RS 232 SERIAL COMMUNICATION PROTOCOL PC
For example, a microcontroller can be connected to another microcontroller or to a PC and exchange data using the serial communication protocol. Serial communication (also called RS232 communication) enables a microcontroller to communicate with other devices using the serial RS232 communication protocol. Let us begin by examining the first level of interaction with the transmission medium itself – the physical layer and its specifications.ĭogan Ibrahim, in SD Card Projects Using the PIC Microcontroller, 2010 1.3.10 Serial I/O It is important to understand these layers in order to comprehend the various other protocols. The first layers of the OSI model include functions of the physical, data link, and network layers. The engineering department of the EIA issued the EIA-232 interface standard in the United States in 1969. EIA-232 was particularly developed for interfacing data terminals to modems. The EIA-232 interface standard was developed for interfacing data terminal equipment (DTE) and data circuit terminating equipment (DCE) (earlier called as Data Communication Equipment) employing serial binary data interchange. This book uses the common notation of “RS232.” This standard, developed by the Electronic Industry Association and the Telecommunications Industry Association (EIA/TIA), is more popularly referred to simply as “RS232” where “RS” stands for “recommended standard.” In recent years, this suffix has been replaced with “EIA/TIA” to help identify the source of the standard. EIA/TIA-232-E specification is the most popular serial communications standard. Serial communications is used extensively within the electronics industry due to its relative simplicity and low hardware overhead (as compared to parallel interfacing). Reddy, in Industrial Process Automation Systems, 2015 9.1 RS232 overview In UART, the communication between two devices can be done in two ways namely serial data communication and parallel data communication.B.R. The main function of UART is to serial data communication.
RS 232 SERIAL COMMUNICATION PROTOCOL FULL
The UART full form is "Universal Asynchronous Receiver/Transmitter", and it is an inbuilt IC within a microcontroller but not like a communication protocol (I2C & SPI). For simple switching and control of functions such as lighting, windows, mirror adjustment and instrument displays a low speed (100 KBaud) bus is used.
A high speed (1 MBaud) bus is used for rapid control devices for operations such as engine management and vehicle stability and motion control. Two variants are available to suit different transmission rates. The CAN bus is defined as a two wire, serial communications bus designed for networking intelligent sensors and actuators in a centralised multiplexing system. Suitable for data rates up to 100K bits per second or 10M bits per second depending on the length of the cables. Normally half duplex, it uses a differential balanced line over twisted pair for noise immunity and does not specify or recommend any particular data protocol. Used for data rates up to 20,000 bits per second.ĮIA-485 (formerly RS485) connection - A standard for serial transmission of data between multiple devices with cable lengths up to 4000 feet. Separate transmit and receive lines provide full duplex communication. RS232 connection - A standard for serial transmission of data between two external devices with cable lengths up to 50 feet. It will be a data link used for performance monitoring, for data logging, for diagnostics, or for setting system parameters or it may be a communications channel carrying system control signals.
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