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NMEA 0183 implementations vary, but can often interoperate with RS-232, RS-423, and RS-422. Electrical characteristics (physical layer) Third-party switches are available that can establish a primary and secondary talker, with automatic failover if the primary fails.Īt the application layer, the standard also defines the contents of each sentence (message) type so that all listeners can parse messages accurately.ġ Electrical characteristics (physical layer) Through the use of intermediate expanders, a talker can have a unidirectional conversation with multiple listeners, and using multiplexers, multiple sensors can talk to a single computer port. The NMEA 0183 standard uses a simple ASCII, serial communications protocol that defines how data is transmitted in a "sentence" from one "talker" to one "listener" at a time. It has been defined by, and is controlled by, the U.S.-based National Marine Electronics Association. ![]() NMEA 0183 (or NMEA for short) is a combined electrical and data specification for communication between marine electronic devices such as echo sounder, sonars, anemometer (wind speed and direction), gyrocompass, autopilot, GPS receivers and many other types of instruments. However the small size of the window makes it fully visible on even the lowest resolution laptops :-)
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