[GreenKeys] Asr33: How are BREAK encoded ?

[Steve Garrison]

Hey guys, break is not a character!  It is a lack of current in the loop.  In other words just as if the loop power supply quit.  Nothing should be punched in the tape.  The machine runs open!

The pic of the tape sent earlier looks to me as if the loop current was being randomly turned back on during each punch cycle causing a random pattern of holes to be punched.

Steve G./N4TTY
Sent from my iPhone

> On Feb 20, 2017, at 11:05 PM, Jones, Douglas W <douglas-w-jones at uiowa.edu> wrote:
> 
> 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
> <IMG_0520.JPG>
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