An OPC sever (OLE for Process Control) provides IO and more devices to communicate with a wide range of HMI/SCADA software packages residing on a host. Advantech's OPC server for ADAM and modbus devices features OPC DA (data access) and AE(alarm and events) client for the rapid testing of data connections, supporting Advantech's modbus devices, such as MODBUS/RTU and MODBUS/TCP. Any software system with OPC client capabilities such as OPC DA and AE sever can access the Advantech OPC server drivers.