Neoway G2 Series - Data Format Protocol

G2 & G7A
Commands Manual
Copyright © Neoway Technology Co., Ltd
2
2 Data Format Protocol
NMEA messages are transmitted by GNSS receivers and comply with the NMEA0183 protocol.
Table 2-1 Data format
$
<address>
{ , < data > }
*<checksum>
<CR><LF>
Start sign
Address field
Data fields
Checksum field
Sequential
message
identifier field
Each
sentence
starts with a
"$" sign.
Two parts: Talker
identifier and
sentence format
Start with a
",", followed
by data of
fixed length
and variable
length
The 8-bit exclusive OR (no
start or stop bits) of all
characters in the sentence,
including "," and "^"
delimiters, between but not
including the "$" and the "*"
delimiters.
The hexadecimal value of
the most significant and least
significant 4 bits of the result
is converted to two ASCII
characters (0-9, A-F (upper
case)) for transmission.
Each sentence
ends with the
termination
delimiter
<CR><LF>
For detailed NMEA protocol, visit http://www.nmea.org/.
This Commands Manual adds custom sentences based on NMEA data format protocol to control the
work mode and query the product information of the GNSS receivers. The identifier of custom
sentences is 'P'.