uplcom a callin only device?

Emanuel Strobl Emanuel.strobl at gmx.net
Wed Jun 29 12:30:11 GMT 2005

Am Mittwoch, 29. Juni 2005 10:55 schrieb Norbert Koch:
> Hello.
> I'm trying to get a sub-to-rs232 adaptor running with FreeBSD-5.
> The vendor of this adaptor is some chinese company named
> High-Edge Tech, but as usbdevs shows, it identifies as
> For testing, I connect the adaptor with the same computer's cuaa0 and
> do an 'stty speed 9600 clocal' on /dev/ucom0 and /dev/cuaia0.
> Now, if I do 'cat < /dev/ucom0' and 'cat > /dev/cuaa0', I see typed
> characters coming in. If I try the opposite direction, nothing happens.
> Is that something, I should've expected, and if so, why?

There are different versions of the prolific chipset and unfortunately they 
changed the init sequence of version 3.00 and up without changing the 
device ID (If you're interested for more check the archives (current) 
arround January 21st).

5.4 has the new uplcom driver which checks the revision maybe you can apply 
the cvs version to your 5.3 (guess).


> Does it have to do with the difference of callin and callout
> devices? Can I use /dev/ucom0 only as callin device like /dev/ttyd0?
> Thanks,
> Norbert
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