Serial Interface, Lan Adapter - Output Port - Furuno FCR-2107 Series Operator's Manual

Appendix 5: Digital Interface

Serial interface, LAN adapter - output port

AIS output port: Baud rate is fixed at 38400 bps. Complies with IEC 61162-2.
Other port: Baud rate is fixed at 4800 bps. Complies with IEC 61162-1.
Output port (TD-A, TD-B)
Isolated RS485 Transceiver
SP487
Logical High: A-B> +4.0V
Logical Low: A-B> -4.0V
Absolute maximum rating
Output
Supply voltage: 7V
High level output voltage: 7V
Low level output current: 50mA
AP-74
TD-A
TD-B
GND