144 Connector Pinouts
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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