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The interface can be established up to a distance of 50 feet.

A maximum current of 500mA can be drawn from pins of RS232.

A maximum data transfer speed of 19 Kbps(Kilobits per second) is possible through RS232.

Two pin simplex RS232 interface can also be established easily if required.

Full duplex interface of RS232 is very convenient.

MAX232 IC can be installed easily to establish RS232 interface with microcontrollers.

The logic has wide voltage range giving convenience for user.

Logic ‘1’ on pin is stated by voltage of range ‘-15V to -3V’ and Logic ‘0’ on pin is stated by voltage of range ‘+3V to +15V’.

RS232 uses Asynchronous communication so no clock is shared between PC and MODEM.

Ground (Used as reference for all pin voltage pulses) Set by MODEM to tell PC a ringing condition has been detected. Request To Send(Set by PC to tell MODEM that MODEM can begin sending data)Ĭlear To send(Set by MODEM to tell PC that it is ready to receive data) Transmit Data (Data is transmitted through this pin)ĬONTROL pins (These pins are for establishing interface and to avoid data loss)Ĭarrier Detect(Set by MODEM when answer is received by remote MODEM )ĭata Terminal Ready(Set by PC to prepare MODEM to be connected to telephone circuit)ĭata Set Ready(Set by MODEM to tell PC it is ready to receive and send data) Receive Data (Data is received though this pin) These nine pins are roughly divided in to three categories and we will discuss each category below.ĭATA pins (Data flow takes through these pins)

The DCE and DTE ports are exactly similar except for the direction of data flow. These nine pins are arranged in the port as shown in RS232 Connector Pinout. New RS232 has nine pins as mentioned earlier. RS232 used to have 25 pin, now it is shrunk to just 9 pin. Although RS232 is later replaced by faster USB (Universal Serial Bus) it is still popular in some areas. RS232 uses serial communication protocol where data exchange is done bit by bit. The need for RS232 came from limitations raised by parallel data exchange. It was designed for data exchange between DTE (Data Terminal Equipment) or PC and DCE (Data Communication Equipment) or MODEM. RS232 connector is a port used for data exchange between equipments.