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.
| Source: |
comp.sys.mac.comm FAQ Part 1
|
|
Apple Tech Info Library, Article ID: TECHINFO-0001699
|
Copyright © The Hardware Book Team 1996-2004.
May be copied and redistributed, partially or in whole, as appropriate.
Document last modified: 2002-01-10
|
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