142 G12 OEM Board & Sensor Reference Manual
Any combination of these messages can be output through different ports at the
same time. The output rate can be set to any value between 0.05 and 999 seconds.
The default output interval is one second.
Standard NMEA messages have the following structure:
HEADER,DATA*CHECKSUM<CR><LF>
The comma after the header is followed by the ASCII data string and the message
checksum. The checksum is separated from the data string by an asterisk. Both
standard and non-standard NMEA messages use a dollar sign ($) to indicate the
beginning of a message, and both types are terminated with a <CR><LF> delimiter.
GGA, which is a standard NMEA message:
$GPGGA,DATA*CHECKSUM<CR><LF>
The structure of non-standard NMEA messages:
HEADER,MESSAGE ID,DATA*CHECKSUM<CR><LF>
Standard NMEA messages include the message identifier in the header. Non-
standard messages, which have an Ashtech proprietary format, have the message
identifier in a separate field. SAT, a non-standard message:
$PASHR,SAT,DATA*CHECKSUM<CR><LF>
The data types that appear in NMEA messages can be integers, real numbers
(decimal), hexadecimal numbers, alphabetic characters, and alphanumeric
character strings.
Data items are separated by commas; successive commas indicate data not available. Two
successive commas indicate one missing data item; three successive commas indicate two
missing items.
Refer to the NMEA 0183 Standard for Interfacing Marine Electronic Navigational Devices for more
details on protocols and message formats.
NME: Enable/Disable All NMEA Messages
$PASHS,NME,ALL,x,OFF
Disable ALL NMEA message types on port x, where x is the output port.
Example
Enter the following command to disable all NMEA messages for Port A.
$PASHS,NME,ALL,A,OFF <Enter>
Enter the following command to disable all NMEA messages for Port B.
$PASHS,NME,ALL,B,OFF <Enter>
You must enter both of the above commands to disable the output of all messages from both ports.
G12RevD.book Page 142 Tuesday, April 2, 2002 4:33 PM
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