# Apple LaserWriter Serial

25 PIN D-SUB 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.

Contributor: Joakim Ögren

Source:
Technote HW19: Pinouts at Apple Technical Notes

Copyright © The Hardware Book Team 1996-2001.
May be copied and redistributed, partially or in whole, as appropriate.
Document last modified: 2001-06-08