[time-nuts] Z3812 Diag port data? RE: time-nuts Digest, Vol 124, Issue 26

[Bob Camp]

Hi

On my pair of boxes, the slave is the one that is active. The GPS is the one that is inactive (standby). Plugging into the RS-422 / PPS port, I see a pps and a GPS timestamp, and the status bits. That tells me that the slave box *must* be seeing the GPS data strings from the GPS box. 

It still leaves the question of “can you talk back to the GPS from the slave?” open.

My boxes were flakey at first. What I finally figured out was that the interface cable was the weak link. I’d bet that the short pins don’t mate quite well enough with their sockets. After some wiggling all has been ok for a while. 

Bob

> On Nov 3, 2014, at 10:12 AM, Bob Stewart <bob at evoria.net> wrote:
> 
> Hi Bob,
> Talking on J8-Diagnostic port.  All I see on the RS-422 port is a timestamp.
> 
> Bob     From: Bob Camp <kb8tq at n1k.org>
> To: Bob Stewart <bob at evoria.net>; Discussion of precise time and frequency measurement <time-nuts at febo.com> 
> Sent: Monday, November 3, 2014 6:17 AM
> Subject: Re: [time-nuts] Z3812 Diag port data? RE: time-nuts Digest, Vol 124, Issue 26
> 
> Hi
> 
> Ok, on the slave you have, are you talking to the Diag (HP) port or to the RS-422 / PPS (Lucent) port?
> 
> Bob
> 
> 
> 
>> On Nov 2, 2014, at 10:15 PM, Bob Stewart <bob at evoria.net> wrote:
>> 
>> Hi Bob,
>> I am only able to communicate with my system through the REF-0/slave unit.  I had thought this was normal behavior till someone, you perhaps, posted that that was not correct.  So, I've emailed Aecis to request a replacement REF-1.
>> Bob    From: Bob Camp <kb8tq at n1k.org>
>> To: Discussion of precise time and frequency measurement <time-nuts at febo.com> 
>> Sent: Sunday, November 2, 2014 8:20 PM
>> Subject: Re: [time-nuts] Z3812 Diag port data? RE: time-nuts Digest, Vol 124, Issue 26
>> 
>> HI
>> 
>> So at least there is one way communications from the GPS box to the slave box. 
>> 
>> Bidirectional com would be a bit complex given the lack of UART’s on the pc board. I’d bet it just runs through a standard set of messages on the GPS and watches the results. The way to quickly prove I’m wrong would be to issue a command to the GPS from the slave that it must respond to. Something like go into survey mode or set the location to xxx yyy zzz.  I’ve certainly been wrong before. 
>> 
>> I suppose they could do dual source TTL com directly at the GPS module level. I’d think that would drive the GPS unit a bit nuts when the slave started switching things around….
>> 
>> Bob
>> 
>> 
>>> On Nov 2, 2014, at 4:16 PM, n2lym <n2lym at optonline.net> wrote:
>>> 
>>> Yes the diagnostic port on the slave unit diaplay's gps data just like the Z3811. Therefore there must be serial data being exchanged on the 15 pin interconnect.
>>> 
>>> 
>>> Mike
>>> 
>>> N2LYM
>>> 
>>> 
>>> 
>>> 
>>> 
>>> Message: 5
>>> Date: Sun, 2 Nov 2014 15:58:20 -0500
>>> From: GandalfG8 at aol.com
>>> To: time-nuts at febo.com
>>> Subject: Re: [time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A,
>>> Z3810A, Z3811A, Z3812...
>>> Message-ID: <868c5.58494d20.4187f4ec at aol.com>
>>> Content-Type: text/plain; charset="UTF-8"
>>> 
>>> 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
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>> 
>> 
>> 
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> 
> 
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