I have a solar inverter that has a Female RS232 port.
Using a normal RS232 to USB serial Cable with either a CH340 chip or CP210 chip works perfectly fine on a raspberry pi. This confirms that the inverter is following the RS232 standard as far as TX/RX goes Pin2 and Pin3 on the male side.
If I connect the inverter's GND with Arduino and the TX to RX and RX to TX on the Arduino is there a possibility that it would damage the arduino which is 5V or even an ESP32 which is 3.3V?
I'm trying to figure out if a TTL converter is necessary for Serial to serial. Or is it only necessary for USB to serial interfaces ?
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