Re: Waking up a serial port

legg <legg@nospam.magma.ca> wrote:

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. This piqued my curiosity, so I connect a 'scope
to the Tx pin and Gnd, then tried power-cycling the inverter a few
times. Several power cycles later I could find no hint of a signal
anywhere near the usual 9600 baud rate that I believed customary.
>

 
Inverter/chargers are often provided with a basic communications
method, if only to turn off and on remotely.
 
These can use any com hardware or protocol mixed and matched
to do the job - usb sockets spouting rst232, network connectors
doing the same.

This unit has a socket for connecting an RS-485 remote panel.
Far as I can gather it merely duplates the function of the
built-in panel, a five-button affair with one power button
plus four: (up, down, enter, back). It's not clear how to tell
if it's active, nor how to communicate if it is. Surely the
manufacurer won't help... Any ideas are welcome!

Thanks for writing,

bob prohaska