[time-nuts] Thunderbolt PPS Modification
hmurray at megapathdsl.net
Sun Sep 26 05:27:09 UTC 2010
> Problem 2: Because you connected the TTL-level 1 PPS to the RS-232, you
> may find that not all computers will recognize it. A computer that
> actually followed the RS-232 rules wouldn't see it at all. I don't know if
> any modern computer actually follows those rules.
I've never had any troubles feeding TTL signals to "RS-232" inputs.
I tried the simple wire first. It didn't work, so I guessed that my pulse
wasn't wide enough and built a debugging setup that had a pair of DE-9
connectors with ground, Rx and Tx jumpered across. The DCD pins came out to
a couple of wires so I could easily get at them with clip leads and try
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