Pinouts of Connectors

Apple Macintosh RS-422 connector pinout

schematic diagram

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It´s possible to connect RS-232 peripheral to the RS-422 port available on Macintosh computers. Use RXD- as RXD, TXD- as TXD, Ground RXD+, Leave TXD+ unconnected, GPi as CD.

8 pin MINI-DIN FEMALE connector pin-out & layout
8 pin MINI-DIN FEMALE connector  at the computer
Pin Name Dir Description
1 HSKo --> Output Handshake
2 HSKi/CLK <-- Input Handshake or External Clock
3 TXD- --> Transmit Data (-)
4 GND --- Ground
5 RXD- <-- Receive Data (-)
6 TXD+ --> Transmit Data (+)
7 GPi <-- General Purpose Input
8 RXD+ <-- Receive Data (+)
On serial port A (modem), if the VIA1 SYNC signal is high, this input will be routed to the receive/transmit clock input of the SCC. This clock input supports high-speed synchronous devices. Pin 7 is not connected on the Macintosh Plus, LC, or IIsi.

Note: Direction is DTE (Computer) relative DCE (Modem).

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You can confirm this document to be correct (be careful), or report an error in document (error may be described in the following webpage). Result of your submission will be used for calculating document status shown at the bottom of this page. > Pinouts of serial ports >  Pinout of Apple Macintosh RS-422 connector and layout of 8 pin MINI-DIN FEMALE connector

Source(s): comp.sys.mac.comm FAQ Part 1, Apple Tech Info Library, Article ID: TECHINFO-0001699, from Hardware Book, Pierre Olivier, Ben Harris, Nathan Schmidt
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