This is a standard distributed control system with controller equipment capable of establishing communication between two devices using serial port connections. It is the intermediate component that interconnects HMI/display through microprocessors to working devices such as sensors,switches or electric systems. As it is mostly employed in process control operations,it can provide flexible event tracking,computing,monitoring,alarms,plant control with SCADA and so on. Some of the real-time operations with fieldbus include data acquisition,network management,vending machine and traffic control. It finds applications in medical,oil and gas,energy systems,building,surveillance and satellite communication.