[time-nuts] HP Z3805A com port and monitoring questions

John Ackermann N8UR jra at febo.com
Sun Oct 14 09:23:01 EDT 2012


On the unit I bought from fluke.l, with a "Samsung" label, there are two 
serial ports.  The bottom one is the control port and is definitely 
RS-232.  The top port has only three wires (TXD, RXD, SG) and I think is 
used for some sort of monitoring.

I've been using Ulrich's "z38xx" software to monitor it with good success.

John
----

Edgardo Molina said the following on 10/13/2012 10:18 PM:
> Dear Group,
>
> Good evening. I bought two HP Z3805A units a few weeks ago. They were bare units without antenna or power supply. After struggling to find a suitable 24V 3A noise free power supply for each of them, I mounted a couple of Symmetricom antennas and just fired them up.
>
> After around 25 minutes, the GPS Lock light lighted up. As the manual for this particular model is unobtainable in several searches through the Internet, I found that the readily available manual for the Z3801A would cover much of the Z3905A operation. I also got a software for monitoring the operation from BD Systems Inc. In Colorado. Now that I am sure both are operating and locked only by looking at the front panel lights, I would like to ask a couple of questions regarding their communication to the PC.
>
> 1. Is the DB-25 serial port carrying RS-232 signals? I see the port of the Z380A1 is different: RS-422.
> 2. If the port is plain RS-232 is it possible to use a Serial to USB adapter? I have heard about the inconsistencies that such an adapter could cause when used with a TBolt. Should I assume this is the same case with the Z3805A?
> 3. There was once a project for building a TBolt state monitor on a 2 line LCD screen. I own three of those monitors and they are just great.  Is there an equivalent for these HP GPS units?
>
> Any suggestions for the operation of these units and your ever expert and kind advise is always welcome. You all have a nice weekend!
>
> Kindest regards,
>
>
>
> Edgardo Molina
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