ashtech GG Surveyor, Reference Manual

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22 GG Surveyor GPS+GLONASS Reference Manual
Serial Port Configuration
The GG Surveyor provides RS-232 serial ports with two-way full-duplex
communication. The default transmit/receive protocol is 9600 baud, eight data bits,
no parity, and one stop bit (8N1). The baud rate of the GG Surveyor ports is
adjustable using the $PASHS,SPD speed set command; the data bit, stop bit, and
parity protocol is always 8N1.
On initial power-up or after use of the $PASHS,INI (memory reset) command, or the
$PASHS,RST (reset to defaults) command, the GG Surveyor defaults to 9600 baud
for all RS-232 serial ports.
The baud rates between the GG Surveyor and the interfacing equipment must be the same for the
port and the device connected to the port.
To resume communication with the GG Surveyor after changing the baud rate using
the $PASHS,SPD set command, change the baud rate of the command device.
Parameter Settings and Status
Receiver parameters are changed by using one of the set commands found in Chapter
6, Command/Response Formats. Most parameters are not saved through a power
cycle unless saved using the SAVE command ($PASHS,SAV,Y). If the parameters
have been saved, the default parameters can be retrieved using either the
$PASHS,SAV,N command and a power cycle, the $PASHS,RST command, or the
$PASHS,INI command. See Chapter 6, Command/Response Formats for more
information.
The current settings of receiver parameters can be viewed using the query commands.
Many individual parameters have a unique query that can be used to check their
status. However, there are 4 main query command that can be used to check multiple
parameters at one time. Each of these query commands relates to a particular area:
• $PASHQ,PAR - queries general receiver parameters
• $PASHQ,RAW - queries raw data parameters
• $PASHQ,RTC - queries RTCM differential parameters
• $PASHQ,CPD - queries carrier phase differential parameters
The response to each of these queries is in free form format.