Cabling Requirements under SCO Xenix and SCO
Unix
Over recent weeks we have received numerous calls about cabling to
serial ports (on-board, Chase or Specialix). In view of the apparent confusion, the
following is the specification to which all installations should conform.
- All RS232 cables running at 9600 baud should not exceed 50 feet.
- Cable lengths in excess of 50 feet should make use of line drivers. We do
not advise line drivers are powered from a pin on the serial port, the best line drivers
always have an independent power supply.
- Cabling should always contain a shield which is connected to pin 1 at one
end of the cable only.
These three items assume the cable is laid in an environment away from
mains power. The introduction of mains power into the same area can prevent the serial
lines behaving normally and may require the baud rate to be reduced significantly. Never
use the same ducting for serial cables and mains power.
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