FTDI TTL-232R-3V3 USB to UART Cable User Manual

1. Introdução

This manual provides comprehensive instructions for the FTDI TTL-232R-3V3 USB to UART cable. This cable offers a simple and reliable solution for connecting devices with +3.3V TTL level UART signals to a computer via a USB port. It is designed for engineers, hobbyists, and developers working with embedded systems, microcontrollers, and other serial communication applications.

2. Informações de segurança

• Garantir o volume adequadotage levels (+3.3V) are maintained to prevent damage to connected devices.
• Do not expose the cable to extreme temperatures, moisture, or corrosive environments.
• Avoid bending or twisting the cable excessively, as this may damage internal wires.
• Disconnect the cable from both the computer and the target device before performing any maintenance or modifications.

3. Conteúdo da embalagem

Verifique se todos os itens estão presentes no seu pacote:

• 1 x FTDI TTL-232R-3V3 USB to UART Cable
• (Optional: Driver CD or link to driver download, if applicable. Refer to manufacturer's website for latest drivers.)

4. Produto acabadoview

The FTDI TTL-232R-3V3 is a USB to serial UART (Universal Asynchronous Receiver/Transmitter) converter cable. It provides a USB-A connector on one end and a 6-pin SIL (Single In-Line) connector with 0.1" pitch on the other, offering +3.3V TTL level signals. The cable integrates an FT232R IC, handling all USB signaling and protocols.

Figura 1: FTDI TTL-232R-3V3 USB to UART Cable. This image shows the black USB-A connector on one end and the 6-pin header on the other, with the cable coiled.

4.1 Descrição da pinagem

The 6-pin SIL connector provides the following signals:

Note: The VCC pin (Pin 3) provides +5V from the USB port, which can be used to power external circuitry up to 75mA. The data signals (TXD, RXD, CTS, RTS) operate at +3.3V TTL levels.

5. Configuração

5.1 Instalação do driver

The FTDI TTL-232R-3V3 cable requires specific drivers to function correctly on your computer. These drivers are often automatically installed by modern operating systems (Windows 10/11, macOS, Linux) when the cable is first connected. If automatic installation fails, or for older operating systems, manual installation may be necessary.

1. Baixar drivers: Visit the official FTDI weblocal (www.ftdichip.com/Drivers/VCP.htm) to download the latest Virtual COM Port (VCP) drivers for your operating system.
2. Instale os drivers: Follow the instructions provided with the downloaded driver package. This typically involves running an executable file or following on-screen prompts.
3. Conectar Cabo: Plug the USB-A end of the TTL-223R-3V3 cable into an available USB port on your computer.
4. Verificar instalação:
   • Windows: Open Device Manager (search for "Device Manager" in the Start menu). Look under "Ports (COM & LPT)" for an entry like "USB Serial Port (COMx)", where 'x' is a number.
   • MacOS: Open Terminal and type ls /dev/tty.usbserial*. You should see an entry corresponding to the cable.
   • Linux: Open Terminal and type ls /dev/ttyUSB*. You should see an entry corresponding to the cable.

5.2 Connecting to a Target Device

Connect the 6-pin SIL connector to your target device's UART interface. Ensure correct pin alignment:

• Connect the cable's TXD (Pin 4) to the target device's RXD.
• Connect the cable's RXD (Pin 5) to the target device's TXD.
• Connect the cable's Terra (Pin 1) to the target device's Terra.
• If hardware flow control is used, connect STC (Pin 2) to target's RTS e RTS (Pin 6) to target's STC.
• If powering the target device from the cable, connect the cable's VCC (Pin 3) to the target device's +5V input (ensure the target device can accept 5V and its current draw does not exceed 75mA).

Cuidado: Always double-check the pinout of your target device to avoid damage due to incorrect connections.

6. Instruções de operação

Once the drivers are installed and the cable is connected to your target device, you can use a serial terminal program to communicate.

1. Open Terminal Program: Use a serial terminal application such as PuTTY (Windows), CoolTerm (macOS/Windows), or Minicom/screen (Linux).
2. Selecione a porta COM: In the terminal program settings, select the COM port number identified during driver installation (e.g., COM3, /dev/ttyUSB0).
3. Configure Serial Settings:
   • Taxa de transmissão: Set to match your target device's baud rate (e.g., 9600, 115200, up to 3MBaud).
   • Bits de dados: Normalmente 8
   • Paridade: Nenhum
   • Parar bits: Normalmente 1
   • Controle de fluxo: None, or Hardware (RTS/CTS) if enabled on your target device.
4. Estabeleça conexão: Open the serial connection in your terminal program. You should now be able to send and receive data from your target device.

7. Manutenção

• Limpeza: Use um pano macio e seco para limpar o cabo e os conectores. Não use produtos de limpeza líquidos ou solventes.
• Armazenar: Store the cable in a cool, dry place, away from direct sunlight and extreme temperatures. Avoid tangling the cable.
• Inspeção: Periodically inspect the cable for any signs of damage, such as frayed wires, bent pins, or cracked insulation. Discontinue use if damage is found.

8. Solução De Problemas

8.1 Problemas e soluções comuns

• No COM Port Detected:
  • Ensure drivers are correctly installed (refer to Section 5.1).
  • Tente uma porta USB diferente em seu computador.
  • Reinicie o seu computador.
  • Check the cable for physical damage.
• Sem transmissão/recepção de dados:
  • Verify the pinout connections between the cable and your target device (TXD to RXD, RXD to TXD, GND to GND).
  • Confirm that the serial settings (baud rate, data bits, parity, stop bits, flow control) in your terminal program match those of your target device.
  • Ensure the target device is powered on and functioning correctly.
  • Check if the target device's UART is enabled and configured.
• Conexão intermitente:
  • Check for loose connections at both the USB and 6-pin ends.
  • Evite interferências eletromagnéticas de outros dispositivos.
  • Ensure the cable is not excessively bent or stressed.

9. Especificações

10. Garantia e Suporte

For warranty information and technical support, please refer to the official FTDI website or contact your point of purchase. FTDI provides extensive documentation and support resources for their products.

• FTDI Website: www.ftdichip.com
• Suporte ao motorista: www.ftdichip.com/Drivers/VCP.htm