Programming Error

[wlaflamme]

I am using Excel VBA to communicate with a measuremnet machine via RS232 port. The program works great but every once and a while I receive an Error Code 8021 . I could not find any information on this to resolve this problem. Any ideas?

 

[PeterCharles]

I don't know if this helps?

http://support.microsoft.com/kb/135404/EN-US/