Silicon Graphics 2400, Owner'S Manual

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Chapter 3: Interface and Cabling Information
Standard Serial Ports
Each SGI 2400 and 2800 rackmount system comes with two standard 9-pin serial ports.
These ports can support either RS-232 or RS-422 interface devices. Figure 3-2 shows the
location and pinouts for a serial port. Optional additional serial ports are also available.
The RS-232 standard recommends the use of cables no longer than 50 feet (15.2 meters).
This standard should also be applied to the RS-422 connections. Longer runs increases
the possibility of line noise which can affect data transmission and cause errors. For cable
runs longer than 50 feet (15.2 meters), use an appropriate extender device.
Note:
Do not run cables through areas that are electrically noisy, such as places s where
large electric motors, welding apparatus, or X-ray machines operate. Bury outside wiring
in conduit, as lighting strikes can damage the system.