RS-232 serial line connection using five wires
An RS-232 serial line connection using NMEA datagrams is a common way to connect the SU90 system to external devices.
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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. Note that this cable does not support all the signals in the standard RS-232 specification.
Minimum cable requirements
•  Conductors: 2 x 4 x 0.5 mm2
•  Screen: Overall braided 
•  Voltage: 60 V
•  Maximum outer diameter: Defined by the plugs and/or the gable gland
If you need to install a very long cable, increase the cross section.