On Nov 2, 2014, at 3:32 PM, GandalfG8--- via time-nuts
<[email protected]> 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, [email protected]
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
<[email protected]> 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, [email protected]
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
<[email protected]> 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,
[email protected]
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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