Hi > On Nov 6, 2014, at 3:44 AM, GandalfG8--- via time-nuts <[email protected]> > wrote: > > Hi Paul > > Prime question is what are you calling the "slave" unit?
1) Slave in the sense that it’s slaved to the GPS in the other box. Unless we find a serial link from the Ref-0 back into the Ref-1, that’s all it’s doing. 2) It fires up and the Ref-1 box gets all organized and locked up. It goes “ok” first, then the Ref-0 goes “ok” (locks to GPS). In that sense, the Ref-1 is the master. My guess is that they default to output from the Ref-0 rather than Ref-1 because it’s the one more likely to fail (more single points to go wrong). > In normal use Lucent treats the Ref-0 unit as the master and Ref-1 as the > slave, but it's Ref-1 that contains the GPS module. Bit confusing Yes it is confusing - sorry about that > but if > you've got Ref-1 with the GPS module then you're in business:-) > > It's turned out the transistor delay circuit isn't needed after all and the > wiring can be simplified too. > > All that's necessary to run the Ref-1 stand alone is to ground pins 2 and 3 > on the J5 interface connector and there's a couple of convenient ground > pins already on that connector, 8 and 13. > In normal use pin3 is tied hard to ground, presumably via direct link from > the other module, so that can just be a wire link to either pin 8 or 13. > Pin 2 is normally held at a logic low level so although a direct ground > seems to work ok for that too, and no damage noted so far, I prefer to play > it safe and ground that one to the other ground pin via a 470ohm resistor, > which also works fine. > That's it. So a single 15 pin connector with one jumper and one resistor (or jumper) plugged into the interface socket. > > The LEDS should flash at start up, followed by "No GPS" and "Fault" on > solid whilst the unit goes through acquisition and lock, this can take an > hour > or so, and then those LEDs should go off and the "On" light should be > solid. > At this point the 15MHz and 1PPS outputs are enabled. > > The J8 diagnostics connector is enabled from start up and SatStat can be > used to monitor progress. > The RS422 3 wire fudge suggested by Stu Cobb works fine for me, J8 pin 7 to > PC 9 way comm port pin 5, J8 pin 8 to comm port pin 3, J8 pin 9 to comm > port pin 2. Works, but if you have an old style +/- 12 V RS-232 signal, things might or might not work forever. A lot depends on how they have protected the chips. They expect a 1.5 to 3.5V signal on the input, so even +/-5 is a bit exciting. Full blown RS-422 interfaces are sub $15 gizmos. Bob > > Regards > > Nigel > GM8PZR > > > > In a message dated 06/11/2014 01:24:33 GMT Standard Time, > [email protected] writes: > > I have been following the threads on the KS-24361 some of the longest I > have ever seen on time nuts. > So I have a very basic question. > There was a 2 transistor delay circuit by Arthur way back. I believe this > is needed. > But then the pin numbers seem to get a bit mixed up and there are some > jumpers with several comments. > Is there a clear guidance on what to do? I do not have the slave unit. > Power is not an issue. > Thanks in advance for your help. > Must say the units very nice. > > Regards > Paul > WB8TSL > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
