34 G12 OEM Board & Sensor Reference Manual
Both NMEA messages and Magellan’s NMEA-style messages begin with a dollar
sign ($) and end with a Carriage Return/Line Feed <CR><LF> delimiter.
Any combination of these messages can be output through either serial port at the
same time, and you can even choose to send the same message can be output
through both ports. The output rate is determined by the $PASHS,NME,PER
command, and can be set to any value between 0.05 and 999 seconds depending
upon the update rate option installed (20, 10, 5, 2 or 1 Hz). For more information
refer to the “NMEA Commands” section on page 139.
The output rate can be set to any value between 0.05 and 999 seconds. The
default setting for the output interval is one second. See Chapter 4, Command/
Response Formats, for more information on NMEA messages and Ashtech’s
NMEA-style messages.
Raw Data Output (Optional)
The G12 has an optional feature that allows you to output raw data (also called
real-time data) through serial ports A and B. Five different messages can be
output:
• MBN: Contains measurement data for each locked satellite using the
Ashtech type 2 data structure.
• PBN: Contains position and velocity data.
• SNV: Contains satellite ephemeris data.
• SAL: Contains satellite almanac data in a proprietary format.
• MCA: Contains measurement data (same as MBN) for each locked
satellite using the Ashtech type 3 data structure
All raw data messages are in binary format. The transmission protocol remains
the same: 8 data bits, 1 stop bit, and no parity bit. Any combination of messages
can be output through any of the serial ports, and the same messages can be
output through different ports at the same time. The output interval is determined
by the $PASHS,RCI command, and can be set to any rate between 0.05 and 999
seconds depending upon which option has been selected for the raw
measurement update rate (20, 10, 5, 2, or 1 Hz). For more information on the
DEFAULT SETTINGS
Output interval setting for NMEA messages and Ashtech NMEA-style
messages is one second.
G12RevD.book Page 34 Tuesday, April 2, 2002 4:33 PM
To Next Page
Loading...