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3.3 Serial Port Settings
In UART operation (defined by the external pull-up resistor as outlined in Minimum
Configuration) the default settings are:
• NMEA, 9600 baud, 8 data bits, no parity, 1 stop bit, no flow control
3.3.1 Change Serial Port setting
This command message is used to set the protocol (SiRF OSP or NMEA) and/or the
communication parameters (Baud rate, data bits, stop bits, and parity). The com-
mand is used to switch the module back to SiRF OSP 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, after a reset, the receiver re-
sumes using the saved parameters.
Table 4 contains the input values for the following example:
Switch to Serial Port Band rate at 4800
Example: $PSRF100,1,4800,8,1,0*0E <CR><LF>
Name
MID
Protocol
Baud
DataBits
StopBits
Parity
Checksum
<CR><LF> -
3.4 Improved TTFF
In order to improve the TTFF (Time To First Fix), it is recommended to keep Vcc
supplied or backup battery at V_BAK at all times so that Navigation data and initial
condition (timing and approximate location) are kept current. To reduce power
consumption, customers can take advantage of the many sophisticated low power
mode features available in the SiRFstarV chipset.
V1.0-Mar-14
Example
$PSRF100
1
4800
8
1
0
*0E
Table 4: Set Serial Port Data Format
Description
PSRF100 Protocol header
0 = SiRF OSP
1 = NMEA
1200, 2400, 4800, 9600, 19200, 38400, 57600, or
115200
8 only
1 only
0 = None only
-
End of message termination
User's Manual
Page 16 of 43
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