RS-232 and other serial ports and interfaces  > Apple pinouts
Pin Name Description
1GNDGround
2TxD-Transmit Data line
3RxD-Receive Data line
4n/cNot connected
5n/cNot connected
6HSK/DSRTRxCB or CTSB
7GNDGround
8n/cNot connected
9n/cNot connected
10n/cNot connected
11n/cNot connected
12n/cNot connected
13n/cNot connected
14n/cNot connected
15n/cNot connected
16n/cNot connected
17n/cNot connected
18n/cNot connected
19RxD+Receive Data line
20TxD+/DTRConnected to DTRB
21n/cNot connected
22n/cNot connected
23n/cNot connected
24n/cNot connected
25n/cNot connected
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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