[GreenKeys] Asr33: How are BREAK encoded ?

[Keith Lueck]

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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