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From: bp@www.zefox.net
Newsgroups: sci.electronics.repair
Subject: Re: Waking up a serial port
Date: Sun, 16 Mar 2025 02:42:54 -0000 (UTC)
Organization: A noiseless patient Spider
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Jeff Liebermann <jeffl@cruzio.com> wrote:
> 
>>Board images are at
>>zefox.net/~bp/ampinvt/2nd_inverter/board_photos
> 
> <https://zefox.net/~bp/ampinvt/2nd_inverter/board_photos>
> The web server or load balancer is returning "Server not found".
> I tried various variations with no improvement.  Please check the URL.

The URL is http://www.zefox.net/~bp/ampinvt/2nd_inverter/
and the pics are in board_photos, _not_ https://.... 
The server does not encrypt connections.

The photos show markings on the board that might be related
to the manufacturer, but I couldn't find any online references.
 
> 
> I need some time to chase the vague references to the possible maker
> of the inverter (Ampinvt and Sigineer).  Got any better info?  Photo?

The inverter is sold by Ampinvt as model HT80112 on Amazon. The idea that 
it's a clone of a Sigineer design is something picked off the web and 
worth no more than I paid for it. The board photos might offer more 
clues, but I couldn't make anything of them.  

> 
> If the inverter was working (strangely), I suspect you might get some
> clues by looking at the output waveform with your oscilloscope (in
> differential mode).  You can do some amazing things with software, but
> trashing the AC output waveform is not one of them.  However, acting
> strangely (whatever that means) is possible.  

The oddity was battery charging behavior, the output behavior seemed
perfectly fine. One LED flashed to indicate charging and should become
steady when charging completed, but instead it kept flashing. Eventually
the LED simply went off permanently, at which point I replaced the unit. 
Far as I could tell the actual battery charging behavior was correct.
It made me think a PID controller might be mistuned, when it went off
that seemed more serious.

There's a jack for an RS485 remote control panel, I was hoping the
apparent serial port might expose configuration parameters if it
runs a Linux kernel with a serial console. 

Thanks for writing!

bob prohaska