User Manual

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E T E K N A V I G A T I O N , I N C .

PROFESSI O N AL IN NAV I GATION & CO M M U NI C ATIO N

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

Packet Length:

The maximum length of each packet is restricted to 255 bytes

Packet Contents:

Preamble: One byte character.

‘$’

TalkderID: Four bytes character string.

“PMTK”

PktType: Three bytes character string.

From “000” to “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>

Summary of content (9 pages)

PAGE 1
ETEK NAVIGATION,INC. P R O F E S S I O N A L I N N AV I G ATI O N & C O M M U N I C ATI O N 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 255 bytes Packet Contents: Preamble: One byte character. ‘$’ TalkderID: Four bytes character string. “PMTK” PktType: Three bytes character string.
PAGE 2
ETEK NAVIGATION,INC. P R O F E S S I O N A L I N N AV I G ATI O N & C O M M U N I C ATI O N MTK NMEA Packet Protocol: In order to inform the sender whether the receiver has received the packet, an acknowledge packet PMTK_ACK should return after the receiver receives a packet. MTK NMEA Packet List: Packet Type: 000 PMTK_TEST ..................................................................................... 3 Packet Type: 001 PMTK_ACK ....................................................................
PAGE 3
ETEK NAVIGATION,INC. P R O F E S S I O N A L I N N AV I G ATI O N & C O M M U N I C ATI O N Packet Type: 000 PMTK_TEST Packet Meaning: Test Packet. DataField: None Example: $PMTK000*32 Packet Type: 001 PMTK_ACK Packet Meaning: Acknowledge Packet DataField: PktType: The packet type the acknowledge responds. Flag: ‘0’ = Invalid packet.
PAGE 4
ETEK NAVIGATION,INC. P R O F E S S I O N A L I N N AV I G ATI O N & C O M M U N I C ATI O N None Example: $PMTK101*32 Packet Type: 102 PMTK_CMD_WARM_START Packet Meaning: Warm Restart: Don't use Ephemeris at re-start. DataField: None Example: $PMTK102*31 Packet Type: 103 PMTK_CMD_COLD_START Packet Meaning: Cold Restart: Don't use Time, Position, Almanacs and Ephemeris data at re-start.
PAGE 5
ETEK NAVIGATION,INC. P R O F E S S I O N A L I N N AV I G ATI O N & C O M M U N I C ATI O N ‘0’: No DGPS source ‘1’: RTCM ‘2’: WAAS Example: $PMTK301,1*2D Packet Type: 313 PMTK_API_SET_SBAS_ENABLED Packet Meaning: API_Set_Sbas_Enabled Enable to search a SBAS satellite or not. DataField: Enabled: Enable or disable ‘0’ = Disable ‘1’ = Enable Example: $PMTK313,1*2E Packet Type: 314 PMTK_API_SET_NMEA_OUTPUT Packet Meaning: API_Set_NMEA_Out Set NMEA sentence output frequencies.
PAGE 6
ETEK NAVIGATION,INC.
PAGE 7
ETEK NAVIGATION,INC. P R O F E S S I O N A L I N N AV I G ATI O N & C O M M U N I C ATI O N $PMTK401*37 Packet Type: 413 PMTK_API_Q_SBAS_ENABLED Packet Meaning: API_Query_Sbas_Enabled DataField: None Return: PMTK_DT_SBAS_ENABLED Example: $PMTK413*34 Packet Type: 414 PMTK_API_Q_NMEA_OUTPUT Packet Meaning: API_Query_NMEA_Out Query current NMEA sentence output frequencies.
PAGE 8
ETEK NAVIGATION,INC. P R O F E S S I O N A L I N N AV I G ATI O N & C O M M U N I C ATI O N DGPS Data Source Mode DataField: Mode: DGPS data source mode ‘0’: No DGPS source ‘1’: RTCM ‘2’: WAAS Example: $PMTK501,1*2B Packet Type: 513 PMTK_DT_SBAS_ENABLED Packet Meaning: Enable to search a SBAS satellite or not.
PAGE 9
ETEK NAVIGATION,INC. P R O F E S S I O N A L I N N AV I G ATI O N & C O M M U N I C ATI O N Mode: 0: PWR_SAV_OFF: power saving mode off 1: PWR_SAV_ON: power saving mode on Example: $PMTK520,0*24 Packet Type: 604 PMTK_Q_VERSION Packet Meaning: Query the version information of FW DataField: NONE Return: PMTK_DT_VERSION Example: $PMTK604*6D Packet Type: 704 PMTK_DT_VERSION Packet Meaning: Version information of FW.