[GreenKeys] Asr33: How are BREAK encoded ?

[Julien Scrofani]

Hi guys,

I correct what I said previously : it is the unpunched lines between the
punched ones on my paper tape which are interpreted by my loop adapter as
BREAK signals.

Bests regards,
Julien

Le mar. 21 févr. 2017 à 20:10, Julien Scrofani <julien.scrofani at gmail.com>
a écrit :

> From your answers, I understand that it's because of the taped garbage
> characters, which are encoded when I release the BREAK key, that my adapter
> is able to recognise them and send them to my terminal.
>
> Julien
>
> Le mar. 21 févr. 2017 à 19:41, Wayne Durkee <teletypeparts at comcast.net> a
> écrit :
>
>
>
>
>
>
>
> Keith,
>
> Thanks for that reminder of the TWX Break button. It stops the tape at the
> sending TWX. I cant remember but it was on the cover plate right?
>
> The AB drum was coded in both ASCII and Baudot machines for TWX and Telex
> with an abbreviation of the machines business name and city it was in.
> Uncoded as most computer 33's were it will give you a tape leader of 20
> blanks or nothing punched but the feed wheel.
>
> If you are using a 32 for RTTY, you should disable the vertical pawl that
> allows the machine to start the AB 20 character function. If you are
> receiving garble and catch a FIGS D, the AB will trip and the next 20
> characters will be garble even if the received garble has stabilized.
>
> Wayne
> KB1FDW
>
>
>
>
> On February 21, 2017 at 1:09 PM Keith Lueck <kwlueck at swbell.net> wrote:
>
> According to the BSP that Don House provided to me, the 101C dataset
> converted the break signal into a ~200 msec spacing tone (regardless of how
> long the "BREAK" key is pressed) which interrupts the transmission of
> characters at the sending end.  At the sending end, the "BRK RLS" light
> goes on, and transmission is stopped until "BRK RLS is pressed...
>
> Keith
>
>
> ------------------------------
> *From:* Wayne Durkee <teletypeparts at comcast.net>
> *To:* GREENKEYS BULLETIN BOARD <greenkeys at mailman.qth.net>; "Jones,
> Douglas W" <douglas-w-jones at uiowa.edu>; Julien Scrofani <
> julien.scrofani at gmail.com>
> *Sent:* Tuesday, February 21, 2017 11:41 AM
> *Subject:* Re: [GreenKeys] Asr33: How are BREAK encoded ?
>
> I am not a computer guy, but Break is something used with your computer,
> not the Teletype although TWX machines had a Break key, but I have
> forgotten what it was for.
>
> Wayne
>
>
>
> On February 21, 2017 at 6:31 AM Julien Scrofani <julien.scrofani at gmail.com>
> wrote:
>
> Hi guys,
>
> Thank you for your responses.
>
> The start and stop units are not parts of the punched code on the tape,
> right ?
> How then, when I read the tape, does the adapter convert these sequences
> into BREAK sequences ?
>
> Julien
>
> Le mar. 21 févr. 2017 à 05:05, Jones, Douglas W <douglas-w-jones at uiowa.edu>
> a écrit :
>
> From: Julien Scrofani [julien.scrofani at gmail.com] Monday, February 20,
> 2017 2:09 PM
>
>
>
> > I taped several BREAK sequences with the tty puncher, pressing my finger
> more or less time on the key.  The punched codes differ a lot (see pic).
> When I read the tape, toward my terminal via the usb current loop adapter,
> all BREAK are correctly converted.
>
> Are they coded with several bits patterns ? If not, how are they
> interpreted correctly by the adapter ?
>
>
>
> The adapter recognizes break by the lack of a stop bit at the end of the
> character, not by the bit pattern.
>
>
>
>                 Doug Jones
>
>                 jones at cs.uiowa.edu
>
>
>
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