MDEV-GPS-RM datasheet(14/27 Pages) LINX

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220 – Position Fix Interval

This command sets the position fix interval. This is the time between when

the module calculates its position.

Ival = the interval time in milliseconds.

The interval must be larger than 100ms. Faster rates require that the baud

rate be increased, the number of messages that are output be decreased

or both. The module automatically calculates the required data bandwidth

and returns an action failed response (Flg = 2) if the interval is faster than

the module can output all of the required messages at the current baud

rate. The following example sets the interval to 1 second.

$PMTK220,1000*1F<CR><LF>

It is recommended to use interval rates of 100ms, 200ms, 500ms,

1,000ms and 2,000ms. Although permissible, non-standard intervals are

not guaranteed or recommended.

Position Fix Interval Command and Response

Command

Start

Msg ID

Interval

Checksum

End

$PMTK

220

,Ival

*Cksum

Response

Start

Msg ID

CMD

Flag

Checksum

End

$PMTK

001

,220

,Flg

*Cksum

Figure 23: Position Fix Interval Command and Response

251 – Serial Port Baud Rate

This command sets the serial port baud rate.

Rate = serial port baud rate

0 = default setting (9,600bps)

4800

9600

14400

19200

38400

57600

115200

The following example sets the baud rate to 57,600bps.

$PMTK251,57600*2C<CR><LF>

Serial Port Baud Rate Command and Response

Command

Start

Msg ID

Rate

Checksum

End

$PMTK

251

,Rate

*Cksum

Response

Start

Msg ID

CMD

Flag

Checksum

End

$PMTK

001

,251

,Flg

*Cksum

Figure 24: Serial Port Baud Rate Command and Response

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