OK, you can test a VP Oncore GPS receiver alone if you have a mean to translate the TTL serial port to a regular RS232 for the PC. This can be done with a MAX232 chip (or equivalent). Then the pinout (refer to the engineering notes previously mentioned, page 9): pin 2 and pin 3 are the main power supply (2: +5B and 3 GND) and the serial port pins are pin 8 TX and pin 9 RX. The TX pin must be routed to the TTL to RS232 translator and then to the RX of the PC (pin 2 if a DB9 is used or pin 3 if a DB25 is used). Pin 9 comes from the translator and from the PC TX pin (pin 3 DB9 or pin 2 DB25). The WinOncore software can be used to test the receiver. Don't forget to connect an external (that is on the roof) GPS antenna and prepare your 'scope for the PPS on pin 6. The PPS should be pretty visible as it is 200mS long (see page 7).
On Mon, Sep 17, 2012 at 11:18 PM, Art Sepin <a...@synergy-gps.com> wrote: > The original VP Oncore Engineering Notes document can be found here: > > > http://www.synergy-gps.com/index.php?option=com_content&task=view&id=35&Itemid=60 > > Unlike later 8 channel UT, UT+ and 12 channel M12+ and M12M timing > receivers, the VP Oncore included an "Idle Mode." If the VP Oncore receives > an @@Cf "Set to Defaults" command, it will remain in Idle Mode until given > a @@Cg command which puts the receiver in Position Mode. The 6 channel > @@Ba or the 8 channel @@Ea command will then produce the Position Message. > The full VP Oncore Command/Reply message set is available here: > > http://www.synergy-gps.com/images/stories/guides/vpcommands.pdf > > Art Sepin > > > ________________________________ > > From: time-nuts-boun...@febo.com on behalf of Hui Zhang > Sent: Sun 9/16/2012 6:38 AM > To: Discussion of precise time and frequency measurement > Subject: Re: [time-nuts] Z3801 Replacement GPS Receiver Card > > > > I just bought a second-hand Z3801A, it also had a error message when self > test - GPS Rcv error, and I saw a red LED on main board on. I want test it > alone but I don't know GPS board's pin define, can someone tell me? Thanks. > > > Hui > > > At 2012-09-16 21:20:26,"Azelio Boriani" <azelio.bori...@screen.it> wrote: > >Anyway, are you sure that the GPS unit is faulty? Can you test it alone? > >The unit is responsive on the serial port? Is the Z3801A sending commands? > >Can you verify with a 'scope on the serial line if there is any signal? > > > >On Sun, Sep 16, 2012 at 2:54 PM, Mike S <mi...@flatsurface.com> wrote: > > > >> On 9/15/2012 2:11 PM, paul swed wrote: > >> > >>> Then respond back with whatever the response might be and then simply > pass > >>> through in both direction whatever comes next. > >>> Could an updated rcvr be used. > >>> Is this init command really the only gotcha? > >>> > >> > >> It's more than just the init command. The z3801a also sends @@Ca, @@Cg, > >> @@Ab, @@Ah, @@Aj, @@Ak, @@Al, @@An, @@Ar, @@Av, @@Ax, @@Ay, @@AB, @@AC, > >> @@AD, @@Ba, @@Bc, @@Bk, @@Cg, @@At, and @@Bn, none of which are > available > >> on an M12 (which would be the logical target if you're going to the > trouble > >> of an adapter), so would need to be converted to other commands, and the > >> correct response returned. In addition, the response to the @@Bb command > >> (Visible sat status) would need modification. > >> > >> > >> _______________________________________________ > >> 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. > _______________________________________________ > 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. > _______________________________________________ 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.
