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FT232RL 3.3V 5.5V FTDI USB to TTL Serial Adapter Module

The USB to TTL serial adapter is based on the high quality and very popular FTDI FT232RL chipset and is an excellent way to connect TTL serial devices to a PC through a USB port.

This USB to TTL serial adapter is ideal for many uses, including:

Programming microprocessors such as ARM, AVR, etc
Working with computing hardware such as routers and switches
Serial communication with many devices such as GPS devices
Serial terminals on devices like the Raspberry Pi
Unlike most USB to TTL serial adapters, this adapter supports both 5V AND 3.3V operation! Simply set the jumper as required to choose between 5V and 3.3V as labelled on the board.

The adapter comes with a right-angle connector fitted allowing you to use it straight away. If you need to access any of the other inputs or outputs of the FT232RL, all the useful signals are provided as through-hole solder pads - ideal for use with straight headers into a breadboard, for example.

The main connector has 6 pins:


  • FT232RL Adapter Module;
  • Chip: FT232RL;
  • USB supply power, can choose 5V or 3.3V interface level;
  • PCB size: 17mm x 32.5mm;
  • Elicit all signal port of FT232RL chip, TTL/CMOS level;
  • RXD/TXD transceiver communication signals indicator light;
  • If need other level, can provide target voltage on VCC and GND pin directly

DTR: Data Terminal Ready - an output used for flow control
RX: Serial data Receive pin
TX: Serial data Transmit pin
VCC: Positive voltage output - this is controlled by the jumper. If the jumper is set to 5V, this will provide a 5V output. If the jumper is set to 3.3V, this will provide a 3.3V output.
CTS: Clear To Send - an input used for flow control
GND: Ground or 0V
For most uses, you can simply connect the following pins:

RX on this board to the TX pin on your device
TX on this board to the RX pin on your device
GND on this board to GND on your device
The VCC pin is ideal for powering small devices such as homemade circuits. This pin should not be connected when a device has a separate power supply as this may damage both devices.

Please note that in 5V mode the maximum current draw on this pin is approximately 500mA. In 3.3V mode the maximum current draw on VCC is approximately 50mA.

There are also several pins available as solder pads. These pins are labelled on the board. Connecting to these pins is not usually required and you should check the FTDI datasheet (linked below) before doing so.

This adapter supports the following operating systems:

Windows 2000 (32 bit)
Windows XP (32 and 64 bit)
Windows Vista (32 and 64 bit)
Windows 7 (32 and 64 bit)
Windows 8 (32 and 64 bit)
Windows 8.1 (32 and 64 bit)
Linux 2.6+
Mac OS X 10.4, 10.5, 10.6, 10.7, 10.8 and 10.9
The drivers can be downloaded from FTDI's website: Download Driver

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