Raytheon RayChart 620, Operation Manual, Page: 106 / 121

93 Appendix A: Data Input and Output
Appendix A: Data Input and Output
In addition to the data received from the position fixer, the RayChart 620
can display information received via the NMEA or SeaTalk connections,
and also output data.
This appendix provides information on the data standards, and the data
input and output when your RayChart is part of an extended system. It
also provides information on the Loran GRIs.
Note: The Test option allows you to display the data currently being
received/transmitted by the RayChart via either SeaTalk or NMEA, as
described in Chapter 8.
A.1 Data Standards
The RayChart 620 is compatible with two data standards: Raytheon’s
own SeaTalk
® , and the National Marine Electronics Association
(NMEA) 0183 interconnection standard.
SeaTalk
A few years ago, on-board electronic instruments were “stand-alone”.
The information they provided was only available in one location, and
could not be shared easily with other instruments or navigation
equipment.
The SeaTalk standard was developed by Autohelm (part of the
Raytheon group), and allows compatible instruments to be connected
by a single wire carrying power and data. This means that additional
instruments and functions can be added to a SeaTalk system, simply
by plugging them into the network.
SeaTalk is a precise, high-speed protocol which is flexible enough to
adapt to any number of instrument heads, without a central processor.
SeaTalk equipment can also communicate with non-SeaTalk
equipment via the NMEA standard.
NMEA
The NMEA 0183 Data Interface Standard was developed by the
National Marine Electronics Association of America. It is an international
standard that enables equipment from many different manufacturers to
be connected together and to share information.