Grounding; External Equipment; Connection Of Data4 Port; In Case Of Rs-422 Level - Furuno GP-80 Installation Manual

4. WIRING

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, IBM-PC or DGPS beacon receiver as follows;

Connection of DATA4 port

In case of RS-422 Level

DATA4
TD-A
TD-B
RD-A
RD-B
S·G
In case of RS-232C Level
DATA4
NOTE: See page 15 for selection of input/output signal.
6
1
2
3
4
5
6
7
1
2
3
RD
4
NC
5
SD
6
S·G
7
RS-422 level
IBM PC
Beacon Receiver
NMEA equipment
RS-232C level
IBM PC
Beacon Receiver
NMEA equipment