Re: USB Serial - RS232
Re: USB Serial - RS232
- Subject: Re: USB Serial - RS232
- From: "Daniel G. Kluge" <email@hidden>
- Date: Mon, 9 Jun 2008 00:00:48 +0200
Am 08.06.2008 um 20:49 schrieb Allen Curtis:
I went to the Prolific website and downloaded the device driver from
there. The package claims to be the same version that I have
installed. Installed the driver again and then I could see one of
the two devices I had purchased. (both of them were Prolific devices
according to System Profiler) Now when you plug in the device, a
device entry appears in /dev. The SerialPortSample program can find
the device!
Hello Allen,
congratulations, your device made it. It is unfortunately quite a mess
with the USB to serial devices. Even though practically all devices
you can find (iogear, keyspan, Aten) use the prolific PL2302 chip-set,
you have to rely on the vendor to supply an up-to-date driver, that's
the theory and the legal contract at least. Unfortunately some of
those Venduhs prefer (or at least in the past preferred) to bitch
about how unstable Apple's USB kernel Interface was, instead of doing
something.
If you have a device that doesn't work (due to lack of updated
driver), and uses the prolific chip, there is a way to fix that driver
[1] :
1. Locate the USB Vendor and Device ids of your USB-to-serial device
using System Profiler
2. Edit /System/Library/Extensions/ProlificUsbSerial.kext/Contents/
Info.plist to change idVendor and idProduct (don't forget to do a hex-
>dec conversion)
3. Reload the extension
And presto you have a driver, for a device whose product manager is
still twiddling thumbs on a Leopard compatible driver.
Question: This time when I rebooted the system after installing the
driver it said, updating the boot cache. I did not notice this
message before. Should this always appear when installing a new
driver? Perhaps this will be a clue in the future.
Don't know, I just do a kextload and that does it for me :-)
Cheers,
-daniel
[1] Freely adapted from http://www.macosxhints.com/article.php?story=20060105104506687&lsrc=osxh
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