Seatalk Or Nmea Data Input And Output - Raytheon RayChart 620 Operation Manual

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The information is passed in "sentences", each of which has a three-
letter identifier. When you check to see if one piece of equipment will
"talk" to another, make sure that the two pieces of equipment both use
the same identifiers. For example, VTG carries Course and Speed
Over Ground data, GLL carries latitude and longitude, DBK carries
depth below the keel, and VWR carries relative wind angle and wind
speed data.
The NMEA 0183 standard has a similar data rate to SeaTalk, and
carries similar information. However, it has the important difference that
one cable will only carry information in one direction, so two cables are
required to transfer data in both directions between equipment. For this
reason NMEA 0183 is generally used to connect a data receiver and a
transmitter together: for example, a compass sensor transmitting
heading to a radar, or a GPS sensor (or Chart Plotter) transmitting
position and navigation data to a radar.
A.2 SeaTalk or NMEA Data Input and Output
The RayChart 620 can be configured to operate in one of three different
operating modes. The data input and output in each mode is detailed in
the table on the following page.
Note: When making connections to the RayChart 620, you can use
either SeaTalk input/output or NMEA input/output, but not both. If you
wish to use both types of data, you must connect the NMEA equipment
via a unit such as a RayData or NMEA bridge, that repeats NMEA data
in SeaTalk format. If you use NMEA data output, you cannot also
connect a printer.
RayChart 620