Holux M-89 -, Specification, Page: 13 / 16

M-89
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:info@holux.com.tw http:www.holux.com.tw
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