Rs-232 Serial Line Using Three 3 Wires And Rj45 Connector - Kongsberg EM 2040 Installation Manual

Kongsberg EM 2040
RS–232 serial line using three 3 wires and RJ45 connector
An RS-232 serial line connection using three –3– wires and NMEA telegrams is probably
the most common way to connect the EM 2040 to external devices.
GROUND
RX
TX
A Local connection
B Connection on
peripheral device
C Female 9–pin
D-connector
D Male 9–pin
D-connector
E RJ45 connector
Note that this cable does
not support all the signals in the standard RS-232 specification.
Unless otherwise specified, the serial line cable must be provided by the installation
shipyard.
Important
When you are using RS-232 serial communication, observe that long runs of unshielded
cable will pick up noise easily. This is because the RS-232 signals are not balanced.
Maximum length is typically 60 meters with 2400 bps data rate, but this depends on the
cable quality. Always check the cable manufacturers specifications for the actual "shunt
capacitance". A common figure is 47.5 pF/m, which gives a maximum cable length
of about 50 meters.
Note
Even though a standard exist for RS-232 pin configuration, certain manufacturer may
still choose their own connector pins for the various signals used. In order to make the
RS-232 connection to your peripheral device work properly, you must always consult the
relevant instructions provided by the device manufacturer.
28
Pin 8
Pin 1
(CD0801_001_004)
RX
TX
GROUND
5 1
9 6
1 5
6 9
(CD0801_001_002)
391932/C