Video; Rs485 - Vidia PTZ User Manual

Video output of 1Vp-p is delivered at the female BNC end with 75 ohms impedance.
To transmit the video to receiver properly, it is recommended to use RG59 A/U
coaxial cable with stranded center conductor, with male BNC connectors on both
ends.
RG59 is also in 75 ohm impedance, which matches the
camera's output impedance. The A/U version is recommended,
rather than the version B/U, due of its superior performance on
flexibility for resisting severe twisting, bending and other
stresses which occur in many CCTV installations.
In case the installation distance is over than 500 meters (1,500 feet), additional
amplifier might be needed to keep the video level and image quality.
If superior video quality is strongly demanded, you may need to add the video buffer
for each 300 meters or even 250 meters.

RS485

7.3
The camera adapts RS485 in half-duplex pattern, a two-pin
yellow
connectivity as shown on the right picture.
+
Installer must pay attention to the polarity of these two pins –
--
yellow wire is the POSITIVE end, and orange is the
NEGATIVE. Communication between controller and camera orange
will break and control will not function if they are reversely
connected.
The RS485 communication may run for 4,000 feet if the system network is properly
built. Two important factors should be handled with care during the system
build-up--- baud rate and termination impedance. More information about RS485
are in sections "Protocol and Baud rate" and "Applications".
&
Alarm Input Alarm Output
7.4
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