3Com NETBuilder II, Installing Instruction, Page: 33 / 82

Installing the 8-Slot Chassis 2-5
Figure 2-4 9-pin to 25-pin Terminal Cable (Null Modem-Type)
Figure 2-5 9-pin to 25-pin Modem Cable (Straight-Through-Type)
2 Connect one end of the cable to the CONSOLE port on the front panel of the
main processor module. Connect the other end to the serial port on the back of
your device.
1 2 3 4 5 6 7 8 9 10 11 12 13
14 15 16 17 18 19 20 21 22 23 24 25
5 4 3 2 1
9 8 7 6
Name Name Abbr Abbr Pin Pin
25-pin male or female connector
9-pin female connector
2
3
1
8
7
5
4
6
2
3
4
5
8
7
6
20
TxD
RxD
RTS
CTS
CD
GND
DSR
DTR
RxD
TxD
CD
CTS
RTS
GND
DTR
DSR
Transmit Data
Receive Data
Request to Send
Clear to Send
Carrier Detect
Signal Ground
Data Set Ready
Data Terminal Ready
Receive Data
Transmit Data
Carrier Detect
Clear to Send
Request to Send
Signal Ground
Data Terminal Ready
Data Set Ready
To CONSOLE port
To terminal
1 2 3 4 5 6 7 8 9 10 11 12 13
14 15 16 17 18 19 20 21 22 23 24 25
5 4 3 2 1
9 8 7 6
25-pin male connector
9-pin female connector
To CONSOLE port
To modem
3
2
4
8
5
7
6
20
Receive Data
Transmit Data
Request to Send
Carrier Detect
Clear to Send
Signal Ground
Data Set Ready
Data Terminal Ready RxD
TxD
RTS
CD
CTS
GND
DSR
DTR TxD
RxD
RTS
CD
CTS
GND
DSR
DTR
Transmit Data
Receive Data
Request to Send
Carrier Detect
Clear to Send
Signal Ground
Data Set Ready
Data Terminal Ready
3
2
7
1
8
5
6
4
Name Name Abbr Abbr Pin Pin