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Macintosh RS-422

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.

 (at the computer)

8 PIN MINI-DIN FEMALE 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 (+)

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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