This standard is used for transmission of information exchange over the telephone lines. RS232 describes the common voltage levels, electrical standards, operation mode and number of bits to be transferred from DTE to DCE. In this case, DTE sends binary data “11011101” to DCE and DCE sends binary data “11010101” to the DTE device. The DTE (computer) transmits the information serially to the other end equipment DCE (modem).
Formally, it is specified as the interface between DTE equipment and DCE equipment using serial binary data exchange. Example of DTE device is a computer and DCE is a modem. Here, DTE refers to Data Terminal Equipment and DCE refers to the Data Communication Equipment. It defines the serial communication using DTE and DCE signals. In RS232, ‘RS’ stands for Recommended Standard.
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