Nmea; Telegrams; Standard Nmea 0183 Communication Parameters; External Interfaces - Simrad ES70 - INSTALLATION REV A Installation Manual

NMEA

The National Marine Electronics Association (NMEA) has defined communication
standards for maritime electronic equipment, and the ES70 echo sounder conforms to
these standards. The most common standard is NMEA 0183, and the National Marine
Electronics Association describes it as follows:
The NMEA 0183 Interface Standard defines electrical signal requirements, data
transmission protocol and time, and specific sentence formats for a 4800 baud serial
data bus. Each bus may have only one talker but many listeners.
For more information about the National Marine Electronics Association and the NMEA
0183 standard, refer to the organization's web site at:
http:\\www.nmea.org

Telegrams

To move information between two electronic units, the data are collected in
The content (protocol) of each telegram is defined by the NMEA standard, and several
telegram types exist to allow different type of data to be distributed.
The phrase
datagram
Unless you wish to write your own software, you do not need to know how these
telegrams are designed. However, whenever you set up equipment interfaces, you need
to ensure that each system on your communication line is set up to send and receive the
same telegram. The standard allows one system to send data (a "talker") and several
others to receive data simultaneously ("listeners") on the same line. Therefore, you must
ensure that all products receiving data on a communication line is set up to receive the
same telegram(s) that the transmitting product provides.

Standard NMEA 0183 communication parameters

The communication parameters defined for NMEA 0183are:
• : 4800 bits per second
Baudrate
• : 8
Data bits
• : None
Parity
• : One
Stop bits
Some instruments will also offer other parameters and/or choices.

External interfaces

The following interfaces are set up to transmit and/or receive information by means
of Ethernet and/or serial lines.
343522/A
— National Marine Electronics Association
is also frequently used about this communication method.
Interfaces and integration
telegrams
.
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