The Expansion and Implementation of RS-232 Interface on the I/O Resource Layer in VISA I/O Library

For the VISA I/O libraries developed in the domestic only support few kinds of interfaces,this paper proposes creating a list to manage all kinds of resources in the VISA.With this method,you can add one or more kinds of interfaces' driver into the VISA I/O library,which only support one or few kinds of interfaces before.By expanding the VISA I/O library's resource management layer and I/O resource layer,the newly developed VISA I/O library can support GPIB and RS-232 interfaces.This paper showed the critical minds of creating and maintaining the list by several functions in the VISA I/O library and showed the application routines of this VISA I/O library in Visual C++ 6.0.