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Pin assignments
Serial
COM1
COM2
COM3
9 pin D-SUB Male
No
IN/OUT
1
IN
CD
2
IN
RD
3
OUT
TD
4
OUT
DTR
5
GND
6
IN
DSR
7
OUT
RTS
8
IN
CTS
9
IN
RI
9 pin D-SUB Male
No
IN/OUT
1
IN
CD
2
IN
RD
3
OUT
TD
4
OUT
DTR
5
GND
6
IN
DSR
7
OUT
RTS
8
IN
CTS
9
IN
RI
8 pin Modular
No
IN/OUT
1
FG
2
OUT
RTS
3
IN
RD
4
IN
DSR or +5V or CD (Default)
5
OUT
TD
6
OUT
DTR
7
GND
8
IN
CTS (Default) or Not Connected
1-9
Signal
Signal
Signal
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