Linx Technologies RXM-GPS-SR - Manual (Page 8)

Page 15 Page 14
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
$PSRF100,0,9600,8,1,0*0C
1. SiRF protocol is only valid for 8 data bits, 1 stop bit, and no parity.
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.
Name Example Description
Message ID $PSRF100 PSRF100 protocol header
Protocol 0 0=SiRF binary, 1=NMEA
Baud 9600 4800, 9600, 19200, 38400, 57600
DataBits 8 8 1
StopBits 1 1 1
Parity 0 0=None 1
Checksum *0C
<CR><LF> End of message termination
Table 12: SetSerialPort Example 2
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
Name Example Units Description
Message ID $PSRF101 PSRF101 protocol header
ECEF X 0
ECEF Y 0
ECEF Z 0
ClkOffset 96000
TimeOfWeek 0
WeekNo 0
ChannelCount 12
ResetCfg 4 See Table 15
Checksum *1F
<CR><LF> End of message termination
Hex Description
0x01 Hot Start – All data valid
0x02 Warm Start – Ephemeris cleared
0x04 Cold Start – Clears all data in memory
0x08
Clear Memory – Clears all data in memory and resets the receiver back
to factory defaults
Table 13: NavigationInitialization Example
Table 14: ResetCfg Values