3Com 7000 manual Signal, Meaning, pin Male, pin Female

120APPENDIX D: CABLING REQUIREMENTS

Table 31 Serial Port Pinout and Their Functions

Pin	Signal	Meaning
1	RTS	Request to Send
2	TxD	Transmit Data
3	RxD	Receive Data
4	DSR	Data Set Ready
5	GND	Ground
6	DTR	Data Terminal Ready
7	CTS	Clear to Send
8	RTS	Request to Send
9	NC	Not Connected
Shell		Protective Ground

Table 32 correlates the cable pinouts between the CoreBuilder 7000 and a 9-pin and 25-pin PC-AT serial interface. Unspecified pins are unused.

Table 32 Cable Pinouts To a 9-Pin and 25-Pin Serial Interfaces

CoreBuilder 7000
Serial Port		To PC-AT Serial Port		To PC-AT Serial Port
9-pin Male		9-pin Female		25-pin Female
Screen	Shell	Shell	Only req. if	Shell	Only req. if
			screen		screen
TxD	2	2	RxD	3	RxD
RxD	3	3	TxD	2	TxD
GND	5	5	GND	7	GND
RTS	1
CTS	7	7	RTS	4	RTS
RTS	8	8	STS	5	CTS
DSR	4	4	DTR	20	DTR
DTR	6	6	DSR	6	DSR

Table 33 correlates cable pinouts between the CoreBuilder 7000 and a modem interface.