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Appendix A: RS-232 Connections
Appendix A. RS-232 Connections
A.1 2- and 4-Port Serial Server DB9 Pinouts in RS-232 Mode
Figure A-1. DB9 connector.
Table A-1. DB9 connector pinout.
RS-232 Signal Name
DTE
RS-232
DB9 M Pin
Carrier Detect
In
DCD
1
Receive Data
In
RXD
2
Transmit Data
Out
TXD
3
Data Terminal Ready
Out
DTR
4
Signal Ground
—
GND
5
Data Set Ready
In
DSR
6
Request To Send
Out
RTS
7
Clear To Send
In
CTS
8
Ring Indicator
In
RI
9
A.2 1-Port Serial Server Terminal Block Pinout in RS-232 Mode
Figure A-2. Terminal block connector.
Table A-2. 1-Port Serial Server Terminal Block
Pinout in RS-232 Mode.
RS-232 Signal Name
DTE
RS-232
Terminal
Signal Ground
—
GND
1
Clear To Send
In
CTS
2
Transmit Data
Out
TXD
3
Receive Data
In
RXD
4
Request To Send
Out
RTS
5