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From: Krzysztof Halasa <khc@pm.waw.pl>
To: Gene Heskett <gene.heskett@gmail.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>,
	David Newall <davidn@davidnewall.com>, Greg KH <greg@kroah.com>,
	linux-usb@vger.kernel.org,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: Handshaking on USB serial devices
Date: Thu, 14 Feb 2008 23:39:09 +0100	[thread overview]
Message-ID: <m3k5l7uprm.fsf@maximus.localdomain> (raw)
In-Reply-To: <200802141116.14722.gene.heskett@gmail.com> (Gene Heskett's message of "Thu\, 14 Feb 2008 11\:16\:14 -0500")

Gene Heskett <gene.heskett@gmail.com> writes:

> Apparently they do not Alan, the pl2303 in particular is a problem child, 
> throwing several lost com errors a day when doing nothing more strenuous than 
> talking to my belkin UPS from apcupsd, very small packets there, 20 bytes I 
> believe at several second intervals.

Is your UPS using "modern" hardware handshaking (CTS = PC can send,
with RTS practically always asserted)? Or perhaps the "old",
"half-duplex" V.24-style (RTS asserted before TX and then waiting for
CTS)?

Are you sure it uses hw handshaking at all? Most (all?) UPSes I used
had only TxD and RxD (for RS-232).
-- 
Krzysztof Halasa

  parent reply	other threads:[~2008-02-14 22:39 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-13 14:45 David Newall
2008-02-14  5:02 ` Greg KH
2008-02-14  9:25   ` David Newall
2008-02-14 12:10     ` Alan Cox
2008-02-14 16:16       ` Gene Heskett
2008-02-14 16:31         ` Alan Cox
2008-02-14 17:55           ` Gene Heskett
2008-02-14 19:37             ` Alan Cox
2008-02-14 20:04               ` Gene Heskett
2008-02-14 20:52                 ` Greg KH
2008-02-14 21:32                   ` Gene Heskett
2008-02-15  5:08               ` David Newall
2008-02-14 22:39         ` Krzysztof Halasa [this message]
2008-02-14 23:09           ` Gene Heskett
2008-02-14 18:04       ` David Newall
2008-02-14 18:53         ` David Brownell
2008-02-14 19:36         ` Alan Cox
2008-02-21 15:22           ` David Newall
2008-02-21 15:15             ` Alan Cox
2008-02-21 19:35               ` David Newall
2008-02-21 20:58                 ` Greg KH
2008-02-14 20:47     ` Greg KH
2008-02-15  5:19       ` David Newall
2008-02-14 11:55   ` Alan Cox
     [not found] <9Wr5Z-7cw-1@gated-at.bofh.it>
     [not found] ` <9WSJ4-222-21@gated-at.bofh.it>
     [not found]   ` <9WTlN-2T0-7@gated-at.bofh.it>
     [not found]     ` <9WTYn-3Zb-29@gated-at.bofh.it>
2008-02-15 12:00       ` Bodo Eggert

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