Siemens 2614 manual DB-9 Port Pin Assignments, Serial Port to 9-Pin COM Port on Computer

DB-9 Port Pin Assignments

EIA	CCITT	Description	Gateway’s	Computer	Modem	Signal
Circuit	Signal		DB9 DTE	DB9 DTE	DB25 DCE	Direction
			Pin #	Pin #	Pin #	DTE-DCE
CF	109	DCD (Data Carrier	1	1	8	<------
		Detected)
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	<------

Table B-4. DB-9 Port Pin Assignment

Serial Port to 9-Pin COM Port on Computer

	SpeedStream 2614’s	CCITT Signal			Computer’s
	9-Pin Serial Port				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
	Table B-5. Serial Port to 9-Pin COM Port on Computer
Serial Port to 25-Pin DCE Port on Modem
	SpeedStream 2614’s	CCITT Signal			Modem’s
	9-Pin Serial Port				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

Table B-6. Serial Port to 25-Pin DCE Port on Modem

B-3