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100 – SetSerialPort
This command message is used to set the protocol (SiRF binary or NMEA)
and/or the communication parameters (baud rate). Generally, this command is
used to switch the module back to SiRF binary protocol mode where a more
extensive command message set is available. When a valid message is
received, the parameters are stored in battery-backed SRAM and the receiver
restarts using the saved parameters.
The table below contains the values for the following example:
Switch to SiRF binary protocol at 9600, 8 ,N,1
101 – NavigationInitialization
This command was used to initialize the receiver with the current position (in X,
Y, Z coordinates), clock offset, and time, enabling a faster fix. Increased receiver
sensitivity and the removal of Selective Availability (SA) have made this
unneccessary. The command is retained for its ability to reset the module, but
the initialization fields are no longer supported.
The table below contains the values for the following example:
$PSRF101,0,0,0,96000,0,0,12,4*1F
$PSRF100,0,9600, 8 ,1,0*0C
Name
Example
Units
Description
Name
Example
Description
Message ID
$PSRF101
PSRF101 protocol header
Message ID $PSRF100
PSRF100 protocol header
ECEF X
0
Protocol
Baud
DataBits
StopBits
Parity
0
9600
8
1
0
0=SiRF binary, 1=NMEA
4 8 00, 9600, 19200, 38 400, 57600
8 1
1 1
0=None 1
ECEF Y
ECEF Z
ClkOffset
TimeOfWeek
WeekNo
0
0
96000
0
0
Checksum
*0C
ChannelCount 12
<CR><LF>
End of message termination
ResetCfg
4
See Table 15
Table 1 3 : SetSerialPort Example 2
1. SiRF protocol is only valid for 8 data bits, 1 stop bit, and no parity.
Checksum
<CR><LF>
*1F
End of message termination
2. Default settings are NMEA protocol using 9,600 baud, 8 data bits, 1 stop bit, and no parity.
For details on the SiRF binary protocol, please refer to SiRF’s Binary Protocol
Reference Manual.
Table 14: NavigationInitialization Example
Hex
0x01
0x02
0x04
0x0 8
Description
Hot Start – All data valid
Warm Start – Ephemeris cleared
Cold Start – Clears all data in memory
Clear Memory – Clears all data in memory and resets the receiver back
to factory defaults
Table 15: ResetCfg Values
Page 16
Page 17
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