On Thu, Jul 25, 2013 at 8:40 PM, John Miles <[email protected]> wrote: > > [email protected] said: > > > Agreed, nobody should be using RS232 for anything nowadays. > > > > RS232 works much better for capturing PPS timing. > > Unless you are watching it with a ring-0 (kernel) driver, and/or using a > hard realtime OS to run the client software, it really won't matter that > much. Anyone running Windows or most flavors of Linux has more to worry > about than the distinction between USB and RS-232, when it comes to > latency.
In just normal UNIX (including Mac OS X) and linux you can see the difference in the log files between USB and RS232. There is three orders of magnitude difference. It's micro vs. milli seconds. But as this filters down to the application level, what are you using this timming informations for? Maybe you have a database and you are time tagging transactions? In that case maybe all you need is tenths of seconds. Who knows? THat is really what needs to be driing this process the end use of the data -- Chris Albertson Redondo Beach, California _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
