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.
| 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 (+) |
correct
incorrect