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System Notes – 2 wire COLOR: Important Information on Monitor Riser Connections
This section discusses the proper procedure for connecting monitors on a riser.
Although a digital system is very forgiving, it is best to follow these rules during installation to
maximize performance and minimize potential problems.
Using existing wiring:
When using existing wiring there are many things that can cause problems. The first is
of course, wiring condition and gauge. Solid or stranded does not matter but a minimum of
18 gauge twisted shielded wire with the shield NOT connected together is strongly
recommended. Using any lighter gauge may result in loss of performance and/or
introduction of interference from outside power sources.
Many installers run the cable the easiest way and this, unfortunately, is usually by
running the wire in a conduit or small enclosure right along side AC power lines, near
fluorescent ballasts, or machinery. It is therefore suggested that you run your own wiring
for this job in the recommended way, and avoid wiring with unknown potential issues. If
this is not possible, it is best to advise the customer that the system may not work up to its
full potential especially with regard to video display.
Proper BUS Connections to the Monitors:
Although the polarity of the BUS connections on a monitor on a line is not important, it
is good form to reverse the connections from monitor to monitor on a BUS line to prevent
the propagation of signal distortion by putting them "out of phase" with each other. On the
picture below, note how the monitors are "reverse connected" as they go up a riser.
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