[GreenKeys] Model 19 on ITTY

Fri Jan 24 17:42:32 EST 2020

Sorry, here's where I got the Evaluation Kit idea from.

http://www.aetherltd.com/connectingusb.html

The github reference is for an integrated solution, a later version that 
is nicely packaged.

John, W9DDD

On 1/24/2020 4:33 PM, John, W9DDD wrote:
> Was that the "CP2102EK USB to UART Bridge Evaluation Kit"  It's 
> available for $29.00 from Mouser and others.  I'm not sure that's the 
> original John Nagle used.
> 
> John's version 3 is documented here?
> https://github.com/John-Nagle/ttyloopdriver
> 
> That evaluation kit reference may just be the starting point of his 
> board development.
> 
> John, W9DDD
> 
> On 1/24/2020 3:50 PM, Steve Garrison wrote:
>> There was, and hopefully still is, a device that John Nagle 
>> recommended (from Silicon Labs) that handles the drop down to 45 baud 
>> from a much higher baud rate.  I wound up with for or five of them, so 
>> I’m set for life I hope!
>>
>>
>> Steve G./N4TTY
>>
>>
>> From: greenkeys-bounces at mailman.qth.net 
>> <greenkeys-bounces at mailman.qth.net> On Behalf Of Paul Heller
>> Sent: Friday, January 24, 2020 1:39 PM
>> To: Al Klase <ark at ar88.net>
>> Cc: GreenKeys at mailman.qth.net
>> Subject: Re: [GreenKeys] Model 19 on ITTY
>>
>>
>> I have found that some of those “dongles” work better than others. 
>> Ones with the prolific PL2303 chipset work better.  But in the past 
>> few years I’ve found that many of the Chinese dongles say they have 
>> the prolific PL2303 chipset but either don’t or have a counterfeit 
>> chipset that does not work.
>>
>>
>> Things used to work but then stopped. Two issues, low speed (45 baud) 
>> and 5 bit, make it a jump ball as to whether a given usb/rs232 adapter 
>> will work
>>
>>
>> This drove me crazy so I ended up using computers with real RS-232 
>> serial ports.
>>
>> Paul
>> W2TTY
>>
>> ITTY:                      HTTP://INTERNET-TTY.NET:8000/ITTY
>> ITTY100:               HTTP://INTERNET-TTY.NET:8010/ITTY100 
>> <http://internet-tty.net:8040/EUROPE>
>>
>>
>>
>> AUTOSTART: HTTP://INTERNET-TTY.NET:8030/AUTOSTART
>> EUROPE:              HTTP://INTERNET-TTY.NET:8040/EUROPE
>>
>>
>>
>>
>>
>> On Jan 24, 2020, at 10:31 AM, Al Klase <ark at ar88.net 
>> <mailto:ark at ar88.net> > wrote:
>>
>>  Virgil,
>>
>> Thanks for your input.  In my experience, these USB to serial dongles 
>> do not support 5-bit data.  I think the USARTS, in the early PC cards 
>> were based on the old Zilog design that could be set in almost any way 
>> by the drivers.  Software like Heavy Metal would work just fine on 
>> these dionsaurs, but not the new dongles.
>>
>> Al
>>
>> On 1/24/2020 10:40 AM, Virgil Bierschwale wrote:
>>
>> you can always add a rs232 board to the computer or use something like 
>> this
>>
>>
>> https://www.amazon.com/RS-232-Serial-Adapter-Windows-64bit/dp/B004WL7MIQ
>>
>>
>>
>> On Fri, Jan 24, 2020 at 9:38 AM Duncan Brown <duncanancy at earthlink.net 
>> <mailto:duncanancy at earthlink.net> > wrote:
>>
>> AL,
>>
>> Are XR-2211 chips still available?  They make a very simple AFSK
>> decoder. It is a 14 pin DIP IC and with a few Rs & Cs will give you an
>> AFSK decoder. (you don't need any limiter or selectivity coming off
>> ITTY) Then just add an optocoupler to interface with the TTY loop.
>>
>> If you you manage to get MMTTY to  output to a serial port, don't worry
>> about ASCII  conversion. MMTTY will output in 5-bit.
>>
>> For a serial port, look for an old Win 7 or XP laptop.
>>
>> Good luck,
>>
>> Duncan
>> K2OEQ
>>
>>
>> On 1/24/2020 09:56, Al Klase wrote:
>>> Hi Ralph, /et al/
>>>
>>> The point is we don't have a TU.  We'll be running a PC anyway if we
>>> monitor ITTY.  Logic level to current loop isn't a problem, and I've
>>> found an Arduino "sketch" that will go from ASCII to baudot.
>>>
>>> I'm exploring RTTYT which looks like it will handle the PC chore.  The
>>> scheme is complicated by the fact that modern PC's don't have RS-232
>>> ports, and the UART's in the USB dongles don't support 5-bit formats.
>>>
>>> 73,
>>> Al
>>>
>>> On 1/23/2020 5:00 PM, Ralph Mowery wrote:
>>>>
>>>> Doesn’t the audio come out of your computer speakers ?   If so you
>>>> could just run that audio into any modem/TU and then to the machine.
>>>> I think that is what I did a year or so back.
>>>>
>>>> Ralph ku4pt
>>>>
>>>> *From:*greenkeys-bounces at mailman.qth.net 
>>>> <mailto:greenkeys-bounces at mailman.qth.net>
>>>> [mailto:greenkeys-bounces at mailman.qth.net 
>>>> <mailto:greenkeys-bounces at mailman.qth.net> ] *On Behalf Of *Al Klase
>>>> *Sent:* Thursday, January 23, 2020 4:40 PM
>>>> *To:* greenkeys at mailman.qth.net <mailto:greenkeys at mailman.qth.net>
>>>> *Subject:* [GreenKeys] Model 19 on ITTY
>>>>
>>>> Gang,
>>>>
>>>> We're still klutzing around with TTY's at the Radio Technology
>>>> Museum, and we're starting to make some progress.  So, how do we get
>>>> data from ITTY out to the machine?
>>>>
>>>> I have MMTTY copying the stream FB, but don't see the hooks to get
>>>> the data out.  Even 8-bit ASCII on a COM Port would be OK, as we can
>>>> use TinyFSK on an Arduino to get to Baudot.
>>>>
>>>> I may just be dense. :-(
>>>>
>>>> Al
>>>>
>>>
>>> -- 
>>> Al Klase – N3FRQ
>>> Jersey City, NJ
>>> http://www.skywaves.ar88.net/
>>
>>
>>
>>
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