Host Engineering Forum
General Category => Do-more CPUs and Do-more Designer Software => Topic started by: amos on December 10, 2018, 11:22:25 PM
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I have an issue getting the data from a GPS . I'm getting the data but it is not formated proper. When I first connected the domore to the unit I got the data as expected. The firmware on the PLC was 2.0 when it was working proper. I updated the firmware to 2.3 now I get some data but I can't read it. It seems the data string is not a string. I figured it was the GPS unit but when I connect it to the computer using Putty the data is as expected. Has anybody tried to read data from a gps unit transmitting nmea0183? If I had firmware 2.0 I would try uploading to see if that really is the issue.
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Serial or Ethernet? What instructions are you using to read? What has changed in the data? Give us as much detail as possible.
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Connection is serial using streamin. I'm recieving 2 strings one is
$GPRMC,005008,V,5111.555555,N,09777.555555,W,000.02,185.3,280499,6.7,E,N*2F
$GPVTG,230.6,T,,,000.04,N,000.07,K,A*44
This is what is received using Putty "The location are not real"
On the Domore I recieve
$GPM0656V500.55053N0956.5509000.63.60996.N9.
$GPVG3.6000.6N000.30KA0.
The PLC seems to read the data OK just not displaying proper. I'm not sure what's hapening here.
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This is a description of the actual sentence.
RMC Sentence
(Recommended Minimum Specific GPS Data)
The RMC sentence identifies the UTC time, status, latitude,
longitude, speed over ground (SOG), date, and magnetic variation of
the position fix. The sentence structure is shown below:
$GPRMC,184804.00,A,3723.476543,N,12202.2397
45,W,000.0,0.0,051196,15.6,E*7C
Table D-13 describes the RMC sentence fields.
Table D-13 RMC Sentence Fields
Field Description
1 Time: UTC time of the position fix in hhmmss.ss format
2 Status
A: Valid
V: Navigation Receiver Warning (V is output whenever
the receiver suspects something is wrong)
3 Latitude coordinate (the number of decimal places, 0?7, is
programmable and determined by the numeric precision
selected in TSIP Talker for a RMC sentence)
4 Latitude direction: N = North, S = South
5 Longitude coordinate (the number of decimal places, 0?7,
is programmable and determined by the numeric precision
selected in TSIP Talker for a RMC sentence)
6 Longitude direction
W: West
E: East
7 Speed Over Ground (SOG) in knots (0?3 decimal places)
8 Track Made Good, True, in degrees
9 Date in dd/mm/yy format
10 Magnetic Variation in degrees
D-18 AgGPS 124/132 Operation Manual
NMEA-0183 Sentences D
11 Direction of magnetic variation
E: Easterly variation from True course (subtracts from
True course)
W: Westerly variation from True course (adds to True
course)
12 Mode Indication
A: Autonomous
D: Differential
N: Data not valid
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Ok forget the posts I think I got it working.
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Ok forget the posts I think I got it working.
Awesome! We're always here to help though.