String data to boolean data

[velkumar10]

Hi I am using my PIC Microcontroller for controlling 4 Motors. I have programmed my PIC. Meanwhile I have interfaced PIC with LabVIEW using VISA. Am going to read the data from PIC. I am passing 1 byte binary data from PIC to LabVIEW. The Problem is when I am getting the data in string. I want the string data to be converted into Boolean value.  For example: Am passing 0100 data, 4 individual bits correspond to the 4 motor status. So When I pass this value, in my labVIEW the boolean indicator motor 2 should be glow. Help me with this guys. Thanks in advance 

[GerdW]

Hi velkumar,

convert the string to an array of U8 values, index the first byte from the array, convert this U8 value to a boolean array.

3 simple functions: StringToU8Array, IndexArray, NumberToBooleanArray…

[velkumar10]

Thank you , I attached my VI. When i run this, only motor 1 boolean indicator glows. For all value.

[GerdW]

Hi velkumar,

I cannot open your LV2015 VI right now, so I attach a snippet containing just the 3 functions mentioned above:

Seems easy to implement…

[velkumar10]

Thanks. But When I run this... String value gets accumlated ie the previous value gets accumaled with the new value. As I am continously sending the string data from my PIC to labview. Is there is any way for seperating new string from the old one.

[GerdW]

Hi velkumar,

as I said before: I cannot open your VI because of the LabVEIW version you use.

Is there is any way for seperating new string from the old one.

Simple solution: When you want to get the data of the new string you should work with this new string - don't attach it to the old data…

[velkumar10]

Hi GerdW,

 Thanks for your reply, I have attached snippet of my program. I cant get you what you are trying to say

[GerdW]

Hi velkumar,

- you always read the latest data: I have no idea why you think you accumulate your string data

- you use DeleteFromArray to get the last byte of the string: no idea why you do this

- using BytesAtPort is most often the wrong function to use. Either you use the TermChar or, like in your case, you read a fixed amount of data…

What's the data rate you want to receive? What's the message size you receive? What's the message format?

[crossrulz]

Duplicate thread: http://forums.ni.com/t5/Instrument-Control-GPIB-Serial/String-data-to-indicate-ON-OFF-of-motor/m-p/3...