Cabling; Traditional Wiring Using Coaxial Cable For Video; Video Cabling - Videotec MDI Manuel D'instructions

Installation should only be done by qualified service personnel. Any changes, or modifications made to this
product not expressly approved by the manufacturer will void the warranty and invalidate the authority for
its use.

5.2 Cabling

This product is designed to be cabled either with traditional wiring using coaxial cable for video transmission or
with CAT-5 cable that uses twisted pair video transmission. Please follow the appropriate instructions below.
Confirm the cable requirements for the selected telemetry controller prior to installing cables. This will help
ensure the use of the correct cable types and sufficient conductors. This product will function with both RS-
422 and RS-485 telemetry protocols.
Be aware that RS-422 telemetry systems may require either two or four wires. Simplex RS-422 telemetry
systems require only two wires, known as a single twisted pair, because telemetry information (commands)
moves only from the controller (keyboard) to the controlled device (dome).
Duplex (or half-duplex) RS-422 telemetry systems require four wires, known as two twisted pairs. One twisted
pair carries telemetry information (commands) from the controller (keyboard) to the controlled device (the
dome). A second twisted pair carries information (responses) originating the controlled device (dome) to the
controller (keyboard).
RS-485 telemetry systems always use two wires, known as a single twisted pair regardless of whether they use
simplex or half-duplex communication techniques. This is because RS-485 systems employ sophisticated
methods to eliminate or control collisions in the data sent from the controller (or keyboard) to the controlled
device (dome) and from the controlled device/s (dome/s) back to the controller.

5.3 Traditional wiring using coaxial cable for video

The fixed-wiring of the installation should be connected to the dome using the supplied pigtail cable as
described below. The pigtail cable is to be plugged into the RJ-45 connector labelled "CONTROLLER".

5.3.1 Video cabling

The video connection of the pigtail cable is terminated with a female BNC connector. Site wiring should be
RG59/BU coaxial cable (or equivalent) terminated with a male BNC connector. To ensure good quality video
signals please adhere to the cabling distances shown in Table 1 – Video cabling distance.
Figure 1 – Pigtail break-out cable
Cable type Maximum distance
RG59/BU 305 Metres (1000 feet)
RG6/U 305 Metres (1000 feet)
RG11/U 460 Metres (1500 feet)
Table 1 - Video cabling distances.
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