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The following is an example of an NMEA sentence.
where Table 6.42 outlines the response format:
Refer to NMEA 0183 Standard for Interfacing Marine Electronic Navigational
Devices for more details on sentence format protocols.
The Ashtech proprietary NMEA style response message format applies to the AIM,
LTN, POS, RRE, SAT, and TTT messages, where the format is:
replacing the standard header with an Ashtech proprietary header and adding Ashtech
proprietary message information.
Table 6.43 lists the NMEA data message commands. Only the set command for each
NMEA message type is listed, as the description for the set, query and response
message to each NMEA message are grouped together.
Disable NMEA
Messages
Latency Information
Differential Information $PASHS,NME,MSG
Output Rate Parameter
Photogrammetry
Command/Response Formats
$GPGLL,4728.3100,N,12254.2500,W*FF
Table 6.42: GLL Structure
Field
$
Start of sentence
GPGLL
GP = GPS, GLL = latitude/longitude message
type
4728.3100
Latitude 47°28. 3 1'
N
Latitude direction (north)
12254.2500
Longitude 122°54 . 25'
W
Longitude direction (west)
*FF
checksum
$PASHR,str,<data items>*cc
Table 6.43: NMEA Data Message Commands
Command
$PASHS,NME,ALL
$PASHS,NME,LTN
$PASHS,NME,TCM
$PASHS,NME,PER
$PASHS,NME,TTT
Description
Description
Disable all messages
Enable/disable the latency message
Enable/disable base station message
Enable/disable RTCM rover status
Set send interval of NMEA response message
Enable/disable photogrammetry message
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