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
next prev 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 Handshaking on USB serial devices 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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