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4.3RS485 port connection
If you want to control pan-tilt, lens and process the relay of the alarming signals by the DVR, the 25-pin RS485 connection can
realize. RS485 connection can control various pan-tilt decoders, and the specific type of the decoder can be selected from the
Control of the System setting in the menu. On DB25 plug the foot ’s serial number is marked. The definition of the foot is as
following（ The broken line in the graph means being connected inside.）
a) 1、 14、 2、 15、 3、 16、 4、 17 connects to alarm input: ALARM1~ALARM8；
b) 5、 18-OUT1， 6、 19-OUT2 two linked normally open output:
c) 7、 20-OUT3 are two attached inner lines， either foot is controllable +12V output；
d) 8、 9、 21 are +12V power output, able to be taken as the power supply for alarm sensor；
e) either foot of 10、 22 is the B line of RS485, either foot of 11、 23 is the A line of RS485;
f) 12、 13、 24、 25 are earth lines.
Combined as RS485 B line
Combined as RS485 A
Decoder
Decoder
A B
A B
Alarm input ALARM1
┆
┆
ALARM8
Alarm output
ALARMOUT1
ALARMOUT2
Controllable +12V output
+12V output
Earth line
120 Ω
（ suggested）
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