Pinouts of Connectors

Apple LaserWriter Serial connector pinout

layout
schematic diagram
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25 pin D-SUB FEMALE connector pin-out & 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 <-- ?

Note: Direction is Printer relative Computer.

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25 pin D-SUB MALE connector pin-outs & layouts
25 pin D-SUB MALE connector
Pinouts.ru > Pinouts of serial ports >  Pinout of Apple LaserWriter Serial connector and layout of 25 pin D-SUB FEMALE connector and 25 pin D-SUB MALE connector

Source(s): Technote HW19: Pinouts at Apple Technical Notes, from Hardware Book
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