Maestro A2200-A Manual de usuario descargar pdf (Pagina 16)

V1.0-Mar-14

User’s Manual

Page 16 of 43

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

Example

Description

MID

$PSRF100

PSRF100 Protocol header

Protocol

0 = SiRF OSP

1 = NMEA

Baud

4800

1200, 2400, 4800, 9600, 19200, 38400, 57600, or

115200

DataBits

8 only

StopBits

1 only

Parity

0 = None only

Checksum

*0E

End of message termination

Table 4: Set Serial Port Data Format

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.

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