2–13Installation
Publication 1203–5.1 –– July, 1997
Twinaxial cable used for remote I/O (RIO) and Data Highway+
(DH+
TM
) communications represents a communications
transmission line in which certain characteristics exist. The following
are some general guidelines that must be adhered to in order to
obtain the best results.
Cable Type – Only 1770-CD Belden #9463 is approved for RIO and
DH+ installations. All other cable types or manufacturers, no matter
how similar, are untested. Using other cable types is strictly at your
own risk.
Important: The transmission rate determines the maximum cable
length.
Table 2.C
Twinaxial Cable Guidelines
Remote I/O link
communications rate
Cable length
cannot exceed:
57.6 kbps
115.2 kbps
230.4 kbps
3,048 m (10,000 ft)
1,524 m (5,000 ft)
762 m (2,500 ft)
Connections – Connect all three conductors, blue, clear, and shield,
at each wiring point. No additional ground connections should be
made to the shield.
Important:
DO NOT use star type connections. Only two cables
may be connected at any wiring point on a series
connection application.
OK
These are general rules and certain deviations may be warranted
because diverse installation and environmental concerns could
change the requirements.
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