How can i write a sign string in VISA Write?

[Piccoli]

Hello everybody.

I would like someone to help me. I have an array, which is transformed (by Byte Array to String) in a string that reaches the VISA Write Serial Port. My problem is that when making the transformation with Byte Array to String, i  lose all the bytes with sign (negative).
What can I do? I don't want to  lose the sign bytes and be able to send them to VISA Write Serial Port.

Thank you very much.

[RavensFan]

It sounds like you have a typecasting problem.  First, why do some of your bytes have a sign?  I assume they are I8.  Strings are based on U8 because they are just a series of ASCII characters vs. values.  The ASCII character table goes from 0 to 255.

What happens on the other end of the VISA communication string?

One thing you could do is to typecast your bytes to a U8.  Though I think the coercion dot of an I8 byte array going into the byte array to string is doing this automatically.

[Guillem_A]

Hi,


This was already answered in another post with the same title in spanish.You can find it here:

http://forums.ni.com/ni/board/message?board.id=6170&message.id=7257&query.id=21551#M7257

In short and going beyond of the meaning of a negative byte, you can do it with the one of the functions in the Palette of String/to Number Conversion.

Best.