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25 pin D-SUB female connector layout
25 pin D-SUB female connector
Pin Name Dir Description
1 GND --- Ground
2 TXD- --> Transmit Data
3 RXD- <-- Receive Data
4 RTS --> Request To Send
5 CTS <-- Clear To Send
6 DSR <-- Data Set Ready
7 GND --- Ground
8 DCD --> Data Carrier Detect
20 DTR- --> Data Terminal Ready
22 RING <-- ?
25 pin D-SUB male connector layout
25 pin D-SUB male connector
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Source(s) of this and additional information: Technote HW19: Pinouts at Apple Technical Notes, from Hardware Book
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