General specification for all our ActiveX Control- Support Windows 2000/Windows XP/Windows Vista which must have the VB6 runtime environment - Support most development environment which supports ActiveX or OLE design (Visual Basic/Visual C++/C#/VB.NET/VBA/C++ Builder/Delphi and so on) - Support to read and write Bit, Word, Long, Float, Double, Ascii char string, Wide char string. - Simple API interface for different protocol. - Able to create up to 16 protocols in one process. - Free manuals and sample. Feature for this product- Support MELSEC A Series CPUs - Runtime free Limitation- The trial version of Mitsubishi Electric Corporation MELSEC A Series ActiveX Control is a fully functional version, but it has a limitation of only can be run half an hour after connect. If you want to run with no limitation, please Order a register copy from www.plccontrolsoftware.com.