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5. WIRING
11
Grounding
The display unit contains several CPUs. While they are operating, they radiate noise, which
can interfere with other radio equipment. Ground the unit as follows to prevent it.
• The grounding wire should be 1.25sq or larger.
• The grounding wire should be as short as possible.
External Equipment
The DATA1, DATA2, and DATA3 ports are used to connect an external equipment such as
autopilot, remote display, navigation equipment. Refer to the interconnection diagram on
page S-1 for connection of DATA1, DATA2 and DATA 3 port. The DATA4 port is used to
connect NMEA equipment, PC or DGPS beacon receiver as follows;
Connection of DATA4 port
DATA4
TD-A
TD-B
RD-A
RD-B
S·G
1
2
3
4
5
6
7
RS-422 level
PC
Beacon Receiver
NMEA equipment
In case of RS-422 Level
DATA4
RD
NC
SD
S·G
1
2
3
4
5
6
7
In case of RS-232C Level
RS-232C level
PC
Beacon Receiver
NMEA equipment
NOTE: The selection of input/output signal level is done by menu operation. See page 19.