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Introduction This PL2303 Mini USB to UART board is a converter module which is a perfect choice when you want to use a serial port for a module that lacks the function. It includes a powerful converter PL2303 and 3 indicator LEDs and connects to other modules with a mini USB port. Pin Description TXD: Transmitting terminal of the converter module, normally connected to RXD of another device RXD: Receiving terminal of the converter module, normally connected to TXD of another device GND: ground, connected to GND VCC: 5V output; if you connect a 3.3V device, you need to use a power adapter to step down voltage DTR: Data Terminal Ready, active low CTS: Clear To Send, active low Package included: - 1 * PL2303HXD Module