On Thu, 23 May 2002, Greg KH wrote:

> On Thu, May 23, 2002 at 05:19:08PM -0500, Chris Kotrla wrote:
> > Hello,
> >
> > I'm trying to install the Belkin F5U109 USB-serial adapter in my debian
> > install running 2.4.18.  Searching google for help yielded some mails from
> > this list, but I didn't find anything conclusive.
> >
> > Evidently the belkin module is not the right one to use, but rather the
> > mct_u232 is the module that has support for the belkin F5U109.  I install
> > it and usbserial, and everything looks good when I plug it in:
> >
> > ---
> > May 23 16:54:47 cottonmouth kernel: hub.c: USB new device connect on
> > bus1/2, assigned device number 3
> > May 23 16:54:47 cottonmouth kernel: usbserial.c: Magic Control Technology
> > USB-RS232 converter detected
> > May 23 16:54:47 cottonmouth kernel: usbserial.c: Magic Control Technology
> > USB-RS232 converter now attached to ttyUSB0 (or usb/tts/0 for devfs)
> > ---
> >
> > Note that it's not actually a Magic Control Technology USB-RS232
> > converter; its a Belkin.  I'm guessing Magic Control Tech OEMed the
> > product?
>
> Belkin OEMed the product.
>
> > Anyway, the device has three lights on it: LINK, TX, and RX.  The link
> > light is always on when it's plugged in.  When I echo 'some stuff' >
> > /dev/ttyUSB0, the LINK light blinks, but nothing else happens.  On a
> > windows box, when I send stuff, the TX light does blink (as it should).
>
> Does the data go through properly?

No, it never makes it.  I've tried a couple of different serial devices,
but not had any luck.


>
> > The device I'm trying to control only works at 2400 baud, so I set the
> > baudrate: stty 2400 < /dev/ttyUSB0.  The device doesn't show any sign of
> > being sent anything, though.
>
> stty doesn't send data, what do you think should be sent?
>

Right - I mean that later, when I try to send something, it never makes
it.


> > Anyone know what I'm doing wrong here?  As far as I can tell, the mct_u232
> > should work fine.  I checked the source code and saw a comment indicating
> > that it was updated to support the Belkin F5u109.
> >
> > Any help would be appreciated!
>
> Have you tried using a serial based program to talk to the device,
> instead of just "echo"?  I've found that echo doesn't work very well for
> serial devices, but programs like minicom or kermit work just fine.
> Have you tried them?

I tried minicom, and I get similar results.  When I try sending something
to the adapter, the "link" light will blink with each key press.  One
interesting thing I've noticed, though, is that after I press enough keys,
the usb-serial adapter seems to completely freeze up and doesn't accept
any more input.  Minicom also seems dead at this point.  I tried killing
minicom and reopening it, but it the serial-usb adapter doesn't even blink
any more.

I'm a relative newbie to linux, so it's entirely possible that I'm missing
something really simply here - but I know I have the right driver, and I
know it's recognizing and at least somewhat communicating with the
adapter.  Does it make any difference if I compile the mct_u232 into the
kernel or load it as a module? (I've tried both).

I've even patched the kernel to the 2.4.19-pre8 but it doesn't seem to
have made any difference.

I know the adapter works, 'cuz I've used it on a windows box, and at the
same time, I'm having this problem with two different linux boxes - that's
why I'm guessing there must be some simple thing I'm missing.

Any clues?

Thanks again for everyone's help.

-Chris



>
> thanks,
>
> greg k-h
>


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