"claus" wrote in message
. ..

"Peter Bennett" wrote in message
news
Note that normal NMEA-0183 data is sent at 4800 baud, while AIS data
is normally sent at 38400 baud - they can't coexist on the same
circuit. My Raymarine C80 chartplotter/radar display can accept AIS
data at 38400 on its serial port, while the GPS and other NMEA-0183
data goes into the SeaTalk system via a Raymarine NMEA=SeaTalk
interface box.

Peter,

The SR161 can be used to consolidate incoming NMEA positional data from a
GPS with the AIS NMEA data into a combined high-speed data stream on a
single serial port.

In that scenario there is no need for any multiplexer.

Forgot to add the link to the Wiring diagram for connecting a GPS into the
AIS receiver using a Single Serial Port on the Computer:

http://www.milltechmarine.com/images...ng-diagram.pdf