Microchip Technology GPS-2700, User Manual

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SCPI-Control Quick Start Instructions
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2020 Microchip Technology Inc. DS50003016A-page 41
3.3.26 GPS:SURV:VAR <mm^2>
This command specifies the minimum variance of the average position computed
during the Survey. This minimum value is used as a threshold under which the GNSS
receiver can stop the Survey. The GNSS receiver will stop the Survey when the minimal
duration has been reached and the variance of the average position is under the spec-
ified minimum variance.
3.3.27 GPS:HOLD:POS <cm, cm, cm>
This command allows the user to specify manually the exact position of the antenna.
This command will overwrite the Hold position in NV memory. Subsequent Survey will
overwrite also the Hold position. The Hold position is stored in ECEF coordinates.
3.3.28 GPS:SURV:STAT?
This query displays the current status of the survey. The status of the survey is in one
of the 3 states:
ACTIVE: A survey is in progress.
VALID: A survey has been achieved successfully and the GNSS receiver is now
using this Hold position as reference.
INVALID: No survey are in progress or have been achieved since the last power
cycle.
When in ACTIVE or VALID state, this query will also display the duration, the Hold posi-
tion in ECEF coordinates and the position variance.
3.3.29 GPS:INIT:DATE <yyyy,mm,dd>
Firmware revision 0.57 and later adds support for manually setting the time and date
in the RTC in the event that no GNSS signals are available. This command allows set-
ting the internal RTC DATE manually when operating the unit in GPS denied environ-
ments. This command is compatible to the PTIME:OUT ON command described in
Section 3.5.5 to allow automatic time and date synchronization of two units to each
other. The internal RTC is driven by the highly stable CSAC 10
MHz signal, and thus
has very high accuracy.
3.3.30 GPS:INIT:TIME <hour,min,sec>
Firmware revision 0.57 and later adds support for manually setting the time and date
in the RTC in the event that no GNSS signals are available. This command allows set-
ting the internal RTC TIME manually when operating the unit in GPS denied environ-
ments. This command is compatible to the PTIME:OUT ON command described in
Section 3.5.5 to allow automatic time and date synchronization of two units to each
other. The internal RTC is driven by the highly stable CSAC 10
MHz signal, and thus
has very high accuracy.
3.3.31 GPS:SYST:SEL [GPS | SBAS | QZSS | GAL | BD | GLO]
GPS-2700 with firmware revision 0.74 and later and uBlox 8 GNSS receiver is capable
of simultaneously receiving up to three concurrent GNSS systems at one time. Firm-
ware revision 0.74 and later also supports the GPS-2700 with uBlox 6 GPS receiver.
This command selects the GNSS systems that are enabled in the GNSS receiver and
are used to generate the timing and positioning information for the NMEA data, and to
generate the 1PPS reference for the GNSSDO. The command is followed by a list of
the shortened names of the GNSS systems to enable. The shortened names of sup-
ported GNSS system include GPS, SBAS, QZSS, BD (BeiDou), GAL (Galileo) and
GLO (GLONASS). Please see Section 2.4.3 for restrictions on the concurrent GNSS