Furuno FR-8045 Installation Manual page 29

2.4.2 NMEA1 ports
Transmitter
This port complies with "IEC 61162-1 Ed4".
Parameter Rating
"H" level -60mA
output current
"L" level 60mA
output current
Differential 1.5V (MIN)
output voltage 5V (MAX)
Receiver
This port complies with "IEC 61162-1 Ed4".
Parameter Rating
Forward 50mA
Current
Reverse 6V
Voltage
Forward 1.1V (TYP)
Voltage 1.4V (MAX)
2.4.3 NMEA2 ports
This port complies with "IEC 61162-1 Ed4".
Circuit specification is the same as NMEA1 port.
Remarks
Absolute
Maximum
Absolute
TD1_A
Maximum
Load 54Ω
TD1_B
Remarks
Absolute
Maximum
RD1_H
Absolute
Maximum
I =4mA
RD1_C
F
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2. CABLE CONNECTION AND WIRING
Circuit Diagram
Differential Driver
Circuit Diagram
490Ω
Photocoupler