Serial interfaces cables and converters scheme  > Apple pinouts
Pin Name Dir Description
1 GND --- Ground
2 SD --> Send Data
3 RD <-- Receive Data
4 RTS --> Request To Send
7 GND --- Ground
14 FAULT- --> False when deselected
20 DTR <-- Data Terminal Ready
25 pin D-SUB male connector layout
25 pin D-SUB male connector
25 pin D-SUB female connector layout
25 pin D-SUB female 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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