This is a USB to UART conversion board featuring a PL2303GS USB to serial bridge chip, RS/TX/Power indication LEDS and a USB-A connector. We also stock a version with a Micro-USB connector and a USB-C connector. Note: the module is compatible 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 the ATMEGA 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) Package Contents * 1x PL2303 USB UART Board (type A) V2 * 1x 4-pin custom jumper cable (female to female) Resources * Waveshare Wiki (Directs to the USB-C version which works in the same way - no separate Wiki for the USB-A version) https://elecena.pl/product/22725540/pl2303-usb-uart-module-usb-a 2023-03-07 https://elecena.pl/product/22725540/pl2303-usb-uart-module-usb-a 2023-12-27 https://elecena.pl/product/22725540/pl2303-usb-uart-module-usb-a 2024-09-19 https://elecena.pl/product/22725540/pl2303-usb-uart-module-usb-a 2024-11-29 https://elecena.pl/product/22725540/pl2303-usb-uart-module-usb-a 2024-11-30 https://elecena.pl/product/22725540/pl2303-usb-uart-module-usb-a 2025-08-05 https://elecena.pl/product/22725540/pl2303-usb-uart-module-usb-a 2025-11-28 https://elecena.pl/product/22725540/pl2303-usb-uart-module-usb-a 2025-11-29