The DTR pin allows a target to auto-reset when a new Sketch is downloaded. These pins are known as Data Terminal Ready (DTR) and Clear To Send (CTS). This means that in addition to the RXD and TXD data pins, the FT232RL FTDI module has two more pins used to indicate when it is safe to send data from each side. It is always recommended to use hardware flow control for UART communication. The DTR pin is connected to the reset pin of the microcontroller, which will trigger an auto-reset signal after a sketch is uploaded.įlow control is used to indicate to the other end of the connection that it is safe to send data. There are TX and RX indicator LEDs and you can actually see serial traffic using these LEDs which helps to verify if the board is working. Pins RX, TX, VCC and GND are connected to the corresponding pins of the microcontroller with RX connected to TX and TX to RX.
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