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Draw pin diagram of DB9 connector, stating function of each pin.

written 6.9 years ago by teamques10 ★ 70k

•   modified 5.6 years ago

embedded systems

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written 6.9 years ago by teamques10 ★ 70k

•   modified 6.9 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.

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