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Cabling Guide C
Cabling Guide
The following guide describes pinouts and cables for the
Desktop Terminal Server (DB25), Rack Terminal Server
(RJ45) and 102/104 Terminal Server (RJ45) units. Versions
equipped with RJ45 connectors are also available as
RS-422 units.
Any cable you use should be shielded to comply with FCC
requirements. Be careful not to run data cables near
fluorescent lights, electric motors or other sources of
electrical noise.
Maximum cable lengths for RS-232 are specified at 60m
(200 feet) but are proportional to baud rates - the higher the
baud, the smaller the cable should be. A good rule of thumb
is that a 19200 bps connection should not be used on cable
lengths in excess of 15m (50 feet). Also, a 9600 bps signal
operates reliably up to a distance of approximately 30m
(100 feet). Cables of greater lengths may seem to work
correctly but the connection will be less reliable.
For reliable RS-422 operation, signal ground must be
connected at both ends of the cable. Maximum cable length
is 1.2 km but at 115.2 kbs it is reduced to 1 km.
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