[time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A, Z3811A, Z3812A GPSDO system

Anthony Roby aroby at antamy.com
Thu Oct 30 21:17:33 EDT 2014

I was finally able to get my units to lock and behave as described below.  I am still unable to get any data into the PC, either via the RS422 to RS232 hack or through Götz Romahn's modification of the RS422 output.  This issue must be to do with the voltage levels.

I did connect my scope up to the RS422/1PPS output and was able to capture the serial data coming out of that (see the screenshot at http://goo.gl/87e8GG).  I could see two of the numbers incrementing every second, so that must be a timestamp.  I have ordered a USB to RS422 cable, so hopefully that will resolve the issue of communicating via J8.  Thanks Bob for letting me know that the active J8 is on the unit with the green ON light illuminated.


-----Original Message-----
From: time-nuts [mailto:time-nuts-bounces at febo.com] On Behalf Of Bob Stewart
Sent: Thursday, October 30, 2014 2:59 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A, Z3811A, Z3812A GPSDO system

Hi Anthony,
Did you power cycle both units as part of connecting them together at J5 to J5?  And can you remind me whether you are using the supplied interface cable, or are you using something else?  After warmup, the ON light is on for the REF-0 unit and the STBY light is on for the REF-1 unit.  While running, there is no output from J8 on the unit marked STBY.  J8 works on the unit marked ON.  There is a timestamp coming from J6, and I think a 1PPS signal on some pin or other.

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