parse serial data 2 bytes at a time

[lowski]

I'm acquiring 8 bytes of serial data and I would like to parse the data into 2 bytes of data so that I end up with 4 different temperature measurements. I tried many things that I found within the forum but I can't get it to work. The VI I attached is using the scan from string function but I'm not very familiar with this function. My defaulted my serial data so that you can see the data I'm receiving.

Thanks in advance for your help

Lowski

[billko]

Do you know what the format of the data is supposed to be?

[lowski]

Yes the processor is spitting out data in binary (8 bytes) my output data will be displayed in decimal value

[altenbach]

Looks like 8 bytes of binary data. Try unflatten to an U16 (or I16) array and index the four elements.

Do you need to apply some scaling?

Is it little or big endian?

What range of temperatures do you expect from the default data in the current string indicator?

[lowski]

I'll give that a try...

Yes I do have to apply some scaling, it lil Endian, and I'm expecting to read temperatures upto 210C

[lowski]

Sorry I meant BIG Endian

[altenbach · Accepted solution]

See if this gets you started. You need to figure out the scaling yourself.

[lowski]

Thanks for your help altenbach! Yes this is exactly what I need...However I've applied my scale factors and I noticed that the I get the correct readings (~24-26C) for all three measurements but then I get really odd readings which tells me that I'm not synced at all. You probably noticed which I should of mentioned in the beginning, there is are 2 bytes of data at the end of the string (0xBEEF) that was added to use as a sync so that I know whats the next 2 bytes and so on are. How can I do this in LV.

Thanks again for your help!

lowski

[altenbach]

Sorry, I don't do serial,....

You probably need to slow down the loop and query the number of bytes at port before reading. At what rate are the string arriving? Maybe you should just buffer the data and parse whenever your end of string marker is detected. I am sure somebody can give you more precise advice.

[lowski]

Thanks for the help! I think buffering my data and then parsing it is the way to go, I'll see what I can do

lowski