On Jul 18, 11:24*am, "claus" wrote:
"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.

Right - just to clarify a couple of things:
1. AIS Receivers do not need GPS signals to output AIS sentences. They
work independent of GPS.
2. With the SR161/SR162, you can feed GPS (or any other NMEA data)
into the AIS receiver at 4800 baud on pin 3 and the receiver will
combine the data with the AIS sentences and output the combined
datastream out the single serial port at 38400 baud on pin 2 with a
common ground on pin 5. We sell a cable to do this and also include
the wiring diagram to build your own. See:
http://www.milltechmarine.com/images...ng-diagram.pdf


Doug Miller
Milltech Marine