RI- Signal from DCE to DTE, Modem (DCE) detects ring from line. TD- Transmit data, it carries data from DTE to DCE.ĬD- Carrier Detect, signal from DCE to DTE. For example, DTE is the computer and DCE is the modem connected to the telephone line. RD- Receive data, it receives data from DCE (Data communication Equipment) and pass to DTE (Data Terminal Equipment). The interface is mainly used for one to one serial communication forĮxample computer to dial up modem connection.įigure-1 depicts RS232 pin diagrams for DB9 connector.įigure 2 depicts RS232 pin diagrams for DB25 connector.Īs shown in the figure, it carries both data and control signal lines. The interface is two types DB9 and DB25 pin connectors. Hyper terminal is the application mainly used to check serialĬommunication port of the computer, often referred as COM port. It supports data transfer rate from about 110bps to about 115200 bps RS232 is the interface mainly used for serial data communication.
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