Hi It looks like (for what ever reason) both of the pins we have called grounds are short pins. The other short pin is a CMOS input that we use to fake the slave present mode.
Bob > On Nov 2, 2014, at 5:36 PM, Tom Miller <tmiller11...@verizon.net> wrote: > > Another mystery - what is on the three short pins? Usually that is done for > hot-plugging things and connects the ground first before the power is > applied. In this case, maybe it is some critical data lines that do not want > dirty signals? I will play some more later tonight. > > Regards, > Tom > > ----- Original Message ----- From: "Bob Camp" <kb...@n1k.org> > To: <gandal...@aol.com>; "Discussion of precise time and frequency > measurement" <time-nuts@febo.com> > Sent: Sunday, November 02, 2014 3:49 PM > Subject: Re: [time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, > Z3810A,Z3811A, Z3812... > > >> Hi >> >> The supplied cable is indeed very short. It’s also quite stiff and a bit >> flakey (intermittent). I would bet at least one cold order of fries that >> there is no bi-directional serial between the two units. If there was, I >> doubt our little pin shorting exercises would get things running. >> >> If there is no serial at all (no GPS data), that makes using the slave for a >> variety of projects quite simple (and thus attractive). One back burner >> TimeNut project is an ensemble clock. >> >> If they are not looking at GPS strings, they are not doing sawtooth >> correction. That is an interesting observation (if true). These boxes have >> roots in the paranoid GPS SA era, so that might not be a big surprise. >> >> Bob >> >>> On Nov 2, 2014, at 3:32 PM, GandalfG8--- via time-nuts <time-nuts@febo.com> >>> wrote: >>> >>> Given the expected close proximity of these units, presumably it was only >>> ever intended that they should work as a pair, and I remember Stu Cobb >>> commenting on how short the supplied link cable is, I wouldn't be too >>> surprised >>> if there turns out to be no serial comms between the units but perhaps just >>> handshaking via asserted levels. >>> >>> Regards >>> >>> Nigel >>> GM8PZR >>> >>> >>> In a message dated 02/11/2014 20:12:35 GMT Standard Time, kb...@n1k.org >>> writes: >>> >>> Hi >>> >>> Yes, getting the GPS version worked out is certainly the thing most people >>> will be after. Doing the other box is a bit further down the road. The >>> main thing (to me) is documenting the 15 pin connector as best we can. That >>> way whatever somebody decides to do in the future, they have a good starting >>> point. Identifying which pins look like RS-422 and which look like CMOS >>> would go a long way to figuring both sides of this out. When I did the other >>> connectors, I just ran through them with a DVM. 2.5V = 422 input, 1.5 or 3.5 >>> = 422 output. I didn’t have any CMOS. Everything else was either open >>> circuit or ground. >>> >>> Bob >>> >>>> On Nov 2, 2014, at 3:01 PM, GandalfG8--- via time-nuts >>> <time-nuts@febo.com> wrote: >>>> >>>> Ah, I had wondered about that but was probably being a bit selfish as I >>> >>>> only have the GPS based units:-) >>>> >>>> Given the similarity, I would assume where we've got to on these >>> wouldn't >>>> be a bad starting point, and at least identifying the 1PPS input on the >>> >>>> interface connector should be straightforward enough. >>>> >>>> Regards >>>> >>>> Nigel GM8PZR >>>> >>>> >>>> >>>> In a message dated 02/11/2014 19:41:07 GMT Standard Time, kb...@n1k.org >>>> writes: >>>> >>>> Hi >>>> >>>> No, once we get the GPS end worked out, we need to do the same thing >>> for >>>> the non-GPS end. If we can fake it into working with just a PPS, it’s >>> the >>>> perfect thing to use to attach an OCXO to a newer GPS (like the Jackson >>> Labs >>>> part …). >>>> >>>> Bob >>>> >>>>> On Nov 2, 2014, at 2:15 PM, GandalfG8--- via time-nuts >>>> <time-nuts@febo.com> wrote: >>>>> >>>>> Hi Gotz >>>>> >>>>> That's great stuff, thank you, I'll try that later. >>>>> >>>>> At this rate we'll soon be finding ways of doing this without any >>>> wiring >>>>> whatsoever, perhaps we could start with just standing it upside down >>> in >>>> a >>>>> dark corner on the night of the full moon:-) >>>>> >>>>> Regards >>>>> >>>>> Nigel >>>>> GM8PZR >>>>> >>>>> >>>>> In a message dated 02/11/2014 17:58:12 GMT Standard Time, >>>> go...@g-romahn.de >>>>> writes: >>>>> >>>>> >>>>> >>>>> Am 02.11.2014 15:08, : >>>>>> Ooh err, whoops, and oh dear !! >>>>>> >>>>>> Arthur, I've only just had a chance to look at your latest photos, >>> and >>>>>> unless I've really got my wires crossed, if you'll pardon the >>>>> expression:-), >>>>>> your links on J5 are not shown on pins 2, 10, 12, and 15, but on >>>> pins >>>>> 4, 6, >>>>>> 11, and 13. >>>>>> >>>>>> As far as I'm aware the numbering from the front of that connector >>> as >>>> >>>>> shown >>>>>> starts in the top right hand corner and every row is numbered right >>> to >>>>>> left. >>>>>> That's certainly how mine are numbered anyway, and I wired them >>>>>> accordingly, and it worked, so where the heck does that leave us >>>> now?:-) >>>>>> >>>>> -------------------------- >>>>> thanks Nigel for detecting this glitch. I removed all jumpers now and >>>>> tested some reasonable new/old combinations resulting in very simple >>>>> scheme: >>>>> it seems to be sufficient to connect pin2 and pin3 to pin8 (ground). >>>>> Numbering as provided by Nigel and markings on my 15 pin-plug. >>>>> >>>>> Götz >>>>> >>>>> _______________________________________________ >>>>> 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. _______________________________________________ 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.
