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The G12 command structure has been kept as close as possible to that of Sensor
II, while allowing for the increased capabilities of the G12.
Most $PASHS commands are the same for both receivers, but there are
differences. For example, the Sensor II can support RTCM and Ashtech
differential modes, while the G12 supports RTCM only. Further, because G12 has
many new features, there are a significant number of new $PASHS commands.
$PASHR response messages are different in most cases. This is due to the
presence of additional features and operational parameter settings in the G12. For
example, the Sensor II can only be set as a remote station, while the G12 can be
set as a base or remote station, so the response to the query command
$PASHQ,RTC (query RTCM operating parameters and status) is different.
Responses for the $PASHQ,PAR, $PASHQ,RAW, and $PASHQ,RID query
commands are also different for the G12.
Raw data output formats are the same for the Sensor II and the G12, but the G12
can output additional raw messages not available for Sensor II: CT1, CT2, CT3,
MCA, and MCM. NMEA message output formats for both receivers are in
compliance with NMEA 2.0 standards, but the resolution in certain fields of some
messages is different.
G12RevD.book Page 201 Tuesday, April 2, 2002 4:33 PM
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