Thanks A lot Charlie
--- In "Charles" <> wrote:
>
>
> Hi Enrique --
>
> --- In "enrique_cesena" <enrique_cesena@> wrote:
> >
> > --- In "Charles" <charliem_1216@> wrote:
> > >
> > > Hi --
> >
> >
> > Hi, and Thank You Charlie...
> >
> > > Can you clarify what you mean? I see (3) different possibilities:
> > >
> >
> > Is the third option: current loop serial comm, and yes it's still used in
> > some devices that need long distance comm and isolation protection (in this
> > case is a dispenser machine), as you can see I'm not an expert in
> > electronics.
> >
> > > Really though, any one of these will be hard to do with DIO alone.
> > > RS-232 to current loop converters are (or were) available for the third
> > > option. Analog input will need an A/D converter, and analog output will
> > > a DAC (that you could drive with DIO).
> >
> > There's available options but the most implements rs232 to current loop
> > converters.
>
> It seems to me that RS-232 to current loop converter hardware would be the
> best approach. Why do you think it would not work? To do serial
> communications (either RS-232 or current loop) with bit-banging DIO, you must
> essentially re-invent the whole UART & tty stack from scratch.
I'm for sure that any converter would be ok, but there's some reasons to try
implement the comm "as part" of board, it is possible to connect up to 16
devices, so any solution would be expensive and not able to implement with a
minimum system like TS. In other hand i thought possibly there's some samples
to implement the use of DIO from scratch. Of course always be there the option
of use converter (this option is that I currently use) perhaps I have to start
telling you that, In the past I was using a combination of a Server with SO
installed, with an external RS232 - current loop converter.
Concluding the most important thing here is to reduce space, electronics, and
costs.
Thank you again for all your answers
Regards
Enrique
> >
> > I'm trying to implement if not with DIO alone (sounds impossible to me) but
> > with the minimal implementation of electronics. The question it can be: Is
> > there any diagram or anybody knows how to implement a current loop serial
> > communication using directly the TS DIO? it's ok if is necessary to use an
> > external implementation of electronics (opto-isolator, amplifiers,
> > resistors) including external power for the isolated side.
>
> I've used B&B Electronics for conversion stuff in the past, and I see they
> have an app note about current loop communication:
> http://www.bb-elec.com/bb-elec/literature/tech/curentlp.pdf
>
> regards, ........ Charlie
>
> >
> > Kind of Regards
> >
> > Enrique
> >
> > >
> > > regards, ......... Charlie
> > >
> > > >
> > > > Thanks in Advance
> > > >
> > > > Enrique
> > > >
> > >
> >
>
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