Sometimes, sometimes not.  Modem behavior when DTR drops is a configurable
option on most (maybe all) modern modems.  Options range from "ignore DTR"
to "hang up on DTR drop" to "auto-dial on DTR rise" to "reset on DTR
drop".  Most can be configured with AT commands, but some are DIP switch
selected.  And of course the Rockwell/Lucent/Hayes and USR command options
are totally different, so you have to either design for one and only one,
or figure out which you're talking to.

Dale
--
"Curiosity is the very basis of education and if you tell me that
curiosity killed the cat, I say only the cat died nobly."
          - Arnold Edinborough


On Thu, 28 Feb 2002, Barry Gershenfeld wrote:

> Unless they have redesigned the modems yet again (and why not, eh?) you
> may be able to put the modem into a known reset state by dropping DTR
> for a short time.

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