Hi The only serial dialog between the two units is a repeat of the output of the GPS module. My guess is that there is some subtle difference between the Oncore data and they skytraq….
Bob > On Feb 6, 2017, at 1:23 PM, Thomas Petig <tho...@petig.eu> wrote: > > Hi everyone, > I am currently trying to repeat previous work of members of this list in > convincing the REF 0, to run standalone with a given 1PPS signal from a > gps. Similar to: > https://syncchannel.blogspot.se/2015/08/standalone-operation-of-lucent-ks-24361.html > > I am using a skytraq gps with 100ms, 74AC04 for inverting and level > shifting and I added the jumper wires on J5. I simulate the Oncore > messages with a python script using a usb->uart cable and triggering on > the 1PPS pulse on the CTS line. I am sending @@Ea, @@En, @@Bb, @@Ap, > @@Aw, @@Ag, @@At, @@Az, @@Bj, @@Bo with a delay of 75 ms, as suggested > in the blog above: > https://github.com/thpe/oncore/blob/master/oncore_emu.py > > Surprisingly, I have a constant delay of 0.8 ms, and only a jitter of > +/-0.1 ms for the oncore messages compared to the pulse on the CTS line. > > Short everything is working and if I force external 1PPS usage it locks > to it (NO GPS light goes off). Using pForth: > 1 force_ext_1pps > 1 force_gps_1pps > > But, it does not do it on its own, since it ignores the tracking mode > for the satellites and, I guess after reading the Z3801A manual, > therefore it claims the GPS 1PPS signal as invalid. E.g., for the entry > with @@Ea: > 0x02, 0x08, 0xFF, 0x82 > meaning satellite 2 in mode 8 (used for positioning) it assumes mode 0. > The other values, like signal strength 0xFF and channel status 0x82 are > taken, even if I change them to something else. The mode value is > ignored no matter what it says. > > In the attached files on sees that "GPS 1PPS Invalid: not tracking", and > the mode of the is 0. I forced it to use the external 1PPS signal. > > So, the question what tiny detail did I miss while reading the mailing > list archive and those blogs on how to set the REF 0 up for standalone > operation just using the Oncore messages? > > Does someone has dump of the communication between REF 1 and > REF 0, until the REF 0 is happy (I don't have a REF 1)? > > Regards, > Thomas > DK6KD > SA6CID > <pstat.txt><print_stat.txt>_______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
