Furuno FMD-3200 Operator's Manual page 453

Serial Interface
TD-A
TD-B
LTC1535
ISOGND
RD-A
RD-B
110 ohm*
470 ohm
RD-H
PC-400
RD-C
Processor Unit, Sensor Adapter: IEC 61162-2/1 input/output
470 ohm
RD-H
RD-C
Processor Unit, Sensor Adapter: IEC 61162-1 input
SN65LBC172
Processor Unit, Sensor Adapter: IEC 61162-1 output
* Set with jumper.
Switchable open/close.
PC-400
10 ohm 10 ohm
TD-A
10 ohm
TD-B
APPENDIX 3 DIGITAL INTERFACE
AP-33