21NMEA-NX2.doc Page 1 Latest update: 27 Jan -03
21. NEXUS NMEA 0183
NMEA Interface Standards are intended to serve the public interest by facilitating
interconnection and interchangeability of equipment, minimising
misunderstanding and confusion between manufacturers, and assisting
purchasers in selecting compatible equipment.
This Standard defines electrical signal requirements, data transmission protocol
and timing, and specific sentence formats for a 4800-baud serial data bus. Each
bus shall have only a single TALKER but may have multiple LISTENERs.
Silva is a member of NMEA (National Marine Electronic Association), which with
over 350 members represents the most considerable part of the whole marine
electronics industry.
Full information on NEXUS NMEA is available in Appendix C: NEXUS NMEA
0183 Input/Output.
Full information on NMEA 0183 Standard is available in Appendix E: NMEA 0183
Standard for Interfacing Marine Electronic Devices. Not available from Silva.
The units within the NEXUS Network that can send and receive NMEA
Sentences are Server Unit, GPS Antenna (send only). GPS Navigator and Multi
Center.
21.1 NMEA Input
The NMEA input to the NEXUS system can be i.e. an external GPS receiver used
to get position, course and speed over ground etc.
Always connect both NMEA input and NMEA input return. If your NMEA GPS only
has got one NMEA output, connect the NMEA input return to ground at your NMEA
GPS.
Note! Only one NMEA Instrument can be connected to the NMEA Input.
Note! Using NMEA transducers for wind and compass are not recommended as
the update rate is slow compared to the very fast Nexus data bus.
NEXUS general circuit for
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