Multiple value request from a device

[cbutcher]

Here's a 2015 version. No large downloads needed 🙂

[Vindecua]

I already try your VI but it's not work. 😞

[cbutcher]

Urgh 😕 Sorry...

Do you know where the problem is? Perhaps you can use probes to check the values returned by the Read, the Bytes at Port, and the string subset? I'm not sure where I went wrong and I can't check without hardware 😞

[Vindecua]

I check by probe now but i still don't know where is the problem. 😞

[Vindecua]

I just see that my VI at the first result from PV's reading return 0 byte that maybe that cause why PV is 0 all the time but your VI ,PV's reading return 7 bytes but the result of SV and PV are 0. 😞

[cbutcher · Accepted solution]

Ok - so it looks like some part of my processing is broken, but the reads might be ok.

First thought realised while typing - change the 4s to 3s and try again. Perhaps I miscounted the positioning...

Since you previously managed to get valid results using String to Byte Array, I would suggest trying again with that and your index array function, but be aware that the data should be bytes 4 and 5, not just 4. (or maybe 3 and 4, not just 3) You can drag the index array down to get two outputs and use Join Number or something similarly named to get a U16 number.

Edit, checked the document you linked again. Pretty sure I messed up indexing. Change the 4 to 3 and it hopefully will work.

[Vindecua]

i finally done it!!!!

i change how to get output and it's work.

thanks for your help.

ps. i have to use this to do my graduate project and you save me lot. 🙂