pinout (распиновка)

Macintosh RS-422 connector

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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  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.

Источник: comp.sys.mac.comm FAQ Part 1
Sources: Apple Tech Info Library, Article ID: TECHINFO-0001699