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Allied Data Technologies
APPENDIX C
RS232C connector
CCITT
No.
Direction Name
Abbreviated
LED
109
1
OUT
Data carrier detect
(CD)
CD
104
2
OUT
Received Data
(RxD)
RxD
103
3
IN
Transmitted Data
(TxD)
TxD
108
4
IN
Data terminal ready
(DTR)
DTR
5
-
Signal Ground
(GND)
107
6
OUT
Data set ready
(DSR)
105
7
IN
Request to send
(RTS)
106
8
OUT
Clear to send
(CTS)
125
9
OUT
Ring indicator
(RI)
AA
RS232C connector