I’ve been running a GPS with NMEA and PPS outputs connected to a server with a DB25 serial port. The PPS is wired to the DCD pin with the type 20 generic NMEA driver. The new server that I would like to connect the GPS to has a Cisco/Sun type RJ-45 serial port that lacks the modem control pins. I can’t find any documentation that mentions using DSR for the PPS. Is there a reference clock driver that will recognize the PPS on a flow control pin?
What OS?
If you are using linux you can use GPSD which I believe supports PPS on alternate pins. Then you use a SHM refclock with NTP to talk to GPSD.
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Nothing to do with gpsd, as PPS handling it done at the kernel level.
I personally just ended up buying a cheap PCIe serial (or parallel!) card from Amazon and using that.
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This is a Sun/Oracle server running Solaris.
I did a little digging around and @jailbird is right, this is implemented in the kernel (timepps.h which is used by NTP merely interfaces with it).
I would have to agree, easiest route without making a ton of headaches for yourself would be to simply drop in a serial port card that has a chip solaris supports and connect to the DCD pin.
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Thanks for the info. I’ll take a look at adding serial hardware.