3Com CoreBuilder 7000 Installation & Start?Up Manual page 120

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EQUIREMENTS
Table 31 Serial Port Pinout and Their Functions
Pin Signal
1 RTS
2 TxD
3 RxD
4 DSR
5 GND
6 DTR
7 CTS
8 RTS
9 NC
Shell
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
9-pin Male
Screen Shell
TxD 2
RxD 3
GND 5
RTS 1
CTS 7
RTS 8
DSR 4
DTR 6
Table 33 correlates cable pinouts between the CoreBuilder 7000 and a
modem interface.
Meaning
Request to Send
Transmit Data
Receive Data
Data Set Ready
Ground
Data Terminal Ready
Clear to Send
Request to Send
Not Connected
Protective Ground
To PC-AT Serial Port
9-pin Female
Shell Only req. if
screen
2 RxD
3 TxD
5 GND
7 RTS
8 STS
4 DTR
6 DSR
To PC-AT Serial Port
25-pin Female
Shell Only req. if
screen
3 RxD
2 TxD
7 GND
4 RTS
5 CTS
20 DTR
6 DSR