DVR systems DVRxx04LE-A Series - Manual (Page 28)

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One type of the alarm port is shown as in Figure 3-6.
Figure 3-6
You can refer to the following sheet for alarm input and output information.
Parameter
Grounding Alarm
Ground line
Alarm Input 1, 2, …, 8. It becomes valid in low voltage.
1-NO C，
2-NO C，
3-NO C Three NO activation outputs.
485 A/B 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.
The other type of the alarm port is shown as in Figure 3-7.
Figure 3-7
You can refer to the following sheet for alarm input and output information.
Parameter
Grounding Alarm
Ground line
Alarm Input 1, 2, …, 16.. It becomes valid in low voltage.
1-NO C，
2-NO C，
3-NO C Three NO activation outputs.
485 A/B 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.
3.7.2 Alarm Input Port
Please refer to the following sheet for more information. See Figure 3-8.
z
Normal open or Normal close type
AB Connection
port
AB connection
port