136
NMEA Sentence Output
The NMEA-0183 is output in text format with each item separated by a comma (,) and sentences
separated by a new line code (CRLF). The checksum is added up at the line end. The checksum
calculates the XOR’ed value of character data enclosed by $ , ' and * in hexadecimal string values.
Table 2.102
$ Sentence-identifying
character ,
value (, value)…
*Checksum
CRLF
Multiple sentence types are defined.
Some data containing broken sentences may be read depending on when the GPS is opened and
read. NMEA sentence data can be properly interpreted use programming procedures such as those
listed below.
•
Detect head of sentence using $ character.
•
Detect end of sentence using line break (CRLF) code.
•
Discard broken sentences verified with checksum.
Summary of Contents for IT-800 Series
Page 173: ...173 Copyrights Tab This tab is for displaying the OS copyright information Figure 3 19 ...
Page 201: ...201 Date Tab This tab is for setting display format of date Figure 3 56 ...
Page 247: ...247 4 2 Games The terminal comes with two games Solitaire and Bubble Breaker Figure 4 2 ...
Page 255: ...255 4 5 Calculator The application can be used to operate nine digit calculator Figure 4 11 ...