SMC Networks 48-Port manual DB-9 Port Pin Assignments, Console Port to 9-Pin COM Port on PC

CABLES

DB-9 Port Pin Assignments

EIA	CCITT	Description	Switch’s	PC DB9	Modem	Signal
Circuit	Signal		DB9 DTE	DTE	DB25	Direction
			Pin #	Pin #	DCE Pin #	DTE-DCE
CF	109	DCD (Data Carrier Detected)	1	1	8	<------
BB	104	RxD (Received Data)	2	2	3	<------
BA	103	TxD (Transmitted Data)	3	3	2	------>
CD	108.2	DTR (Data Terminal Ready)	4	4	20	------>
AB	102	SG (Signal Ground)	5	5	7	-------
CC	107	DSR (Data Set Ready)	6	6	6	<------
CA	105	RTS (Request-to-Send)	7	7	4	------>
CB	106	CTS (Clear-to-Send)	8	8	5	<------
CE	125	RI (Ring Indicator)	9	9	22	<------

Console Port to 9-Pin COM Port on PC

Switch’s 9-Pin			CCITT Signal		PC’s 9-Pin
	Serial Port				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

Console Port to 25-Pin DCE Port on Modem

Switch’s 9-Pin		CCITT Signal		Modem’s 25-Pin
Serial Port				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

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