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.
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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 (+)
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8 pin mini-DIN female connector layout
8 pin mini-DIN female connector
at the computer
Source(s) of this and additional information: 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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