Installed osx-pl2303-0.2.1-10.4-universal on a Macbook (10.4.6), for an ATEN adapter Product ID: 0x2008 Vendor ID: 0x0557 (don't know the model name: the label has come off, but I can see the ATEN name through the semi-transparent plastic case http://www.altronics.com.au/images/prod/D/D2340.gif\).
The driver works very well, including BREAK. Thanks!
I was initially put off by the following in system.log when plugging in the device:
Jun 14 20:11:55 hutch kernel: USBF: 170.505 IOUSBCompositeDriver[0x4da8500] Could not open device (USB-Serial Controller)
Presumably this is harmless?
It is ugly but harmless. At the moment I don't know how to solve it. And if you look at the osx_pl2303.cpp file you can notice the following comment:
* - Implementation Powermanagement
* - Fix USBF: Could not open device: Strange error message