Furuno GP-80 Operator's Manual page 107

Load Requirements
Isolation:
Input Impedance:
Max. Voltage:
Threshold: 3mA (In case of FURUNO device talker connection)
Input Sentence is described on page C-11.
"DATA3" Port
The output signal of this port is changed by jumper JP4 and JP5 between
data out (IEC 61162-1/NMEA 0183 Ver.
In case of data out, the same data of DATA1 port (#1 & #2) is output.
Output Schematic Diagram (Talker)
20P8147
DATA3
MJ-A6SRMD
J6
FL5
TD-A
1
2
TD-B
FL6
3
4
5
6
Output Drive Capability
Max. 10mA
"DATA4" Port
IN/OUT signal is selected by the menu among the output of IEC 61162-1,
NMEA 0183 Ver. 1.5/Ver. 2.0, PC output/input and DGPS signal. Also, to
select DGPS signal, jumper JP3 is required to connect "external DGPS
receiver."
RS-232C or RS-422 level can be selected by the menu.
In case of output of IEC 61162-1, NMEA 0183 Ver. 1.5/Ver. 2.0,
Data format can be selected by the menu between IEC 61162-1 and
NMEA 0183 Ver. 1.5/Ver. 2.0.
Output sentence is described on page C-8 and C-9.
Each sentence is output at the interval entered.
opto coupler
470
15V
1.5/Ver. 2.0) and log pulse.
14
1 2
3 4
13
JP4
U35
SN75ALS172
12
C-15