User's Manual
33
The voltage between of A, B lines of the decoder should be less than 5 V.
Making sure the front-end device has soundly earthed
Improper grounding may result in chip damage.
4.3.1 Introducing Alarm Port
The alarm input ports are dependent on the model you purchased.
Alarm ports
Table 4-1 Alarm port description
1,2,3,4,5,6,7,8,9,10,11,
12,13,14,15,16
ALARM 1 to ALARM 16. The alarm becomes active in low voltage.
NO1 C1, NO2 C2, NO3
C3, NO4 C4
There are four groups of normal open activation output (on/off button).
NO5 C5 NC5, There is one group of normal open activation output (on/off button).
CTRL 12V
Control power output of the 6th alarm output channel. Voltage current: 500
mA.
When there is an alarm output, close the power output.
When the alarm is cancelled, open the power output.
+12V
Rated current.
Voltage current: 500 mA.
Ground cable.
485 A/B
485 communication port. They are used to control devices such as decoder.
120Ω should be parallel connected between A, B lines if there are too many
PTZ decoders.
T+,T-,R+,R-
Four-wire full-duplex RS-485 port.
T+ T-: output wire.
R+ R-: input wire.
4.3.2 Alarm Input
Please refer to the following figure for more information.
Grounding alarm inputs which includes Normal open and Normal close type.
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