6
Pan, Tilt and Zoom Dome Camera / ACD-1500-HT35
RS-485 communication
RS-485 communication is used to control a PTZ camera. Standalone DVRs, PC-based DVRs,
keyboard joystick PTZ controllers, video servers, and a variety of other CCTV equipment usually have
an RS-485 interface (push terminals, D-Sub connector, etc.) for PTZ control. The CCTV equipment
transmits control signals while the PTZ camera receives the signals and performs the function
required.
RS-485 utilizes two wires; a ‘+’ wire and a ‘–’ wire. These two wires may also be label or
reference as:
•
+ and –
•
D+ and D-
•
A+ and B-
•
RS485+ and RS485-
To make the physical connection from the controlling device (DVR, keyboard controller, etc.) to
the PTZ, simply connect the RS485 ‘-’ from the controlling device to the RS485 ‘-’ on the PTZ. Do the
same for the RS485 ‘+’. Any type of wire can be used for the connection, but 0.56mm (24AWG)
twisted pair is recommended.
+
+
-
-
PTZ
Physical Connections
Controller
PTZ and RS-485 Basics
2
Physical Connection
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