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Draw pin diagram of DB9 connector, stating function of each pin.
1 Answer
written 5.6 years ago by | • modified 5.6 years ago |
Pin No | Name | Dir | Description |
---|---|---|---|
1 | DCD | IN | Data Carrier Detect. Raised by DCE when modem synchronized. |
2 | RD | IN | Receive Data (a.k.aRxD, Rx). Arriving data from DCE. |
3 | TD | OUT | Transmit Data (a.k.aTxD, Tx). Sending data from DTE. |
4 | DTR | OUT | Data Terminal Ready. Raised by DTE when powered on. In autoanswer mode raised only when RI arrives from DCE. |
5 | SGND | - | Ground |
6 | DSR | IN | Data Set Ready. Raised by DCE to indicate ready. |
7 | RTS | OUT | Request To Send. Raised by DTE when it wishes to send. Expects CTS from DCE. |
8 | CTS | IN | Clear To Send. Raised by DCE in response to RTS from DTE. |
9 | RI | IN | Ring Indicator. Set when incoming ring detected - used for autoanswer application. DTE raised DTR to answer. |