EB-230 Datasheet, PDF (8/16 Pages) List of Unclassifed Manufacturers – Power Schottky Rectifier with common cathode

3.1.2 MTK NMEA Packet Format
EB-230 Data Sheet
Preamble TalkerID PktType DataField * CHK1 CHK2 CR LF
Maximum packet length is restricted to 255 bytes.
Field
Preamble
TalkerID
PktType
DataField
*
CHK1,
CHK2
CR, LF
Length
1 byte
4 byte
3 byte
Variable
1 byte
2 byte
2 byte
Type
Character
Character string
Character string
Character
Character string
Binary data
Description
“$”
“PMTK”
From “000” to “999”, an identifier used
to tell the decoder how to decode the
packet
A “,” must be inserted before each data
filed to help decoder process the
DataField
The star symbol is used to mark the end
of DataField
Checksum of the data between
preamble “,” and “*”
Used to identify the end of a packet
Sample Packet: $PMTK000*32<CR><LF>
3.1.3 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.
3.1.4 MTK NMEA Packet List
Pkt
Type
Abbreviation /
Syntax
000 ^PMTK_TEST
001 ^PMTK_ACK
PMTK001,Cmd,Flag
010 ^PMTK_SYS_MSG
PMTK001,Msg
None
Data
Field
Cmd: Command / packet
type the acknowledge
responds
Flag:
0 = Invalid command /
packet
1 = Unsupported command
/ packet type
2 = Valid command /
packet, but action failed
3 = Valid command /
packet, and action
succeeded
Msg: System message.
0 : Unknown
1: Startup
Meaning /
Example /
Return
Test Packet
$PMTK000*32<CR><LF>
Acknowledge of PMTK command
$PMTK001,604,3*32<CR><LF>
Output system message
$PMTK010,001*2E<CR><LF>
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