Another option if cost is not so sensitive of an issue is to use the TRGpro w/ a
serial CF card. The CF Serial card from Socket
Communications has a DTR and RTS lines that will act in the fashion you want.
Steve
Chris Faherty wrote:
> "Craig Thrall" <[EMAIL PROTECTED]> wrote on 00/02/21 12:55 am:
>
> > The device I need to talk to requires me to make DTR high for 25ms, then
> > low, then RTS high for a specified amount of time, etc. I read that
> > opening and closing the port can flip DTS between +3V and +6V, but I need
> > to control RTS independently of DTR...if it means I have to do a little
> > register manipulation, so be it. :)
>
> Two problems come to mind. The non-standard DTR voltage will more than
> likely not work with your device. The easiest way to work around that is to
> stick a 3V zener diode inline to drop the voltage; I had to do this for my
> cellphone.
>
> Actually maybe I will rethink about the DTR line not being independently
> programmable. I don't recall tracing it back to a signal so I can't say for
> certain whether it is always 6V when the 232 driver is powered. In my
> experience it is, which will lead to your second problem which is that of
> course powering off the driver will leave no signal on the RTS.
>
> I'll tell you that you still have the TXD line that you can use as a general
> purpose I/O -- and in my case that is what I had to use for what sounds like
> a similar project as yours.
>
> --
> /* Scratched & Clawed on a PalmPilot */
>
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