On 11/22/06, Robert Lewko <[EMAIL PROTECTED]> wrote:
The "not all" part is where some of these devices use the hardware lines to handshake. CTS/RTS lines are used and have to be supported for most devices. However, some devices use the DSR and DTR lines to augment the basic handshaking. I think that it is these lines that the USB cables don't support. You also have to have a correct cable, although most null modem cables that you buy support 90% of the devices. I have come across devices where I had to have a "breakout" box and make my own cable.
Something I forgot to add was this URL to a site where the info on serial cables is excellent: http://www.lammertbies.nl/comm/info/RS-232_null_modem.html On 11/22/06, Darcy Brodie <[EMAIL PROTECTED]> wrote:
> > Sorry - hit the wrong key > > I work in the security industry. Almost all of the electronic security > (alarm systems, card access systems, closed circuit camera systems, most > telephone systems for programing / backup / restore functions) all > require a serial connection. We have tried the USB => Serial adaptors, > and they will work for some of the security products, but not all. > > Darcy > > Darcy Brodie wrote: > > And I disagree with not making them. I know of a lot of applications > > that still require serial connections > > > > Darcy > > > > > > Mitchell Brown wrote: > > > >> I'm pretty sure someone makes a PCMCIA card for this purpose. Try > >> memxit.com <http://memxit.com> > >> > >> I agree with the decision to no longer make them though - I mean, who > >> uses them?! > >> > >> On 11/22/06, *Kin Wong* < [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED] > >> > >> wrote: > >> > >> As you know, new laptops are being made without serial > ports. Does > >> anyone know or has had success with serial ports cards or usb > serial > >> cables for laptops? > >> > >> > > > > > > _______________________________________________ > > clug-talk mailing list > > [email protected] > > http://clug.ca/mailman/listinfo/clug-talk_clug.ca > > Mailing List Guidelines ( http://clug.ca/ml_guidelines.php) > > **Please remove these lines when replying > > > > > > > > > > > _______________________________________________ > clug-talk mailing list > [email protected] > http://clug.ca/mailman/listinfo/clug-talk_clug.ca > Mailing List Guidelines ( http://clug.ca/ml_guidelines.php) > **Please remove these lines when replying >
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