[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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