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

[GandalfG8 at aol.com]

Bob
 
It's possible that what you're seeing might well be normal  operation when 
they're operating as a pair, since Ref-0, what we've  been calling the slave 
because it has no GPS receiver, is actually the default  "master" in 
operational terms.
 
I only have Ref-1 units operating stand alone so perhaps someone  else with 
an operational pair can confirm whether or not any routine  communication 
exists with Ref-1 once the boot up sequence is finished?
 
In particular, when you say you can't communicate are you referring to the  
J6 RS422/1PPS port, the J8 diagnostic port, or both?
 
A good test might be to set up your Ref-1 to operate stand alone.
Remove the interface cable and just fit two links to the Ref-1 J5  
diagnostic connector, pin 2 to 8 and pin 3 to 13, and then power it up as  normal.
It won't be outputting 15MHz and 1 PPS until the "fault"  light goes off 
and the "on" light is on, but you should be able to  communicate with the J8 
diagnostics port as soon as it's powered up.
I've used SatStat and other HP series Z3xx compatible software and  all 
worked fine, and that should continue after the boot up period  ends and the 
outputs are enabled.
I haven't so far tried the J6 RS422 port with the Lucent software as I've  
been more interested in the GPS side of things and didn't want to dig into  
the box itself before I've had time to study the RFTG-m manual re the 
software  commands and better understand the implications.
 
Regards
 
Nigel
GM8PZR
 
 
In a message dated 03/11/2014 03:16:35 GMT Standard Time, bob at evoria.net  
writes:

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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