They are used to control devices
such as PTZ. Please parallel connect 120Ω between A/B
cables if there are too many PTZ decoders.
Alarm Input Port
16-channel grounding alarm inputs. (Normal open or Normal close type)
Please parallel connect COM end and GND end of the alarm detector
(Provide external power to the alarm detector).
Please parallel connect the ground of the DVR and the ground of the alarm
detector.
Please connect the NC port of the alarm sensor to the DVR alarm input
(ALARM)
Use the same ground with that of DVR if you use external power for the
alarm device.