The software is based on OPC DA specification (OLE For Proc essControl Data Access) development of OPC client software, anddifferent from other OPC clients, expansion of a lot of otherfunctions. For example, to support the Visual Basic script, so thetraditional OPC server can support WEB access, add black and whitelist, put forward to obtain data from OPC server to the built-inModbus server or stored in the database.