Read Serial Data

[ritesh024]

Dear All, I am reading data from serial port which the VISA read function stores in a string buffer. is dere any way by which i can store the data in a string array as i want to access the data in bytes separately?? Thanks Ritesh

[drewsky]

You can acess each character seperately if you wire the string into a for loop and enable indexing.

[cschneider]

Hi drewsky!This solution was new for me, so I tried to wire a string into a for-loop, but I can't enable indexing (top of image). Can you specify what you mean? Do you mean a solution as showed on the bottom of the image??<img src="Loading Image..."> Greetings,ChristianMessage Edited by cschneider on 08-09-2008 04:40 PM


string1.png:
http://forums.ni.com/attachments/ni/170/348045/1/string1.png

[drewsky]

Yeah that's what I meant.&nbsp; I don't have LV on this comp, so I didn't try it ahead of time. :smileysad: Will that work for you?

[MKES]

Is this what want to do ?


String to array.vi:
http://forums.ni.com/attachments/ni/170/348097/1/String to array.vi

[ShotSimon]

ritesh024,
&nbsp;
You can enable indexing into and out of&nbsp;a FOR LOOP by right clicking on the input/output box at the boundary of the FOR LOOP.&nbsp; In your case&nbsp;in the top FOR LOOP the pink incoming box.&nbsp; Regards,&nbsp; -SS

[drewsky]

that's what I thought too, but I just tried it, and it won't allow it.&nbsp; The software I am using right now is beta, so I could be wrong...&nbsp; I'll double check at the office tomorrow...

[ShotSimon]

LabVIEW 64-bit beta?&nbsp; -SS

[drewsky]

yeah

[ritesh024]

Thanks alot guys for your help. That for loop solution works gr8.and one more thing .. you cant do auto indexing for a string in for loop. you can only do it for an array.. so, u need to break the string into substrings for storing a string into array ..Ritesh

[ShotSimon]

ritesh024,
That is very interesting since a string in C programming is a one-dimensional array of type char, with a \0 termination?&nbsp; I never noticed that LabVIEW is different in this regard.
Thanks for pointing that out with such a simple example:smileyvery-happy:&nbsp;-SS

[MKES]

Hi !
&nbsp;
Here you have another one using less code than my previous post... it's added to that one for you to compare.
&nbsp;
:robotwink:


String to array1.vi:
http://forums.ni.com/attachments/ni/170/348280/1/String to array1.vi

[drewsky]

I don't know if it matters, but looking at the VI MKES posted, I did a quick performance test.&nbsp; As expected the String subset appears to be slightly faster, but of course to see that requires a long string and a lot of iterations.&nbsp; Food for thought if you have a ton of strings to process this way.