[time-nuts] z3801a - serial help and for sale.

Scott McGrath scmcgrath at gmail.com
Wed Jun 10 16:50:51 EDT 2015

Try going through all the speeds starting at 300.  Sounds like a baud rate mismatch to me from the symptoms 

Also try 8 bits 1 stop no parity 

Content by Scott
Typos by Siri

> On Jun 10, 2015, at 10:28 AM, David Andersen <dga at pobox.com> wrote:
> I'm throwing my hands up in the air - I don't have the time to wrestle my
> silly mac into trying to talk to the box, unless someone has quick advice
> on something I might be doing wrong.
> z3801a, jumpered to RS232, modified with an internal switching power supply
> (see photos below).  Power light comes on, unit is outputting stable
> 10MHz.  Doesn't GPS lock, but that makes sense, since I haven't been able
> to issue a SURVEY command and I don't live where I used to.
> The internal green status light is blinking (as normal), suggesting that
> it's probably happy and I'm an idiot for not being able to make it work,
> but I don't vouch for anything about it past the 10mhz being there.  The
> double-oven oscillator is clearly happy given the 10mhz (compared against a
> working Thunderbolt).
> Hooked up a serial cable at 19200, 7, O, 1, but only got a garbled little
> prompt back - no response to standard z3801a commands.  I *think* I have
> the cable configured properly.  I opened it up and checked the RS232
> jumpers and they're correct.
> I'm open to advice on getting the serial working under my Mac or Linux, or
> anyone who wants to relieve me of the burden of z3801a ownership and take a
> risk that it's a fixer-upper. :-)  I suspect that in some previous life, I
> switched it over into a binary mode of some sort while using it to sync
> something, but I can't for the life of me remember what I might have done.
> Some reasonable price plus shipping and it's all yours... I'm trying to
> de-clutter in preparation for a sabbatical on the other side of the country.
> Pictures:
> https://www.dropbox.com/s/ursszjgie8m1xj8/2015-06-09%2011.57.16.jpg?dl=0
> https://www.dropbox.com/s/it8d2f65ztn4rkq/2015-06-09%2011.57.24.jpg?dl=0
> https://www.dropbox.com/s/1p1g6xrapzdmvzh/2015-06-09%2011.59.56.jpg?dl=0
> Thanks!
>  -Dave
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