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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
122 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
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Troubleshooting
