sdf to txt RS 232 DK spectrometer Labview SM642 Filter Wheel EX AD131 SM304 Source 1/2m SM301EX SM445 SM400 300 CM112 GPIB sdf DK240 spectrometer. SM32Pro VC# AD111 USB Visual Basic 1/8m SMProMX SM301 AD SM monochroamtor DK480 AB300 SM301-EX DK242 1/4m Mono CM110 Python 32bit convert NI PCI 111 SM200 SM32ProForSM301 CM SM32Pro Executable Visual C++ SDK SM303 SM245 Demo monochromator 131 Detector AB