[GreenKeys] Computer Questioon

Tue Aug 18 22:01:29 EDT 2015

"Wouldn't be simpler to have comms programs write/read to a soundcard instead of RS232? Or am I missing something here?”  Sometimes I ask myself the same question. 

It depends on what you want to talk to. If your aim is to talk to a computer and be a "console", then you need the RS-232 interface, or you need a program on the computer that translates the audio back and forth to TTY ports (if linux for example) or the com interface if dos/windows. If the computer is a PDP-8 or Altair, then you would have to have a computer in-between translate the audio to RS-232. A beaglebone or raspberry pi or Arduino could do that. But there you are back to rs-232 communication

If you are talking to another teletype, then I would think sound cards would work fine. I have thought skype could be used in this situation for an open channel where two (or more!) people could converse simultaneously. And there is a really neat setup in Germany by a fellow named Henning who does this all with an interchange instead of skype.

Do I have this wrong?
> On Aug 18, 2015, at 4:36 PM, Keith Densmore <ve3gem at gmail.com> wrote:
> 
> Hi All,
> OK I am not the sharpest tool in the shed when it comes to computers. I know just enough to get myself in trouble.
>  
> That said, I have a question.
> It seems that to interface a TTY to a computer you have the following possible contentions.
> 25 pin rs232 now obsolete
> 9 pin rs232 ditto
> usb 2.0 being upgraded to 3.0. Different drivers for different machines,
> Different versions of windows or Linux which affects the above.
> Not all drivers support low speed 45.5 or 50 baud.
>  
> But when you interface through the soundcard you can
> use any soundcard
> use any computer
> support any slow speed desired.
> If someone has gone to the trouble of finding a mechanical TTY you can be pretty sure they have a converter with loop supply.
>  
> ITTY is a great example. I can run it from my laptop or any other computer past or present.
> Wouldn't be simpler to have comms programs write/read to a soundcard instead of RS232? Or am I missing something here?
>  
> Thanks,
> Keith ve3ts
>  
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> Original Message:
> From: simon <simski at dds.nl <mailto:simski at dds.nl>>
> To: <greenkeys at mailman.qth.net <mailto:greenkeys at mailman.qth.net>>
> Sent: 2015-08-16 5:39:41 PM
> Subject: [GreenKeys] A reliable current-loop-to-RS232 converter
>  
>  
> On 16-08-15 02:21, Bob Camp wrote:
> > Hi
> >
> > The fine people “across the sea” will gladly sell you a RS232 <-> TTL converter mounted on a board with connectors.
> > Depending on how picky you are it may or may not cost you as much as lunch at MacDonalds (including shipping over
> > the ocean). If time is critical, the usual suspects here in the US will sell you a slightly fancier version (still fully assembled)
> > for a bit more.
> >
> > Bob
> >
> >
> >> On Aug 15, 2015, at 7:02 PM, drlegendre . <drlegendre at gmail.com <mailto:drlegendre at gmail.com>> wrote:
> >>
> >> To convert the TTL level RS-232 signals to a proper bi-polar signal, you only need a MAX232 chip (or clone) and 4x 1uF @ 16V capacitors. The MAX232 directly converts back and forth between 5V TTL and the more correct +/-12V signaling.
> >>
> >> Easy as pie, and the chips are like a buck or something. Let me know if you need one, I have a couple spares.
> >>
> >> On Sat, Aug 15, 2015 at 3:24 PM, <teletypeparts at comcast.net <mailto:teletypeparts at comcast.net>> wrote:
> >> Justin,
> >>
> >> Thanks for your input. Gabriel's 33 is configured for full duplex, 20MA, 4 wire connection. That's the way I sent it to him unless I made a mistake, but don't think so as the cable on the UCC-6 was already in place and likely was used on a computer before. I just checked the connections and labeled the line cord end. 20MA is easy to check, just look at the large green resistor in the UCC-6 and the left tap should have a wire on it. 60MA, the wire goes to the inside tap. I also tested the machine with a signal generator at 20MA, full dux.
> >>
> >> I don't want to confuse the issue if possible. The 33 should work to a RS-232 adapter. The problem is there are so darn many and they don't have a good track record. I have seen lots of 33 owners struggle with this issue. It almost always came down to the RW-232 adapter.
> >>
> >> Best regards,
> >>
> >> Wayne
> >>
> >>>
> and maybe jump one conversion step with a usb to serial converter like 
> the ftdi or a arduino leonardo with out of the box democode. dx.com <http://dx.com/> and 
> banggood.com <http://banggood.com/> have them in 5 and 3.3v versions
> http://www.dx.com/s/serial+usb <http://www.dx.com/s/serial+usb>
>  
> And take a look here:
>  
> wiki.edwindertien.nl/doku.php?id=modules:telex <http://wiki.edwindertien.nl/doku.php?id=modules:telex>
>  
> Simon (who implemented a version on a Raspberry Pi as the uart can talk 
> any BAUD you like, for example 58baud (dont ask... long story))
>  
> -- 
> Met vriendelijke Groet,
>  
> Simon Claessen
> drukknop.nl <http://drukknop.nl/>
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