![]() ![]() 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. In the most simple case you may connect 3 pins only.RS232 connector is a port used for data exchange between equipments. If you don't need the flow control then you may not connect corresponding pins. ![]() Way but sends the stop signal out the CTS pin. When the computer is ready to receive some bytes it sets RTS to HIGH (+12V) and the flow of bytes to it resumes.įlow control signals are always sent in a direction opposite to the flow ![]() The low state of the RTS (Request To Send) signal equal to -12V means "Do not send to me" (stop sending). Then when a DTE (such as a computer) wants to stop the data sending into it, it sets To get RTS/CTS flow control to work you need to select a corresponding option in the Advanced Serial Serial Port Monitor supports both RTS/CTS and DTR/DSR flow controls.īoth flow control modes work the same way. We have already described it in the FlowĬontrol chapter but the pins and voltage signals were not. If devices RTS and CTS or DTR and DSR pins are coonnected then it means that the "hardware" flow control can be used. ![]() Note: DCD can be sometimes labeled as CD Hardware flow control: RTS/CTS and DTR/DSR ![]()
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