Jonnie 5 gave you the best advice regarding solving your problem -
post your code. I just wanted to add that when you say "Labview
standard program", it doesn't mean an awful lot. There are several
shipping examples of serial communication and they are different
depending on which versioon of LabVIEW that you're using. Real old
ones used the serpdrv and more recent ones use VISA. I don't remember
any of the examples being setup to add a termination character to the
write string. This is one of the most common mistakes people make when
starting to program serial in LabVIEW.
