From: Matt Schulte <matts@commtech-fastcom.com>
To: linux-serial@vger.kernel.org
Subject: Re: [PATCH/RFC] 8250: Auto RS485 direction control
Date: Mon, 04 Aug 2008 15:59:06 -0500 [thread overview]
Message-ID: <48976D9A.6020803@commtech-fastcom.com> (raw)
In-Reply-To: <g77f8p$plq$1@ger.gmane.org>
>> 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. ;)
>
Believe it or not, it actually has a purpose. That way you can use
RTS/CTS hardware flow control AND have RS485 driver control using the
DTR pin.
Matt Schulte
next prev parent reply other threads:[~2008-08-04 20:59 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-24 11:47 [PATCH/RFC] 8250: Auto RS485 direction control Laurent Pinchart
2008-07-24 11:57 ` Alan Cox
2008-07-24 12:24 ` Russell King
2008-07-24 12:27 ` Alan Cox
2008-07-24 12:52 ` Russell King
2008-07-24 13:00 ` Alan Cox
2008-07-24 13:18 ` Laurent Pinchart
2008-07-24 14:13 ` Matt Schulte
2008-07-24 14:47 ` Russell King
2008-07-24 12:10 ` Russell King
2008-08-04 14:14 ` Tosoni
2008-08-04 14:22 ` Grant Edwards
2008-08-04 14:36 ` Laurent Pinchart
2008-08-04 16:15 ` Grant Edwards
2008-08-04 16:21 ` Grant Edwards
2008-08-05 9:41 ` Laurent Pinchart
2008-08-05 12:55 ` Tosoni
2008-08-06 14:30 ` Christopher Gibson
2008-08-06 16:33 ` Tosoni
2008-08-09 10:08 ` Christopher Gibson
2008-08-07 8:50 ` Laurent Pinchart
2008-08-07 13:50 ` Grant Edwards
2008-08-10 3:49 ` Christopher Gibson
2008-08-10 3:57 ` Christopher Gibson
2008-08-29 12:22 ` Christopher Gibson
2008-12-02 13:09 ` [PATCH/RFC] " Christopher Gibson
2008-12-04 11:14 ` Christopher Gibson
2008-08-04 16:47 ` [PATCH/RFC] 8250: " Tosoni
2008-08-04 17:46 ` Grant Edwards
2008-08-04 20:59 ` Matt Schulte [this message]
2008-08-05 9:23 ` Laurent Pinchart
2008-08-05 9:34 ` Tosoni
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