Распиновка, расположение выводов и внешний вид последовательного интерфейса:
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.
Contributor:
Joakim Цgren,
Pierre Olivier,
Ben Harris,
Nathan Schmidt
Source:
comp.sys.mac.comm FAQ Part 1
Apple Tech Info Library, Article ID: TECHINFO-0001699
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Document last modified: 2002-01-10