Apple Macintosh RS-422 Serial

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8 PIN MINI-DIN FEMALE 8 PIN MINI-DIN FEMALE at the computer.

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 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 (+)

Notes

  • Direction is DTE (Computer) relative DCE (Modem)
  • 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.

References

Category:Serial Connectors

 

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