[SGVLUG] USB/RS232 adapters

[Claude Felizardo]

okay, so I got an email from a friend and when he plugs his cable in,
it's loading a different module called pl2303 but it doesn't create
the device.  I can do a 'mknod -m a=rw /dev/ttyUSB0 c 188 0' to create
the device but of course it's not associated with that driver. If I
try to run my application, I get an error saying "Can't open tty line"
as expected.

Anyone have any idea how to tell the system to load a different module?


On 10/11/07, Michael Proctor-Smith <mproctor13 at gmail.com> wrote:
> On 10/11/07, Claude Felizardo <cafelizardo at gmail.com> wrote:
> > Has anyone had any luck with USB to RS232 adapters?
> >
> > I've been trying to get at least one of the x10 controllers to work on
> > my laptop but haven't had any luck.  My laptop doesn't have any RS232
> > ports so I first tried a CM15A which is USB and I know works on my
> > winXP box.  Unfortunately, X-10 never released the specs so it looks
> > like everyone gave up when Smarthome came out with their Insteon line
> > and provided more help.  The last set of drivers I could find were
> > dated 12/2004 and supported Linux 2.4 and possibly 2.6 but when I
> > tried it with my 2.6.17 kernel I got warnings and errors which I tried
> > to resolve but I couldn't get it to work. Either that or the sample
> > app is broken.
> >
> > So then I tried a USB/RS232 cable I had lying around.  The system
> > recognizes it as an HID->COM RS232 Adapter and loads the cypress
> > driver which creates the /dev/ttyUSB0 device.  Using the latest 2.x
> > version of heyu (and x10 app for Linux), I get timeouts and errors
> > when I try it access either the CM11A or CM17A X10 controllers.   If I
> > try this on my fileserver which actually has a VScom 400H 4 port
> > serial adapter using /dev/ttyS2 it works fine.  Fails when I try USB.
> >
> > Now I did get this USB/RS232 adapter several years ago so it's
> > possible its broken.  I'm pretty sure it was working with a windoze
> > GPS app but it's been a while plus I may never have gotten around to
> > trying it via Linux as I had gotten a new GPS receiver that has a USB
> > port.
> >
> > So, can anyone recommend a USB/RS232 adapter that they have used with
> > Linux?  If possible, can they bring it to tonight's meeting so I can
> > verify it works with x10?  Then I can try and pick one up in time for
> > my demo next month?  I really don't want to have to lug my fileserver
> > into the meeting as well as the other gear.
>
> I have found I wanted to use usb/rs232 adapter to talk to a OBDII
> interface that most usb/serial adaptors drivers to not implement a
> full serial port only a subset. I can bring one to try but I think the
> problem is the kernel drivers for alot of hardware is reworked copies
> of the same driver that does not implement the whole driver.
>
> > claude
> >
>