Data Sheet

GPS Module
L80 GPS Protocol Specification
L80_GPS_Protocol_Specification Confidential / Released 20 / 41
3.6. Packet Type: 103 PMTK_CMD_COLD_START
This message is used to cold start the GPS module. Using this message will force the GPS cold restarted
without using any prior location information, including time, position, almanacs and ephemeris data.
Example:
$PMTK103*30<CR><LF>
Field
Description
$
Each NMEA message starts with ‘$’
PMTK
MTK proprietary message
Packet type
103
*
End character of data field
Checksum
Hexadecimal checksum
<CR><LF>
Each of message
3.7. Packet Type: 104 PMTK_CMD_FULL_COLD_START
This message is essentially a cold restart, but additionally clear system and user configurations at re-start.
That is, reset the GPS module to the factory status. Full cold start means the GPS module has no
information on last location. It needs to search the full time and frequency space, and also all possible
satellite numbers before it can get a fix.
Example:
$PMTK104*37<CR><LF>
Field
Description
$
Each NMEA message starts with ‘$’
PMTK
MTK proprietary message
Packet type
104
*
End character of data field
Checksum
Hexadecimal checksum
Quectel
Confidential