Most generally this error indicates an improper use of one of the RS-232 library functions, in that a parameter was passed to it that is not capable of being used internally to the function. However, in your case, since you didn't provide much indication as to what function call is producing the error it is very hard to tell what is giong on.
I'm afraid everyone will need far more information about the problem in order to figure out why it is happening in your case. For example, do you know what function call is generating this error? If so provide a code snippet with the exact parameter listings (i.e. declarations and all) so that we can see if you are calling the function correctly. Also provide information about the OS you are running on and a general context of
your dll and application. Now, if you are not the developer of this dll and do not have the source code, things will become difficult for debugging this, and it would probably be best just to have the developer take a look at it.
Jason F.
Applications Engineer
National Instruments
www.ni.com/ask
