DVR systems DVRxx04HF-A Series - Manual (Page 48)

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485 A/B 485 communication port. They are used to control devices such as
PTZ. Please parallel connect 120TΩ between A/B cables if there are
too many PTZ decoders.
The 16-channel interface is shown as in Figure 3-7.
Figure 3-7
Please refer to the following sheet and Figure 3-7 for detailed information.
In the second line,
from the left to the
right,: 1，2，3，4，
5，6，7，8.and the
first line from the left
to the right : 9，10，
11，12，13，14，
15，16 ALARM 1 to ALARM 16. The alarm becomes active in low voltage.
In the first line, from
the left to the right:
3-NO C，and the
second line from the
left to the right 1-
NO C，2-NO C. There are three groups of normal open activation output (on/off
button)
Earth cable.
485 A/B 485 communication port. They are used to control devices such as
PTZ. Please parallel connect 120TΩ between A/B cables if there are
too many PTZ decoders.
3.8.1.2 1.5U Series
The 1.5U series product interface is shown as in Figure 3-8.
Figure 3-8
You can refer to the following sheet and Figure 3-8 for alarm input and output information.
In the first line, from
the left to the right,: ALARM 1 to ALARM 16. The alarm becomes active in low voltage.
AB cable
connection
AB cable
connection