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10.3: A quick fix for USB-to-Serial (MCT) support System
I have been having a terrible time getting the standard USB-to-Serial driver used for MCT to work under Panther, although it used to work under 10.2. Part of the story has been detailed here at OSXHints in the discussion boards. The driver typically used can be found here [mct.com].

I found a quick fix for what appears to be a permissions problem. I have tried it with two Garmin GPS receivers, and both appear to now work. The quick fix is as follows:
 % sudo chmod -R og-w /System/Library/Extensions/USBSerialDriver.kext
 % chown -R root:wheel/System/Library/Extensions/USBSerialDriver.kext
[robg adds: I can't confirm this one...]
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10.3: A quick fix for USB-to-Serial (MCT) support | 9 comments | Create New Account
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10.3: A quick fix for USB-to-Serial (MCT) support
Authored by: seann on Feb 11, '04 12:20:29PM

What was the original problem?
And is this related to 10.3.2 not working with Parallel 2 USB Cables?

And if no, can copying the old IOSerialFamily.kext from 10.3.1 to 10.3.2, or
IOUSBFamily.kext from 10.3.1 to 10.3.2 fix this?



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10.3: A quick fix for USB-to-Serial (MCT) support
Authored by: seann on Feb 11, '04 12:22:23PM

Also I realize that the posters USBSerialDriver.kext is downloaded from the website, but IOSerialFamily.kext is included in 10.3.x



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10.3: A quick fix for USB-to-Serial (MCT) support
Authored by: xSmurf on Feb 11, '04 02:10:49PM

This is a little off, but all I found on the net was regarding the HP driver... I have this kernel_task problem where at one point it starts eating a good part of the cpu time. Now I've traced this problem (mostly has it has occured one or twice since) to my Keyspan Twin Serial adapter. Anyone has a clue for a fix to this?

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PM G4 DP 800 / 256Mb / 80Gb+40Gb /SuperDrive / SCSI: AGFA SnapScan 1236s / Jaz 1Gb / Zip 100Mb
- The only APP Smurf ;P



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10.3: A quick fix for USB-to-Serial (MCT) support
Authored by: ganoe on Apr 13, '04 12:54:17PM

Thanks! This seemed to help with getting my Belkin F5U109 USB to serial adapter to work under 10.3. I haven't fully tested it yet, but it no longer says the driver is bad and I could get some of the lights to blink using PortTerm. The Belkin Beta 10.2 driver is here:
http://www.belkin.com/beta/



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10.3: A quick fix for USB-to-Serial (MCT) support
Authored by: rodl2 on May 29, '04 10:46:30PM

I have the same Belkin adapter. I reinstalled the driver & used the two Terminal commands [Using the file path to the BelkinSerialDriver.kext]. I then rebooted & still got the same error. Exactly what did you do to make it work?

---
"He who limps still walks." -Stanislaw Lec

"If it moves and it shouldn't, use duct tape. If it doesn't move and it should, use WD-40." --CC



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10.3: A quick fix for USB-to-Serial (MCT) support
Authored by: ganoe on Jul 05, '04 01:27:17PM

There seems to be a space missing between the "root:wheel" and the path to the driver in the second command.



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10.3: A quick fix for USB-to-Serial (MCT) support
Authored by: ganoe on Sep 26, '04 08:31:54AM
I seem to get some e-mails from people on this, so I thought I'd provide more details. As I said, there is a space missing in one of the commands in the original message, plus the driver name for the Belkin driver is slightly different. The commands are:

sudo chmod -R og-w /System/Library/Extensions/BelkinSerialDriver.kext
sudo chown -R root:wheel /System/Library/Extensions/BelkinSerialDriver.kext
Anyhow, I hope this works for you. No guarantees on my part, but it seemed to work for me. The Belkin beta driver website unfortunately does not seem to be available anymore though, so I hope the driver can be found elsewhere.

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10.3: A quick fix for USB-to-Serial (MCT) support
Authored by: tntbaba on Jun 12, '05 03:39:56AM

Thank you for the assistance and I have found a link to the Belkin OSX driver for the Serial-to-USB Converter at the following site:

http://www.ht.com.au/attach/Files/AJQM.ZIP

The site also has a document that explains the installation process.

Thank you!


---
Stephen Hawkings' Mom Quote: "You have to find out what you can't know before you know you can't, don't you?"



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10.3: A quick fix for USB-to-Serial (MCT) support
Authored by: mlgoodson on May 28, '04 10:38:24AM

Short Version...
Had the same problem, but changing ownership didn't ultimately solve the problem, but getting the Prolific PL2303G driver did.

The Full Story...
I seemed to have been having the same problem with my MCT U232-P9(M?--it has a 6ft cord) UBS-to-Serial adapter. I am using it to connect a Garmin Geko 201 GPS and use MacGPS Pro (5). Before changing owner System Profiler/System/Extensions said that there were permission errors and that is was not authentic. Changed the owner as described and this was corrected and SP now said it was authentic. However when I plugged in my adapter it still won't load. Can't really say as I know why. Anyway, the adapter came with a CD with a bunch of drivers for stuff that I didn't have. After a little playing around, I found the Y-105 driver was for my USB-Serial adapter. This driver installed a PL2303G system extension for the classic OS. This got me looking some more and I ran across the Prolific USB-Serial adapter and found an PL2303G driver for OS X (I found it at http://www.sewelld.com/USBtoSerialSupportMac.asp). After installing, my adapter now works fine and I can connect my GPS to MacGPSPro.



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