Appendix b null modem cable specifications, User manual – LevelOne ProCon GSW-2690 User Manual
Page 237
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User Manual
Publication date: June, 2005
Revision A1
233
Appendix B
Null Modem Cable
Specifications
The DB-9 cable is used for connecting a terminal or terminal emulator to the
Managed Switch’s RS-232 port to access the command-line interface.
The table below shows the pin assignments for the DB-9 cable.
Function
Mnemonic
Pin
Carrier
CD
1
Receive Data
RXD
2
Transmit Data
TXD
3
Data Terminal Ready
DTR
4
Signal Ground
GND
5
Data Set Ready
DSR
6
Request To Send
RTS
7
Clear To Send
CTS
8
9 Pin Null Modem Cable
CD
1
4
DTR
DSR
6
1
CD
DTR 4
6 DSR
RXD
2
3
TXD
TXD
3
2
RXD
GND
5
5
GND
RTS
7
8
CTS
CTS
8
7
RTS
Reserve 9
9
Reserve
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