ASCII Into Something That Makes Sense

afish · Mar 19, 2010

Hi All,
I am tring to read GPS data into a SLC 5/03 via RS232.
I am getting the data into a string but I am having trouble converting into somthing that makes sense.
This what I am getting in my string:
\80\F8\F8\80\80\E0\E0\80\80\80\F8\80\80\E0\80\80\E0\80\80\80\80\F8\80\80\80\80\80\E0\80\F8\80\80\F8\80\80\80\80\80\E0\F8\E0\80\80\80\80\E0\80\E0\80\80\80\80\E0\80\E0\80\E0\80\80\F8\80\80\80\80\E0\80\80\F8\F8\80\80\E0\80\E0\80\E0\E0\F8\80\E0\80\FE
I have tried the "ACI" instruction (String to Integer), but there is text in the data that I need, so an integer will not work.
I can get the data with HyperTerminal & it seems to work just fine. It automatically converts it into somthing I can make sense of.
This it what I see in HyperTerminal:
$GPRMC,171855,A,4407.9810,N,12310.6126,W,000.0,7,160310,017.1,E*68
How can I convert the string data into something I can use?
Any help is appreciated, thanks in adavance.

Ken Roach · Mar 20, 2010

First, you need useful data in the SLC. The bytes you cited look like the RS-232 port is set for a different baud rate or different number of data bits.

Check carefully your working values for serial framing (number of data bits, number of stop bits, parity, baud rate) in Hyperterminal and make sure the SLC has the same.

Parsing strings in the SLC operating system isn't nearly as easy as doing so in ControlLogix, but it's do-able. I did an interface from an EarthMate GPS five years ago just like what you're doing but don't have access to the project files any longer.

afish · Mar 20, 2010

Thanks for the reply Ken.

I cant believe I overlooked that, but baud rate was probably the problem.

I was setting the baud rate in the "system tab" for channel 0 instead of the "user tab".
I will have to wait until Monday before I can test.

Thanks again Ken.

ASCII Into Something That Makes Sense

afish

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Ken Roach

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afish

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