Tragant NL-504ETTL Handleiding

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MTK NMEA Packet User Manual

Revision: 0.3

Linked FW Version: 1.902_06

Release Date: 2006/05/02

MediaTek Inc.

MTK NMEA Packet Format

Preamble TalkerID PktType DataField * CHK1 CHK2 CR LF

Packet Length:

The maximum length of each packet is restricted to bytes 255

Packet Contents:

Preamble: One byte character.

‘ $’

TalkderID: Four bytes character string.

“PMTK”

PktType: Three bytes character string.

From “” to “” 000 999

An identifier used to tell the decoder how to decode the packet

DataField: The DataField has variable length depending on the packet type.

A comma symbol ‘’ must be inserted ahead each data filed to help the decoder ,

process the DataField.

*: 1 byte character. The star symbol is used to mark the end of DataField.

CHK1, CHK2: Two bytes character string.

CHK1 and CHK2 are the checksum of the data between Preamble and ‘*’.

CR, LF: Two bytes binary data.

The two bytes are used to identify the end of a packet.

Sample Packet:

$PMTK000*32<CR><LF>

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© 2007 Navilock Europe

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© 2007 Navilock Europe

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