Pinouts of Connectors

AppleLine RS232 connector pinout

layout
schematic diagram
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25 pin D-SUB MALE connector pin-out & layout
25 pin D-SUB MALE connector  at the computer
Pin Name Dir Description
1 SNG --- Shield ground
2 TXD --> Tx Transmit Data, Out
3 RCD <-- Rx Receive Data, In
4 RTS --> Request to Send, Out
5 CTS <-- Clear to Send, In
6 DSR <-- Data Set Ready, In
7 GND --- Ground
8 DCD <-- Data Carrier Detect, In
9 n/c   No connection
10 n/c   No connection
11 n/c   No connection
12 CH <-- Data signal rate selector, In
13 n/c   No connection
14 n/c   No connection
15 n/c   No connection
16 n/c   No connection
17 n/c   No connection
18 n/c   No connection
19 n/c   No connection
20 DTR Terminal Ready Signal, Out
21 n/c   No connection
22 CE <-- Ring indicator, In
23 n/c   No connection
24 n/c   No connection
25 n/c   No connection

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Pinouts.ru > Pinouts of serial ports >  Pinout of AppleLine RS232 connector and layout of 25 pin D-SUB MALE connector

Source(s): Apple Tech Info Library 1184: AppleLine Pinouts at Apple TIL homepage, from Hardware Book
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