[time-nuts] Trimble Thunderbolt Start Up RS-232 Communications Glitch

Didier Juges shalimr9 at gmail.com
Thu Sep 6 20:03:34 EDT 2018

Not sure what you refer to. I have made a large number of
microcontroller-based Thunderbolt monitor kits and they do not have that
In any event, a problem like this cannot be the fault of the Thunderbolt,
all it does is send data. It's up to the receiver to process it, including
properly picking up data mid-stream.

As Dave pointed out, if you are using USB-serial adapters and a PC, all
bets are off. There are many substandard devices in that category.
My personal preference is for the Silabs CP210x series and the Chinese
CH340/341. Stay away from the Prolific and FTDI parts unless you know
exactly what you are getting. They have been extensively cloned with
extremely poor quality parts and the legitimate vendors have mangled up
their drivers in order to try and prevent the clones from working with
those (and in some cases intentionally trying to damage the device), the
net result being a total mess of unreliable parts and software.

On Tue, Sep 4, 2018 at 2:56 PM skipp via time-nuts <time-nuts at lists.febo.com>

> Re: Trimble Thunderbolt Start Up RS-232 Communications Glitch
> Hello to the Group,
> Would anyone be able to help provide a bit of insight
> or experience in dealing with what I call the an initial
> Trimble Thunderbolt GPSDO RS-232 communications glitch
> (during initial power on/up).
> I've noticed some of the programs (Lady Heather) and
> external status monitor devices (my own), sometimes
> seem to initially stutter, freeze or even lock up if
> the RS-232 cable connection is made (as one would expect
> to be normal).
> Establishing a working initial power on/up, serial
> port monitor function can require a physical disconnect
> from the GPSDO. Once everything is on, the physical RS-232
> connection can be made and monitor functions operate
> well going forward.
> Would there be a hardware or software "serial comm
> preamble" or power-on sequence, best order of
> operation?  The physical disconnect RS-232 comm
> reset is more than casually inconvenient.
> Thank you in advance for your replies
> Cheers,
> Skipp
> skipp025 at jah who dot calm.
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