Accton Technology AC-IG2004W manual Serial Port to 9-Pin COM Port on PC, Null Modem

Cables

Serial Port to 9-Pin COM Port on PC

Gateway’s 9-Pin Serial Port		CCITT Signal		PC’s 9-Pin COM Port
1 DCD	-----------	DCD	------------	1
2 RXD	<---------	TXD	------------	3
3 TXD	-----------	RXD	---------->	2
4 DTR	-----------	DSR	---------->	6
5 SGND	-----------	SGND	----------	5
6 DSR	-----------	DTR	------------	4
7 RTS	-----------	CTS	----------->	8
8 CTS	<---------	RTS -------------		7
9 RI	-----------	RI ---------------		9

Serial Port to 25-Pin DCE Port on Modem

Gateway’s 9-Pin Serial Port		CCITT Signal		Modem’s 25-Pin DCE
				Port
1	<---------	DCD	------------	8
2	<---------	RXD	------------	3
3	-----------	TXD	---------->	2
4	-----------	DTR	---------->	20
5	-----------	SGND	----------	7
6	<---------	DSR	------------	6
7	-----------	RTS	----------->	4
8	<---------	CTS -------------		5
9	<---------	RI ---------------		22

Serial Port to 25-Pin DTE Port on PC

Gateway’s 9-Pin Serial Port	Null Modem		PC’s 25-Pin DTE Port
1 DCD	1	1	8 DCD
2 RXD	2	3	3 TXD
3 TXD	3	2	2 RXD
4 DTR	4	8	20 DTR
5 SGND	5	20	7 SGND
6 DSR	6	7	6 DSR
7 RTS	7	4	4 RTS
8 CTS	9	5	5 CTS
9 RI	20	6	22 RI

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