DB9 Pinout diagram for RS-232 communication or Serial Port of Computer,Picture show is describe the function of each wire in a cable and pin position.
DB9 pinout for Serial Port or RS-232 system.
CD = Data Carrier Detect
RxD = Receive Data
TXD = Transmit Data
DTR = Data Terminal Ready
GND = Ground Signal
DSR = Data Set Ready
RTS = Request To Send
CTS = Clear To Send
RI = Ring Indicator
Picture below show in detail.
RS232 Cables and Wiring Diagram for DB9
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