FT232RL USB to RS232 Converter (Black, 6-Pin) download cable– Compatible with Windows 7/8/10

The FT232RL is widely regarded as the industry standard for USB-to-serial conversion. It offers superior driver stability across all operating systems, native support without complex driver hunting, and reliable performance at high baud rates . Unlike clone chips that may have driver issues, FTDI provides ongoing driver updates and technical support. The chip also features unique capabilities like the built-in security dongle (FTDIChip-ID™) and integrated clock generator, making it suitable for both development and commercial products .

The FT232RL is a specific package variant of the FT232R. The “L” indicates the 28-pin SSOP package type. Both share the same core functionality—there is no functional difference between the two designations .

Yes. The FT232RL has fully certified drivers for Windows 7, 8, 10, and 11. FTDI maintains current drivers for all modern Windows versions .

For RS232 communication at standard baud rates (up to 115200), cable lengths up to 15 meters (50 feet) are generally acceptable. For higher baud rates or noisy environments, shorter cables (3-5 meters) are recommended to maintain signal integrity.

Yes, within USB limits. The 5V line can provide up to 500mA (standard USB 2.0 specification). The 3.3V output provides regulated 3.3V at lower current (typically 50-100mA). This is sufficient for low-power microcontrollers (Arduino Pro Mini, bare STM32, ESP8266 without Wi-Fi). For power-hungry devices (motors, servos, ESP32 with active Wi-Fi), use a separate external power supply

This converter outputs TTL logic levels (3.3V or 5V), not RS232 voltage levels (±12V). It is designed to connect directly to microcontrollers and TTL-level devices. To connect to true RS232 ports (like old PC serial ports), you need an additional level shifter (e.g., MAX232).

Follow this checklist:

1. Ensure drivers are properly installed (download from FTDI website) .

2. Try a different USB port on your computer.

3. Try a different USB cable—some cables are charge-only and lack data lines.

4. Check Device Manager for yellow exclamation marks .

5. If the device has been previously used, try uninstalling and reinstalling the driver.

6. Test on another computer to isolate the issue.

The easiest method is to let Windows Update handle it automatically—drivers will install when you connect the module . Alternatively, download the “CDM (Combined Driver Model)” from the FTDI website and run the installer as Administrator .

This indicates a driver issue. Right-click the device in Device Manager → Update Driver → Browse my computer → Let me pick from a list → Select the FTDI driver version that matches your OS. If that fails, uninstall the device, restart your computer, and reinstall the driver from scratch.

For initial testing, use these default settings:

• Baud Rate: 115200

• Data Bits: 8

• Stop Bits: 1

• Parity: None

• Flow Control: None

These settings work with most Arduino, ESP32, and STM32 devices .

In Device Manager:

1. Expand Ports (COM & LPT)

2. Right-click “USB Serial Port (COMx)”

3. Select Properties → Port Settings → Advanced

4. Choose a new COM port number from the dropdown list

5. Click OK

Popular applications include:

• Embedded development: Programming Arduino, ESP8266, ESP32, STM32

• Router firmware flashing: OpenWrt, DD-WRT installation and recovery

• Serial console access: Debugging Raspberry Pi and other SBCs without a monitor

• STC microcontroller programming: 51-series development

• Industrial equipment: PLC programming, serial instrument communication

• GPS module interfacing: Reading NMEA data on PC

• Hardware debugging: Monitoring UART output from any embedded device

When uploading code to Arduino boards, the IDE toggles the DTR line. Connecting DTR to the target’s RESET pin through a 100nF capacitor creates a brief LOW pulse that triggers the bootloader. The capacitor is essential—direct connection causes improper timing and upload failures . Many development boards have this capacitor built-in; for bare chips or Pro Mini, you must add it externally.

The LEDs blink only during active data communication:

• At lower baud rates, they blink slowly

• At high baud rates (>115200), they may appear constantly dim or always lit

• If no data is being transmitted, LEDs remain off

• Perform a loopback test (connect TXD to RXD) to verify functionality

Common causes and solutions:

1. Baud rate mismatch—ensure terminal baud rate matches target device (common: 9600, 115200, 57600)

2. Data format mismatch—typically 8 data bits, 1 stop bit, no parity

3. TXD/RXD swapped—swap the TX and RX connections

4. Voltage level mismatch—verify 3.3V/5V setting matches target logic level

5. Ground not connected—ensure GND is connected between devices

This can be caused by:

• Insufficient power—target device drawing too much current from USB

• Driver conflict—another application using the same COM port

• USB selective suspend—disable USB power management in Windows Device Manager

• Loose connection—check USB and target connections

Yes. Connect:

• Converter GND → Raspberry Pi GND (Pin 6)

• Converter TXD → Raspberry Pi RXD (Pin 10)

• Converter RXD → Raspberry Pi TXD (Pin 8)

Do NOT connect the 5V or 3.3V lines—power the Pi separately via USB-C or GPIO 5V. The Pi’s UART uses 3.3V logic, which is compatible with the converter’s 3.3V output .

The FT232RL supports Multi-Protocol Serial Engine (MPSSE) which allows emulation of SPI, I2C, and JTAG protocols. However, this requires custom firmware and specific software support. For most users, standard UART mode (TXD/RXD) is used for programming and debugging .