Macintosh serial port pinouts – ZyXEL Communications Omni 288S User Manual
Page 129
Appendix C - Connector Pinouts
C-2
Macintosh Serial Port Pinouts
The following table shows the wiring of a modem Macintosh hardware
handshaking cable:
Mac
Din 8
Modem
DB 25
Description
1
4 & 20
DTR to RTS and DTR, Hardware Handshaking Out
2
5
CTS to CTS, Hardware Handshaking In
3
2
TX- to TXD, Data sent
4
7
GND, Ground
5
3
RX- to RXD, Data received
6
-
not connected
7
8
GPI to CD, Carrier detected
8
7
GND, Ground, needed for RS-232 connections
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