[Oberon] File transfer.

[Arnim Littek]

There are plenty of RS232 tranceivers with on-board charge pumps, ref. the original, google MAX232.  Maybe not standards compliant (whatever that means in the RS232/V.24 world) but they work this sort of application that you're talking about.

Arnim

On Mon, 12 Jun 2017 10:47:13 +0200
Tomas Kral <thomas.kral at email.cz> wrote:

> On Mon, 12 Jun 2017 10:39:00 +0200
> Darek Maksimiuk <darek.maksimiuk at gmail.com> wrote:
> 
> > Hi Tomas,
> >   The answer is a  DC-DC step-up  converter:
> >   https://www.pololu.com/category/133/step-up-step-down-voltage-regulators
> >     or
> > https://www.vanallesenmeer.nl/12V-Step-Up/Step-Down-Voltage-Regulator-S10V2F12-Pololu-2096
> > 
> > Cheers,
> >   Darek
> > 
> > 
> > On 12 June 2017 at 10:13, Tomas Kral <thomas.kral at email.cz> wrote:
> > 
> > > On Sun, 11 Jun 2017 21:46:27 +0000
> > > "Skulski, Wojciech" <skulski at pas.rochester.edu> wrote:
> > >
> > > > Tomas;
> > > >
> > > > > Nice drawing. What if I needed h/w flow control for some other
> > > > > non-oberon application. How would the wiring change?
> > > >
> > > > Connect the CTS and RTS to the application which uses these pins.
> > > > In our case the only signals which we need are Tx and Rx. The
> > > > processors can be configured to use the other signals, but then
> > > > you need to dig into the processor manuals and into the details
> > > > of SW drivers. (I do not mean RISC5 here, but rather Blackfin or
> > > > ARM.) The simplest configuration is as shown in the schematics. I
> > > > copied it from Analog Devices years ago and used it ever since.
> > > >
> > > > It works, if the device driver sets the internal processor
> > > > registers the proper way, what all sane device drivers do.
> > > >
> > > > Wojtek
> > > >
> > > > --
> > > > Oberon at lists.inf.ethz.ch mailing list for ETH Oberon and related
> > > > systems https://lists.inf.ethz.ch/mailman/listinfo/oberon
> > >
> > > I wish to know,
> > > What the trick is, making +/-12 from +5V?
> > >
> > > --
> > > Tomas Kral <thomas.kral at email.cz>
> > > --
> > > Oberon at lists.inf.ethz.ch mailing list for ETH Oberon and related
> > > systems https://lists.inf.ethz.ch/mailman/listinfo/oberon
> > >
> 
> Hi,
> 
> Thank you, you may have noticed from my questions, I am not a real h/w
> man, only a hobbyist. The reason I ask, that some low cost usb-rs232
> adapters, do not produce +/-12V, but some +/-6V relying on broad
> tolerance band. But while they may work on modern systems, they may
> bot be reliable on some legacy systems with old serial ports. 
> 
> I am also thinking of some PIC application, as that is also on my list
> to build a programmer and learn PIC assembly, and if possible do tests
> on serial converter application.
> 
> -- 
> Tomas Kral <thomas.kral at email.cz>
> --
> Oberon at lists.inf.ethz.ch mailing list for ETH Oberon and related systems
> https://lists.inf.ethz.ch/mailman/listinfo/oberon


-- 
Arnim Littek <arnim at actrix.gen.nz>