lsusb | grep FTDI :
| Color | Signal | Direction | Typical Use | |--------|--------|-----------|--------------| | | GND | - | Common ground | | Brown | CTS | Input to cable | Clear to Send (hardware flow control) | | Red | VCC (3.3V out) | Output from cable | Power small target (limited current!) | | Orange | TXD | Output from cable | Connect to target's RX | | Yellow | RXD | Input to cable | Connect to target's TX | | Green | RTS | Output from cable | Request to Send (flow control) | ttl232r-3v3 driver
stty -F /dev/ttyUSB0 9600 cs8 -cstopb -parenb : lsusb | grep FTDI : | Color |
import serial ser = serial.Serial('/dev/ttyUSB0', 115200, timeout=1) ser.write(b'Hello\n') print(ser.readline()) : Internally it uses the popular FT232R chip
Here’s a helpful, practical guide to the USB-to-UART cable. Quick Overview The TTL-232R-3V3 is a USB-to-serial (UART) cable from FTDI. It outputs 3.3V logic levels – safe for many microcontrollers (ESP32, STM32, Raspberry Pi Pico, 3.3V Arduinos). Internally it uses the popular FT232R chip. ⚠️ Warning : This is NOT an RS-232 cable. Do not connect directly to legacy RS-232 ports (those use ±12V signals). This is for TTL UART at 3.3V. Connector Pinout (6-pin, 0.1" pitch) Standard color coding (FTDI original cable):