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So, if you set different baud rates, then the receiver might miss out some bits which the transmitter is sending (because it is configured to receive data and process it with a different speed!). This is because, when you set a baud rate, you telling the microcontroller to transmit/receive the data at that particular rate. The receiver might receive the junk data. It is the unit of symbol rate, also known as baud or modulation rate. However, though technically incorrect, in the case of modem manufacturers baud commonly refers to bits per second.įor two microcontrollers to communicate serially they should have the same baud rate, else serial communication won’t work properly. Baud Rate: According to Wikipedia, baud is synonymous to symbols per second or pulses per second.Full Duplex Communication: full-duplex communication means that data can be transmitted from the master to the slave, and from slave to the master at the same time!.either from master to slave, or slave to master, but not both. Half Duplex Communication: this means that data transmission can occur in only one direction at a time, i.e.Simplex Communication: In this mode of serial communication, data can only be transferred from transmitter to receiver and not vice versa.

MSB/LSB: This stands for Most Significant Bit/Least Significant Bit. Since data is transferred bit-by-bit in serial communication, one needs to know which bit is sent out first: MSB or LSB.

There are many terminologies or ‘keywords’ associated with serial communication.

Now it’s time to learn about some new words. Asynchronous: Transfer a single byte at a time.Synchronous: Transfer block of data (characters) at a time.There are two methods of Serial Communication.

It will send one byte at a time (8-bits).Serial communication Parallel communication.Types of communicationīasically, there are two types of communication But what does communication between two microcontrollers mean? It is simple! An exchange of data (bits)! There are many protocols for communication (which would be discussed later) but all of them are based on either serial communication or parallel communication. Data can be anything and in any form – they could be written/spoken words, in form of media like audio/video. Serial Communication Basics Tutorial Introduction What is mean by communication?Įxchanging the data between two systems is termed as communication. You can also read the PIC16F877A USART tutorial, RF module interfacing with LPC2148, 8051 UART tutorial, RTOS Basics, and LPC2148 Serial communication.