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  • Yes, that's possible. But you'll need both software and hardware, not only mcu chip, but also rs485 converter. Consider that on many occasions wired connection might be simpler, cheaper and more reliable. Commented Jun 1, 2024 at 13:03
  • Indeed I find internet sources speaking about specific hardware like a RS485 converter that is connected to the ESP. But I don't understand why you need specific hardware for this. In theory the signal is a voltage you can get as input to the pins on the ESP, in your software you can interpret the inputsignals on the pins? Commented Jun 1, 2024 at 13:07
  • rs485 uses relatively high voltage levels, so, no, you can't. If you really wonder you can just grab and read datasheet (e.g. max485) to see what it does and why you can't connect directly. Commented Jun 1, 2024 at 14:34
  • RS485 is 1 of many old standards meant to do different things. RS485 supports multiple drops over 1000+ meters of balanced pair wires designed for electrical noise rejection. Under known / well-understood circumstances, you could probably hack together something simple to allow the ESP processor to listen / decode the RS485 signal. But why take that chance when real RS485 interfaces are cheap & plentiful. Note, you should never (unless specifications state differently) drive a processor input higher then the processor's supply rail. Doing so may lock up or damage the processor. Commented Jun 2, 2024 at 14:40
  • You'll need RS485 to UART conversion modules on both the sender and receiver ESP07 units. dfrobot.com/product-2392.html Commented Jun 13, 2024 at 14:37