RE: [PATCH/RFC] 8250: Auto RS485 direction control

Tosoni
2008-08-10T14:59:06Z

I agree with your understanding of the standard.

I guess that the Oxford guys wanted to keep the possibility of using both
RTS input flow control AND half-duplex.

JP Tosoni

> -----Original Message-----
> From: linux-serial-owner@vger.kernel.org
> [mailto:linux-serial-owner@vger.kernel.org]On Behalf Of Grant Edwards
> Sent: Monday, August 04, 2008 7:46 PM
> To: linux-serial@vger.kernel.org
> Subject: Re: [PATCH/RFC] 8250: Auto RS485 direction control
>
>
> On 2008-08-04, Tosoni <jp.tosoni@acksys.fr> wrote:
>
> > Last remark:
> >
> > Interestingly, the RTS envelope on the Oxford chips is
> > implemented with... the DTR pin. On our cards we have a piece
> > of hardware which redirect the uart DTR pin to the external
> > RTS in this case.
>
> Well, that's just plain wrong. The RS-232 standard was quite
> clear that RTS is what's used to enable transmission. ;)
>
> --
> Grant Edwards grante Yow! I
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