Tonight I needed to console into a old Cisco 2900 switch to test a couple password related items and it was the first time that I would be using USB to Serial adapter on my Macbook. Previously there had been a lot of issues with the adapter I have, which is a PL-2303, and getting the right drivers installed on Windows 7 64-bit so I was thinking there might not even be drivers available for OSX Lion. After a little research I cam across an article that purehate had written on QD however after following the instructions in the article the USB to Serial adapter still was not working. Below is information on installing newer drivers that will work on OSX Lion.
I have had the same USB to serial adapter working on Windows XP for quite awhile. After I recently purchased a new laptop running Windows 7 64-Bit I needed to reinstall my USB to Serial Converter. I had a couple issues the first being the fact that the Dell Studio XPS laptop has a slot load CD/DVD drive and the drivers were on a mini CD. So the first thing I tried was to zip up the drivers CD that initially came with the USB to Serial Converter and get the zip file over to the new laptop. After doing this and attempting to install the drivers I was still receiving an error. I imagine either the drivers were not working with Windows 7 or there were no 64-bit drivers. Below I explain the USB error that was displaying, provide access to the correct drivers, and provide steps to install the drivers.