MDEV-GPS-RM datasheet(17/27 Pages) LINX

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Set Datum

This configures the current datum that is used.

Datum = the datum number to be used.

Reference datums are data sets that describe the shape of the Earth

based on a reference point. There are many regional datums based on a

convenient local reference point. Different datums use different reference

points, so a map used with the receiver output must be based on the same

datum. WGS84 is the default world referencing datum.

The module supports 223 different datums. These are listed in Appendix A.

The following example sets the datum to WGS84.

$PMTK330,0*2E<CR><LF>

The following example reads the current datum and the module replies with

datum 0, which is WGS84.

$PMTK430*35<CR><LF>

$PMTK530,0*28<CR><LF>

Set Datum Command and Response

Write Message

Start

Msg ID

Datum

Checksum

End

$PMTK

330

,Datum

*Cksum

Acknowledge Response Message

Start

Msg ID

CMD

Flag

Checksum

End

$PMTK

001

,330

,Flg

*Cksum

Read Message

Start

Msg ID

Checksum

End

$PMTK

430

*35

Response Message

Start

Msg ID

Datum

Checksum

End

$PMTK

530

,Datum

*Cksum

Figure 31: Set Datum Command and Response

Static Navigation Threshold

This configures the speed threshold to trigger static navigation. If the

measured speed is below the threshold then the module holds the current

position and sets the speed to zero.

Static navigation is disabled by default, and is set for walking speed.

Thold = speed threshold, from 0 to 2.0m/s. 0 = disabled.

The following example sets the threshold to 1.2m/s.

$PMTK386,1.2*3E<CR><LF>

The following example reads the static navigation threshold and the module

responds with 1.2m/s

$PMTK447*35<CR><LF>

$PMTK527,1.20*03<CR><LF>

The static navigation threshold configuration returns to the default values

after a reset or restart.

Static Navigation Threshold Command and Response

Write Message

Start

Msg ID

Thold

Checksum

End

$PMTK

386

,Thold

*Cksum

Acknowledge Response Message

Start

Msg ID

CMD

Flag

Checksum

End

$PMTK

001

,386

,Flg

*Cksum

Read Message

Start

Msg ID

Checksum

End

$PMTK

447

*35

Response Message

Start

Msg ID

Thold

Checksum

End

$PMTK

527

,Thold

*Cksum

Figure 32: Static Navigation Threshold Command and Response

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