no output from string subset

[cantata2014]

20 bytes are read from VISA read:

and I want to take the value 00BF, so I used String Subset, with offset=25, length=4. but there is no output at substring

Does anyone know how to fix this? Thanks!

[Miraz_Automation]

Why 25and4? make it 10 and 2 it should work.

[moderator1983]

The code should work fine.

Try using 'Highlight Execution' and see where the data is going missing.

Edited1: Tell us about, how the string indicator (Read buffer) is configured, is it Normal or Hex.

Edited2: Also include the 'String Length' functionfor debugging purpose.

[cantata2014]

Hi,
Yes that's a problem. When I use String controller as input, the String Subset works fine.
But when using VISA read buffer as input, there is no output

[moderator1983]

I think the problem is in the way the string is configured (check my previous edited reply).

Also, as mentioned already, debug using the String Length function.

[QH_Dai]

think convert to byte array is better.

[GerdW]

Hi QH_Dai,

why should this be better?

- There's no difference in taking an array subset or a string subset…

- The main problems stays: Cantata has to learn how it's data is represented! There's a difference in "normal" and "hex" string display - and so the byte offset and length differs when we want to have a certain subset…

[Miraz_Automation]

Sorry, I thought you are taking HEX string, if that is normal string then 25 and 4 should work. For HEX string 10 and 2 should work.

[cantata2014]

Hi everyone,

I've got another question.

after getting the String subset, I want to convert the hex string to decimal number. I used the Hex String to Number function, but the output is 0. Does anyone know how to do this? Thanks very much!

[GerdW]

Hi Cantata,

you still don't get how your data is presented. You need to convert your string either by

- typecasting that string subset to U16…

- converting that string subset to byte array, indexing the two bytes and JOINing them to U16…