ETON USB TO SERIAL ADAPTER DRIVER SERIAL
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.
CTS – Clear to send (Input used for flow control).DTR – Data Terminal Ready (Output used for flow control).The FTDI USB to TTL serial converter module has 6 male header pins which are breadboard friendly and 18 through-hole connectors. It has a 3.3/5V DC selection jumper and supplies 500 mA through its VCC pin. The module has a mini-B USB port which is used to connect to a USB port of an interfaced device like a computer. It is a breakout board for the FTDI FT232R chip with a USB interface, can use 3.3 or 5 V DC and has Tx/Rx and other breakout points. The FTDI USB to TTL serial converter module is a Universal Asynchronous Receiver-Transmitter (UART) board used for TTL serial communication. The FT232RL IC is used to convert USB signals to UART signals which facilitates communication with and upload code to microcontrollers like Arduino, STM32 and ESP-01 without the need for an external programmer.
FT232RL FTDI USB to TTL serial converter modules are used for general serial applications and popularly used for communication to and from microcontroller development boards such as ESP-01s and Arduino micros, which do not have USB interfaces to computer via a USB mini port and for flashing STM32 bootloader.