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The Dome Camera's 22-pin connector definition is listed as shown below.
Pin
1
2
3
4
5
6
7
8
9
10
11
2.7 RS-485 Connector Definition
RS-485 is the interface that communicates the analog PTZ Dome Camera and its control device. Please
connect the control keyboard to the PTZ Dome Camera through the terminal block. The recommended
cables for RS-485 communication are CAT 5 cables; maximum cable length for over 24-gauge wire is 4000
feet (1219 meters). If the total cable length exceeds 4000 feet, using a repeater to maintain the signals is
recommended. Please refer to the figure and table below for pin definition.
Pin
1
2
3
4
5
The factory default setting of connection is Half-duplex. Using Full-duplex requires the adjustment of the data
cable. Unplug and plug the T+/T- connections to the corresponding points.
NOTE: Revise the RS-485 setting prior to restarting the Dome Camera. Refer to 2.3 Communication Switch
Settings for more details.
Definition
Cable
20AWG/18AWG
AC 24-1/DC (＋)
ALM NC
20AWG/18AWG
AC 24-2/DC (－)
ALM NO
FG
20AWG/18AWG
ALM COM
T+
R-
24AWG
T-
R+
ISOG
Corresponding Pins
(22-Pin Connector)
7,10
Reserved
Reserved
Reserved
8,9
Pin
12
13
14
15
16
17
18
19
20
21
22
Definition
(Half-duplex)
D+
Reserved
Reserved
Reserved
D-
Definition
Cable
ALM-1
ALM-3
ALM-2
ALM-4
ALM-5
ALM-6
ALM-7
ALM-8
ALM GND
VGND
20AWG
Video
Definition
(Full-duplex)
R+
T+
Reserved
T-
R-
12
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