3Com NETBuilder II Installing Instruction page 15

To CONSOLE port
9-pin female connector
Receive Data
Transmit Data
Carrier Detect
Clear to Send
Request to Send
Signal Ground
Data Terminal Ready
Data Set Ready
Figure 1-4 9-pin to 25-pin Terminal Cable (Null Modem-Type)
To CONSOLE port
9-pin female connector
Name
Transmit Data
Receive Data
Request to Send
Carrier Detect
Clear to Send
Signal Ground
Data Set Ready
Data Terminal Ready
Figure 1-5 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.
5 4 3 2 1
9 8 7 6
25-pin male or female connector
Name Abbr Pin
RxD
2
TxD
3
CD
1
CTS
8
RTS
7
GND
5
DTR
4
DSR
6
5 4 3 2 1
9 8 7 6
Abbr Pin Pin
TxD 3 3
RxD 2 2
RTS 7 4
CD
1 8
CTS
8 5
GND 5 7
DSR 6 6
DTR 4 20
Installing the 4-Slot Chassis
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
Pin Abbr Name
TxD
Transmit Data
2
RxD
Receive Data
3
RTS
Request to Send
4
CTS
Clear to Send
5
CD
Carrier Detect
8
GND
Signal Ground
7
DSR
Data Set Ready
6
DTR
Data Terminal Ready
20
To modem
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
25-pin male connector
Abbr Name
RxD Receive Data
TxD Transmit Data
RTS Request to Send
CD Carrier Detect
CTS Clear to Send
GND Signal Ground
DSR Data Set Ready
DTR Data Terminal Ready
1-5