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System 6844(RC) - V03.00
hopf
Elektronik GmbH
Nottebohmstr. 41
• D-58511 Lüdenscheid • Tel.: +49 (0)2351 9386-86 • Fax: +49 (0)2351 9386-93 • Internet: http://www.hopf.com • E-Mail: [email protected]
6.3.10 NMEA 0183 - GPRMC (V3.00)
The full NMEA format
1
0183 GPRMC contains the position-, rate- and time data (UTC) calcu-
lated by the GPS receiver. The different information are separated in the data string by a
comma. If a system information is not available (e.g. by the Sub-Master (Slave) System) only
a comma is set as separator.
Data String Format by:
The below transmitted data string contains only the time information in UTC and only by
GPS systems additionally the position in the following format:
GPS System
$GPRMC,hhmmss.ss,A,WWWW.WWWW,w,LLLL.LLLL,l,,,DDMMYY,,,a*CC<CR><LF>
Sub-Master (Slave) Systems
$GPRMC,hhmmss.ss,A,,,,,,,DDMMYY,,,a*CC<CR><LF>
The information for the speed, direction and magnetic direction (compass) are
not present.
All information are transmitted between the ASCII characters
"$"
and
"*"
, followed by two
characters for the checksum (EXOR calculated characters between
“$"
and
"*"
). The hexa-
decimal values of the upper and lower 4 bits of the checksum are transferred into ASCII
characters. The binary values
A-F
are
transferred to the ASCII characters
"A"
-
"F"
(41h -
46h).
All information are transmitted as ASCII characters with 8 bit word length, 1 stop bit and no
parity.
The structure of string contains the following information:
Information
Format
Description
Time Source
"GP"
Time Source=
GP
S
String Identifier
"RMC"
R
ecommended
M
inimum Sentence
C
Time
hhmmss.ss
Hours, Minutes, Seconds & Milliseconds
Status
(Character # 18)
A
"A"
= synchronous: Status of the clock is "R" or "r"
"V"
= not synchronous: Status of the clock "-" or "C"
Position Width
(GPS systems only)
WWWW.WWWW
Degree & Minute Decimal Point
and Fractional Digits
Position Width
(GPS systems only)
w
Hemisphere:
"N"
=North,
"S"
=South
Position Length
(GPS systems only)
LLLL.LLLL
Degree & Minute Decimal Point
and Fractional Digits
Position Length
(GPS systems only)
l
Direction:
"E"
=East,
"W"
=West
Mode Indicator
(Character # 56)
a
"A"
= synchronous: Status of the clock is "R" or "r"
"N"
= not synchronous: Status of the clock is "-" or "C"
Checksum
CC
The checksum is calculated from the XOR function
between
"$"
and
"*"
of all transmitted ASCII charac-
ters. All information are transmitted as ASCII charac-
ters.
1
NMEA = National Marine Electronics Association
