Re: GPS time sync with chrony and ESE serial device

[David J Taylor]

David, what I'm gathering from your last email is that I might try re-doing 
the pin configuration of the serial cable, to see if that is why the PPS 
programs don't recognize it.  Is that a fair statement?  I'm getting the 
feeling that the existing pin configuration is very non-standard.  I'm also 
willing to try "reference NTP" in place of chrony, but I'm not very 
interested in Windows. :)  I might try some of these things next week when I 
have time.

Thanks again,
Devren
=============================================

Devren,

I would check with a 'scope what pin carries the PPS signal, and send that 
to the DCD line of the computer end.  That would be what I understand to be 
the "standard" configuration.  Maybe chrony uses the same, but I can't say.

When connecting to GPIO pins be aware that some are 0..3.3V, and sending 
standard RS232 levels (-12V..+12V) may damage GPIO ports beyond repair. 
Also be aware that "3.3V" GPS signals may be too low a voltage to be 
recognised by "standard" RS232 ports expecting +/- 12V!

I wrote a program to display the DCD line, but it runs on Windows.

 https://www.satsignal.eu/software/net.htm#SerialPortLEDs

Cheers,
David
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