[GreenKeys] An explanation needed

[gil smith]

Hi Jesse:

The short answer:  Each character syncs based on the beginning of the 
start bit -- the receiver times from there to sample the presumed 
center of each bit.  Since the start bit is a Space state, and the 
stop bit is a Mark state, characters may be transmitted with no 
additional delays between them, as the beginning of the Start bit is 
always recognizable by the receiver.

More detail on page 20 of:
http://www.baudot.net/tty-connect/tc-firmware.pdf

gil


At 01:38 PM 10/29/2008, Jesse Hanchrow wrote:
>This is my first submission to Greenkeys,  so please excuse if my 
>format is not correct.
>
>I would like to get an explanation at a very elementary level of how 
>a printer synchronizes with incoming Baudot code.  I would like it 
>to include diagrams of the equipment involved.
>For example, I believe a distributor is used:  if so,  how does it 
>know when to start rotating?
>
>Does it sync.on the Start pulse because the Start pulse's length is 
>greater than the Stop pulse's length and the five information pulses' length?
>
>And I would like a diagram/s showing the mechanical linkage from the 
>electromagnets/solenoids controlled by the information pulses from 
>the distributor that somehow are connected to individual keys.
>
>My above guesswork on how syncing is done may be all wrong but it 
>indicates the level of explanation I would like to get.
>
>I imagine a printer operational manual exists that goes into this 
>kind of detailed explanation but I have not been able searching with 
>Google to find one that can be downloaded,  or any other way I can 
>get an explanation.
>
>Anybody have any suggestions?
>
>Thanks,  Jess Hanchrow
>jessjh at comcast.net
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