A-6
Series 90-30 PLC Installation and Hardware Manual
–
August 2002
GFK-0356Q
A
Table A-4. IBM-AT/XT Serial Port Pins-out
IB
M-
AT
Pin
No.
Signal
Description
IBM-XT
Pin No.
Signal
Description
DCD
Data Carrier Detect
NC
2
RD
Receive Data
2
TD
Transmit Data
3
TD
Transmit Data
3
RD
Receive Data
4
DTR
Data Terminal Ready
4
RTS
Request to Send
5
GND
Signal Ground
5
CTS
Clear to Send
6
NC
6
NC
7
RTS
Request to Send
7
GND
Signal Ground
8
CTS
Clear to Send
8
DCD
Data Carrier Detect
9
NC
9
DTR
Data Terminal Ready
NC = Not Connected