Re: Waking up a serial port

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

While looking around inside a 12 volt to 120 volt inverter charger
I noticed a pin header labeled "5v Rx Tx Gnd" near the edge of the
main circuit board.

That sounds more like a USB-A connector pinout:
<https://components101.com/sites/default/files/component_pin/USB-Type-A-Connector-Pinout.jpg>

See if there's any data on the Rx pin.
USB data runs at 12 to 480 Mbits/sec.  What's the maker and model
number of your oscilloscope?  What's the scope bandwidth?

If the connector is USB, the data is differential between the + and -
pins (which may be the Rx and Tx pins).  RS-232 is specified at
+/-15VDC.  It's possible for it to operate at 5VDC.

<https://www.testandmeasurementtips.com/measuring-universal-serial-bus-usb/>

The inverter manufacturers name and model number would also be
helpful.  Good luck.

Begin Mini_Rant()
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Jeff Liebermann                 jeffl@cruzio.com
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