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Module parameters: CP2102 module 1.PCB size: 26.5mm*15.6mm 2.PCB color: black 3.Weight: 4g 4.Adopt the new chip CP2102 5.With 3 indicator lights: power indicator, data receiving indicator, data sending indicator, the working status is clear at a glance 6.With 3.3V and 5V voltage two power outputs 7.Bring out all useful pins 8.With reset signal output, you can directly download programs to Promini and other Arduino motherboards! 9.Supported operating systems: -Windows 98/Me/2000/XP/7 -MAC OS-9 -MAC OS -X-Windows CE -Linux 2.40 or higher CP2102 has high integration, built-in USB2.0 full-speed function controller, USB transceiver, crystal oscillator, EEPROM and asynchronous serial data bus (UART), supports full-function modem signals, without any external USB devices. The working principle of CP2102 is similar to other USB-UART conversion circuits. The driver program virtualizes the USB port of the PC into a COM port to achieve the purpose of expansion. Features 1. Contains a USB transceiver, no external circuit is required 2. Contains a clock circuit, no external circuit is required 3. Contains a power-on reset circuit 4. The on-chip voltage regulation can output 3.3V voltage 5. Meets the requirements of the USB2.0 specification 6. The SUSPEND pin supports USB state suspension 7. The asynchronous serial data bus is compatible with all handshake and modem interface signals 8. The supported data format is data bit 8, stop bit 1, 2 and check bit 9. Contains a 512-byte receive buffer and a 512-byte transmit buffer 10. Supports hardware or X-ON/X-OFF HW-409 TXD: Transmitter, generally represented as its own transmitter, normal communication must be connected to the RXD of another device. RXD: Receiver, generally represented as its own receiver, normal communication must be connected to the TXD of another device. During normal communication, its own TXD is always connected to the RXD of the device! Self-