Simrad ITI Instrukcja Użytkownika Pobierz pdf (Strona 19)

Instruction manual

857-164777 / A

6 NMEA 0183 MESSAGES, DEFINITIONS

Messages transmitted and received on serial lines or Ethernet are

all based on the NMEA 0183 data format protocol.

The main characteristics are as follows:

• RS-422A asynchronous serial line

• 4800 baud

• 8 data bits

• No parity

• One or more stop bits

• All data coded in ASCII code

• Optional ”X-OR” checksum

All messages start with either; “$” or “@”.

Telegram s starting with “$” do fully comply with the NMEA 0183

data format protocol.

• All other telegrams are in accordance with an old proprietary

“Simrad standard.” They start with @, but otherwise they

follow the main characteristics listed below.

• The next two letters (Talker identifier) indicate which system

is transmitting the messages. Simrad ITI System uses II as a

talker identifier.

• Thenextthree lettersindicate thetype ofmessage. Thetelegram

may consist of many data fields separated by commas. A field

may be empty, and then only the separating commas are

transmitted, also called nullfields.

• Each message ends with <cr> (Carriage Return)and <lf> (Line

Feed). For all message starting with ”$” the checksum *hh is

included in c ompliance wit h version 2.20 of the NMEA 0183

standard, - no checksum on ”@” sentences.

Throughout this docume nt, all telegrams with II as the Talker

identifier, and telegrams with the proprietary code PSIM,are

originated by ITI and transmitted to other equipment. All

telegrams with other Talker identifiers are received by ITI from

external equipment.

Message description

Below you will find the message description for ITI t opside

software version 5.30 or above. The different t ypes of telegrams

are not listed in consecutive order.

Note The *hh check sum, <cr> c arriage return and <lf> line feed are

not described for each sentence.

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 35 36

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Simrad ITI Instrukcja Użytkownika Strona 19