MDEV-GPS-RM datasheet(13/27 Pages) LINX

13 / 27 page

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The write and read messages are shown in Figure 21. A write message

triggers an acknowledgement from the module. A read message triggers a

response message containing the requested information.

The module responds to commands with response messages. The

acknowledge message is formatted as shown in Figure 22.

Figure 21: Input Write and Read Messages

Input Write and Read Messages

Description

Write ID

Read ID

Response ID

Set NMEA Output Messages

314

414

514

Set Datum

330

430

530

Static Navigation Threshold

386

447

527

Enable Ephemeris Prediction

869

Acknowledge Message

Name

Example

Description

Start Sequence

$PMTK

Message ID

001

Acknowledge Identifier

Command

CMD

The command that triggered the acknowledge

Flag

Flg

Flag indicating the outcome of the command

0 = Invalid Command

1 = Unsupported Command

2 = Valid command, but action failed

3 = Valid command and action succeeded

Checksum

CKSUM

CKSUM is a two-hex character checksum as

defined in the NMEA specification, NMEA-0183

Standard for Interfacing Marine Electronic Devices.

Checksums are required on all input messages.

End Sequence

Each message must be terminated using Carriage

Return (CR) Line Feed (LF) (\r\n, 0x0D0A) to cause

the receiver to process the input message. They

are not printable ASCII characters, so are omitted

from the examples.

Figure 22: Acknowledge Message

101 – Hot Re-start

This command instructs the module to conduct a hot re-start using all of

the data stored in memory. Periodic mode and static navigation settings are

returned to default when this command is executed.

$PMTK101*32<CR><LF>

102 – Warm Re-start

This command instructs the module to conduct a warm re-start that does

not use the saved ephemeris data. Periodic mode and static navigation

settings are returned to default when this command is executed.

$PMTK102*31<CR><LF>

103 – Cold Re-start

This command instructs the module to conduct a cold re-start that does

not use any of the data from memory. Periodic mode and static navigation

settings are returned to default when this command is executed.

$PMTK103*30<CR><LF>

104 – Restore Default Configuration

This command instructs the module to conduct a cold re-start and return

all configurations to the factory default settings.

$PMTK104*37<CR><LF>

161 – Standby Mode

This command instructs the module to enter a low power standby mode.

Any activity on the RX line wakes the module. Only enter standby mode

after the module acquires a position fix.

$PMTK161,0*28<CR><LF>

The module outputs the startup message when it wakes up.

$PMTK010,001*2E<CR><LF>

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