checksum calculation

Hi everyone in the Forum,

I have an instrument used to measure some concentartion of gas which emits a series message that looks like this

2007-03-12 11:37:14 MDT,0x00000001,NH3,0.46,0.00,ppmm,21%,5.0,11,0,0,0

or

2007-03-12 11:37:22 MDT,0x00000001,NH3,0.41,0.00,ppmm,21%,5.0,11,0,0,0

I analyze some of these characters, convert it to numbers and plotthem in real time. For example, 21% is the signal strength I draw in real time using labview. Now some time the instrumnet does not export the whole string completely and maybe missing half of the line. I want to run a sensitive position on the string checksum to check that it is complete and correct and not to dismiss this line. I tried to use CRC16 but each time it gives me a 4 digits and characters such as e.g. F415 or was only numbers for example 7014, I DO NOT KNOW HOW TO INTERPRET THESE CHARACTERS. Grateful if someone can give me a hint or tell me how to use the checkum (or only one) to reject the imcomplete channels.

A CRC is only useful for checking that a transmission has been successful.  It works as a parity.  It must be added to the message from the sender and then verified by the receiver.  So in short, the CRC will not help you here.  It seems that data are separated by commas.  Maybe you can count how many commas are in the message to verify that you have all the settings message.

Tags: NI Software

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