Hi Mario Ku,
a search in the Instrument Driver Network only returned a driver for LabVIEW communicating over the GPIB.
Nevertheless, according to the Programmers Manual (which can be downloaded here) your instrument can be programmed over the serial port with a simple message protocol. I have used this protocol with some Fluke DMMs finding it easy to use. The manual includes also a small BASIC sample program which can be easily ported to CVI and can serve you as a framework to develop your own set of commands for your instrument.
I suggest you to connect initially to the instrument with a simple 3-wire cable without hardware handshaking, which is easy to realize and easier to control in program, switching to a more complex connnection with hardware handshaking in a second time and only in case you absolutely need it.
