Serial Port API

The API used still hang onto the RS232 signals.

• https://pinoutdiagrams.com/cable/rs232-null-modem-cable-pinout

Some API documents for windows and Linux.

• http://en.wikibooks.org/wiki/Serial_Programming/termios

• https://learn.microsoft.com/en-us/windows/win32/api/

• https://learn.microsoft.com/en-us/windows/win32/cimwin32prov/win32-serialport

• https://learn.microsoft.com/en-us/uwp/api/windows.devices.serialcommunication.serialdevice?view=winrt-26100 - Windows

• https://en.wikibooks.org/wiki/Serial_Programming

• https://en.wikibooks.org/wiki/Serial_Programming/termios - Linux

• https://tldp.org/HOWTO/pdf/Serial-Programming-HOWTO.pdf

Using Web_serial to do RS232 to a Modem.

https://developer.mozilla.org/en-US/docs/Web/API/Web_Serial_API

http://ccgi.dougrice.plus.com/cgi-bin/wiki.pl?AT_Commands_-_Serial_Using_Web_Browser