RS-422 serial line connection using five wires
An RS-422 serial line connection can transmit data at rates as high as 10 million bits per second, and may be sent on cables as long as 1500 meters.
Note
This connection is specific for the HT20470 computer.
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A Local connection
B Connection on remote device (For more information, refer to the end-user documentation provided by the manufacturer.)
C Female 9-pin D-Subminiature connector
D Male 9-pin D-Subminiature connector
Unless otherwise specified, this cable must be provided by the installation shipyard.
Minimum cable requirements
•  Conductors2 x 5 x 0.5 mm2
•  ScreenOverall braided 
•  Voltage: 60 V
•  Maximum outer diameterDefined by the plugs and/or the gable gland
If you wish to use RS-422 or RS-485 serial communication, use a cable with twisted pairs. If you need to install a very long cable, increase the cross section.