RS232 isolation #3
https://www.barbouri.com/2022/03/31/isolated-ttl-serial-to-usb-2-0-converter/
https://www.barbouri.com/2022/03/31/isolated-ttl-serial-to-usb-2-0-converter/
GTL-POWER-B0505S (Eleparts, Aliexpress) 전류-출력(최대): 200mA 출력 수: 1 기능: DC-DC 전압-출력: 5V 전압-입력: 4.5V ~ 5.5V 출력구성: DC-DC Isolated Module