Macintosh Serial Port Pinouts - ZyXEL Communications U-336S User Manual

Macintosh Serial Port Pinouts

The following table shows the wiring of a modem Macintosh hardware
handshaking cable:
Mac
Din 8
1
2
3
4
5
6
7
8
144 Connector Pinouts
Modem Description
DB 25
4 & 20 DTR to RTS and DTR, Hardware
Handshaking Out
5 CTS to CTS, Hardware Handshaking In
2 TX- to TXD, Data sent
7 GND, Ground
3 RX- to RXD, Data received
- not connected
8 GPI to CD, Carrier detected
7 GND, Ground, needed for RS-232
connections