[ntp:questions] Reasons of NTP not to use GPS source

William Unruh unruh at invalid.ca
Tue Apr 8 21:57:16 UTC 2014


On 2014-04-08, a.everett.000 at gmail.com <a.everett.000 at gmail.com> wrote:
>
> Also, as previously mentioned, simply feeding a 3.3V or 5V pps output from a GPS receiver into a RS232 port will not work as the voltage levels are different. You will need a simple TTL logic to RS232 converter such as a MAX232 device to convert the PPS output signal to the correct voltage level.
>
Actually false form most serial ports these days. While the standard
says 5V the actuallity is that 3,3 V will trigger it on almost all
serial ports. Ie, in general it is a non-issue. Note that the fact that
serial and parallel ports and their interrupts are disappearing from
almost all computer is probably a bigger problem. 



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