Trimble Outdoors aggps 332 Benutzerhandbuch

C          NMEA-0183 Messages

8 0     AgGPS 332 GPS Receiver User Guide

Newer Trimble receivers conform to the 

NMEA-0183

 Version 2.1 format, 

in which checksums are mandatory for all messages. 

The checksum is calculated from all characters in the message, 
including commas but excluding the “$” and “*” delimiters. The 
hexadecimal result is converted to two 

ASCII

 characters (0–9, A–F), of 

which the most significant appears first.

The data values output by Trimble AgGPS receivers meet the 

NMEA-0183

 Version 2.1 standard.

If a message contains a fixed number of fields, null (empty) fields are 
included if no data is available. These fields are usually reserved for 
data that is transmitted on a periodic or irregular basis.

Talker ID code identifies the source of the data ( for example, 

GPS

, 

Loran C, or Sounder). Table C.2 describes the Talker ID codes that are 
available for 

NMEA-0183

 output from most Trimble receivers. 

GP

GPS

LG

Loran C/ GPS

LC

Loran C

II

Integrated Instrumentation