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This cable should be used for DTE to DCE (for instance computer to modem) connections with DTR.
  Mac Dir Modem  
HSKo 1 --> 4+20 RTS+DTR
HSKi 2 <-- 5 CTS
TxD- 3 --> 2 TxD
RxD- 5 <-- 3 RxD
GND+RxD+ 4+8 - 7 GND
GPi 7 <-- 8 DCD
25 pin D-SUB male connector layout
25 pin D-SUB male connector
at the modem
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Source(s) of this and additional information: comp.sys.mac.comm FAQ Part 1, from J. Ogren and Pierre Oliv
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