12
GVI Security
The Dome Camera’s 22-pin connector definition is listed as shown below.
Pin
Definition
Cable
Pin
Definition
Cable
1
AC 24-1/DC (
＋
)
20AWG/18AWG
12 ALM-1
2 ALM
NC
13 ALM-3
3
AC 24-2/DC (
－
)
20AWG/18AWG
14 ALM-2
4 ALM
NO
15 ALM-4
5 FG
20AWG/18AWG
16 ALM-5
6 ALM
COM
17 ALM-6
7 T+
24AWG
18
ALM-7
8 R-
19 ALM-8
9 T-
20 ALM
GND
10 R+
21 VGND
20AWG
11 ISOG
22 Video
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.
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.
Pin
Corresponding Pins
(22-Pin Connector)
Definition
(Half-duplex)
Definition
(Full-duplex)
1
7,10
D+
R+
2
Reserved
Reserved
T+
3
Reserved
Reserved
Reserved
4
Reserved
Reserved
T-
5
8,9
D-
R-
