Source and destination are both active and can send and receive data simultaneously. Such a communication network consists of variety of devices. Serial Communication In 8051 Full Duplex mode is the worlds most widely used form of serial communication. . The most commonly used serial communication method is based on the RS232 standard. Simplex communication means that data will be transmitted only in one direction while half-duplex means data will be transmitted in both directions but at one time only one device can transmit whereas full-duplex means data may be transmitted in both directions at one time while one device is. Asynchronous serial data communication is widely used for character-oriented transmissions. There are three types of transmission mode. Serial communication may be simplex half-duplex or full-duplex. It occurs when we speak to others. Serial communication is a simple means of sending d...