Re: Waking up a serial port

HW <none@no.no> wrote:

On Sat, 15 Mar 2025 17:30:03 -0000 (UTC), bp@www.zefox.net wrote:
 

Are there any customary tricks to making a diagnostic serial port
active?

 
I am not aware of any standards.
 
Some devices will respond to a few CR-LF, as in pressing the enter key
a few times, but those are probably mostly intended to be accessible
by the user.
 
A device like this may very well have the serial port disabled in
firmware.

I did briefly try to connect a usb-serial adapter, hoping to see at
least garbled boot messages during power up by varying baud settings.
Nothing at all appeared on the terminal screen. That's when I tried
the 'scope and found nothing.

There are some board photos at
http://www.zefox.net/~bp/ampinvt/2nd_inverter/board_photos/
Please note it's http:..., not https. You'll have to pacify
your browser if it doesn't like unencrypted connections.

Thanks for replying,

bob prohaska