아두이노 HW 구성 RS485 softwareSerial(3, 2); RS485_CONTORL_PIN 4 arduino-modbus-rtu-tcp-gateway Source Code https://github.com/budulinek/arduino-modbus-rtu-tcp-gateway Library https://www.arduino.cc/reference/en/libraries/circularbuffer/ 아두이노에 적용됨 Github rionkim54/arduino-modbus-rtu-tcp-gateway (github.com) 테스트용 소프트웨어