48 G12 OEM Board & Sensor Reference Manual
G12 serial port commands fall into four groups:
• Receiver commands
• Raw data commands
• NMEA message commands
• RTCM differential commands
The following sections discuss each type of command. Within each section, the
commands are listed alphabetically and described in detail. A description of the
command, the command structure, the range and default states of command
parameters, and an example of how a given command is used are presented for
each command. These parameters may be either characters or numbers
depending upon the command. Table 4.1 lists the symbols and the types of data
represented by them used to illustrate message structures in the ASCII format:
Table 4.1. Command Parameter Symbols
Symbol Parameter Type Example
c 1 character ASCII N
d Numeric integer 3
f Numeric real 2.45
h Hexadecimal digit FD2C
m Mixed parameter (integer and real) for lat/lon or time 3729.12345
s Character string
*hh Hexadecimal checksum; always preceded by an asterisk (*) *A5
G12RevD.book Page 48 Tuesday, April 2, 2002 4:33 PM
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