How can i write a sign string in VISA Write?

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.

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.

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