Re: Handshaking on USB serial devices

[Krzysztof Halasa]

Gene Heskett <gene.heskett@xxxxxxxxx> 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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