Serial Ports on the Mac

Adapters I tested

Keyspan USB Twin Serial and PDA Adapters

Driver

Aten UC-232A

Driver

UC320/Prolific

Driver

Pinouts for adapter cables

mini DIN-8
D-Sub-9
D-Sub-25
Abbreviation
Full Name
Pin 1
Pin 7
Pin 4
RTS
Request To Send
Pin 1
Pin 4
Pin 20
DTR
Data Terminal Ready
Pin 2
Pin 8
Pin 5
CTS
Clear To Send
Pin 3
Pin 3
Pin 2
TxD
Transmit Data
Pin 4, 8
Pin 5
Pin 7
SG
Signal Ground
Pin 5
Pin 2
Pin 3
RxD
Receive Data
Pin 7
Pin 1
Pin 8
CD
Carrier Detect
-
Pin 6
Pin 6
DSR
Data Set Ready
-
Pin 9
Pin 22
RI
Ring Indicator

 

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