linux-kernel - Re: Handshaking on USB serial devices

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Message-ID: <m3k5l7uprm.fsf@maximus.localdomain>
Date:	Thu, 14 Feb 2008 23:39:09 +0100
From:	Krzysztof Halasa <khc@...waw.pl>
To:	Gene Heskett <gene.heskett@...il.com>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	David Newall <davidn@...idnewall.com>,
	Greg KH <greg@...ah.com>, linux-usb@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Handshaking on USB serial devices

Gene Heskett <gene.heskett@...il.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
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