Archived - Mini DIN-8: Serial pinouts for Hayes modems

What are the cable pinouts for a Macintosh Plus or later connected to a Hayes modem (Mini DIN-8 to DB-25)?
This article has been archived and is no longer updated by Apple.
SignalDirectionDin-8 ConnectorHayes DCE ConnectorSignalDirection
HSKo Out16DSRIn
(DTR)20DTRIn
HSKi In28DCDOut
(CTS)5CTSOut
TxD-Out32TxDOut
Gnd41Gnd
87
RxD-In53RxDIn
6No connect
7No connect



Connect pins:

1. Macintosh side of cable: 4 and 8

2. Hayes side of cable:

a. 6 and 20
b. 8 and 5
c. 1 and 7

The pins on the male end of the circular Mini DIN-8 connector are numbered as shown:

6 7 8
3 4 5
1 2

You could also use the Apple II Printer - Mini DIN-8 Cable (part number 590-0556 or 590-0335), although the pinouts are slightly different.

Below are the pinouts for connecting the Hayes V series 9600 baud modems to the Macintosh with a DIN-8 serial port, direct from Hayes:

Hayes 9600 V Macintosh
1-7 4-8
2 3
3 5
5 2
4 1
Last Modified: Feb 19, 2012
  • Last Modified: Feb 19, 2012
  • Article: TA33785
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