160 baud ALDL data stream format - reference URL?

[Matt S Bower]

Peter Gargano wrote:
> 
> I looked through the archives and found an explanation by Steve
> Ravet (thanks Steve), of the 160 baud ALDL data stream. The diagram
> goes something like this:
> 
>        160 baud data format - 1 bit time
> 
>              S   0        1    S
>          ..__     ........_____    ...
>              |   ^        ^    |   ^
>              V___|........|    V___|..
>             T0   T1  T2   T3   T4
> 
> Time T0 to T4 is 6.25 mSec (ie 6.25 mSec = 1/160 Sec ==> 160 baud)
>      T3 to T4 is minimum of 0.5 mSec
>      T0 to T2 is between 1.5 and 2.3 mSec
> 
> A zero or one bit is determined at time T2 (the  sample time).
> A low voltage is a 1 logic level and a high voltage is a 0 logic
> level for the bit.
> 
> QUESTION:
> 
> I'm not sure what time T0 to T1 is, and I'd like confirmation
> of the other times shown above. Is T0 to T2 really between 1.5
> to 2.3 mSec., I would have expected it to be a bit larger?
> 
Don't remember exactly, not very long, next time I get the system
running I'll scope it.  This is just the start of bit falling edge so
isn't real critical.
The time from T0 to T2 is pretty accurate but has some margin.  This
time is just to tell you about were the center of the sample region is.

> I was also wondering if there is a primary reference URL
> someone may know about that describes the times T0 to T4.
> 

Try this.  The info is a little older but is accurate.
http://www.merlan.ca/seanster/scantool/

> Thanks guys,
> --
> Peter Gargano