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RS232 interface cable pinout | RS232 EIA standard DB25 & DB9 Pin out signals

Information courtesy Telebyte Inc. and Stayonline

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Pin	Signal	Pin	Signal
RS-232 DB-9 Interface Pin-out
1	Data Carrier Detect	6	Data Set Ready
2	Received Data	7	Request to Send
3	Transmitted Data	8	Clear to Send
4	Data Terminal Ready	9	Ring Indicator
5	Signal Ground

RS-232 (EIA Std.) applicable to the 25 pin interconnection of Data Terminal Equipment (DTE) and Data Communications Equipment (DCE) using serial binary data.
Pin	Signal	EIA CKT	From DCE	To DCE
1	Frame Ground	AA
2	Transmitted Data	BA		D (Data)
3	Received Data	BB	D
4	Request to Send	CA		C (Control)
5	Clear to Send	CB	C
6	Data Set Ready	CC	C
7	Signal Gnd/Common Return	AB
8	Rcvd. Line Signal Detector	CF	C
11	Undefined
12	Secondary Rcvd. Line Sig. Detector	SCF	C
13	Secondary Clear to Send	SCB	C
14	Secondary Transmitted Data	SBA		D
15	Transmitter Sig. Element Timing	DB	T (Timing)
16	Secondary Received Data	SBB	D
17	Receiver Sig. Element Timing	DD	T
18	Undefined
19	Secondary Request to Send	SCA		C
20	Data Terminal Ready	CD		C
21	Sig. Quality Detector	CG		C
22	Ring Indicator	CE	C
23	Data Sig. Rate Selector (DCE)	CI		C
24	Transmitter Sig. Element Timing	DA		T
25	Undefined

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