UB-93
GPS Module series
THE PRO NAME IN GPS
HOLUX Technology, Inc.
1F, No.30, R&D Road, Hsinchu 300, Taiwan (Hsinchu Science Industrial Park)
TEL: 886-3-6687000 FAX:886-3-6687111 E-mail:[email protected] http:www.holux.com.tw
11
GLL Geographic
GSA
GNSS DOP and active satellite
GSV
GNSS Satellites in view
RMC
Recommended minimum specific GNSS data
VTG
Course Over Ground and Ground Speed
ZDA
Time & Data
5.3 MTK NMEA Packet Format
Preamble TalkerID PktType Datafield
* CHK1 CHK2 CR LF
Maximum packet length is restricted to 255 bytes
Field Length
Type
D
Preamble 1
byte
Character
“
$
＂
TalkerID
4 byte
Character string
“
PMTK
＂
PktType
3 byte
Character string
“
000
＂
to
“
999
＂
, an identifier
used to tell the decoder how to
decode the packet
DataField Variable
“
,
＂
must be inserted ahead
each data filed to help the decoder
process the Data Field
* 1
byte Character
The star symbol is used to mark
the end of Data Field
CHK1
CHK2
2 byte
Character string
checksum of the data between
Preamble
“
,
＂
and
“
*
＂
CR, LF
2 byte
Binary data
used to identify the end of a
packet
