linux-kernel - Re: pl2303_ttyUSB0 userspace application not able to control RTS line

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Message-Id: <20101006034210.M38114@admin-gateway.ncra.tifr.res.in>
Date:	Wed, 6 Oct 2010 09:44:38 +0530
From:	"Raju Rameshwar Uprade" <rajsingh@...a.tifr.res.in>
To:	Greg KH <gregkh@...e.de>,
	Raju Rameshwar Uprade <rajsingh@...a.tifr.res.in>
Cc:	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: pl2303_ttyUSB0 userspace application not able to control RTS line

 
> Is this your "modified" driver?
   
  No..It's pl2303.

> 
> I don't see that error in the kernel log below at all.

 sometimes I got that error.
 
> What kernel version is this?

 2.6.35

> And are you sure that your device actually has the RTS lines connected?
> I have seen a number of these devices that do not bring those lines from
> the chip to the rs232 connection.

I have connected a RS-485 interface card to this usb-to-serial converter which has
MAX-485 IC ( Line driver chip which convert RS-232 to RS-485),of which pin number 2 is
for RTS line.

Through my modified pl2303 device driver, I am able to enable/disable the RTS line as
per my need,as I told in my earlier email.

> You really might want to go purchase a "real" usb to serial converter
> that works properly, the pl2303 devices do not fit that category.

Yes, I am also thinking of purchasing a "real" usb to serial converter.

Thanks a lot Greg, I have learned a lot interacting with you.


Thanks-
Raj
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