This is a small USB to UART conversion board featuring a PL2303GS USB to serial bridge chip, RS/TX/Power indication LEDS and a USB-C connector. We also stock a version with a Micro-USB connectorand a USB-A version. Note:the module iscompatible with TTL level only, to avoid damage please do not directly connect to an RS232 circuit. Features PL2303GS onboard Supports windows 7/8/8.1/10/11 3 VCCIO power mode via jumper setting: VCCIO – 5V:5V output VCCIO – 3.3V:3.3V output Open jumper:powered from target board (1.8V/2.5V/3.3V/5V) 3 LED indicators: TXD, RXD and POWER Pinout When working with an MCU such as theATMEGA 328: VCCIO 3.3V or 5V output (the module is powered from USB, the onboard jumper should be shorted to 3.3V or 5V) GND GND TXD MCU.RX (signal direction: MCU.RX << PL2303 << PC.TX) RXD MCU.TX (signal direction: MCU.TX >> PL2303 >> PC.RX) Resources Waveshare Wiki (directs to the Micro-USB version, no separate Wiki for USB-C version but the functionality is the same) Package Contents 1x PL2303 USB UART Board (USB-C) 4-pin custom jumper wire