[time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A, Z3811A, Z3812...
Bob Camp
kb8tq at n1k.org
Sun Nov 2 21:04:11 UTC 2014
Hi
Good point. They could have GPS data simply to make the diag stuff happy, but not use it for the disciplining side of things. I had not considered that possibility.
Others have reported SatStat working on the slave, so there is at least *some* data coming out that port.
Bob
> On Nov 2, 2014, at 3:58 PM, GandalfG8--- via time-nuts <time-nuts at febo.com> wrote:
>
> Just another thought though, does the diagnostic port on the slave also
> communicate with SatStat etc?
>
> That would imply at least a transfer of serial data in one direction, even
> if not for the control functions.
>
> Regards
>
> Nigel
> GM8PZR
>
>
> In a message dated 02/11/2014 20:49:49 GMT Standard Time, kb8tq at n1k.org
> writes:
>
> 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 at 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, kb8tq at 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 at 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,
> kb8tq at 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 at 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,
>>> goetz at 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
>>>>
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