NMEA 0183 (the OLD standard used for marine electronics built PRIOR to 2005)
...is an interface "standard" used to define
- electrical signal requirements,
- data transmission protocol and time,
- and specific sentence formats for a 4800-baud serial data bus.
NMEA 2000 (the NEW standard used for marine electronics built AFTER 2005)
NMEA 2000® standard contains the requirements of a serial data communications network to inter-connect marine electronic equipment on vessels. The standard describes a low-cost moderate capacity bi-directional, multi-transmitter/multi-receiver instrument network to interconnect marine electronic devices.
It is multi-master and self configuring, and there is no central network controller. Equipment designed to this standard will have the ability to share data, including commands and status with other compatible equipment over a single channel. It is based on CAN (Controller Area Network). All NMEA 2000® products must be certified by NMEA. Although this standard is 50 times faster than NMEA 0183, it is not intended to support high-bandwidth applications such as video.
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