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Macintosh RS-422

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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 (At the computer)

8 PIN MINI-DIN FEMALE at the computer.

Pin Name Dir Description
1 HSKo OUT Output Handshake
2 HSKi/CLK IN Input Handshake or External Clock
3 TXD- OUT Transmit Data (-)
4 GND ------ Ground
5 RXD- IN Receive Data (-)
6 TXD+ OUT Transmit Data (+)
7 GPi IN General Purpose Input
8 RXD+ IN Receive Data (+)

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

Note: GPi is connected to SCC Data Carrier Detect (or to Receive/Transmit Clock if the VIA1 SYNC signal is high). Not connected on the Macintosh Plus, Classic, Classic II, LC, LC II or IIsi.


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