DSD TECH SH-U09C USB to TTL Serial Adapter User Manual

1. Introduction

The DSD TECH SH-U09C is a USB to TTL serial adapter designed for reliable communication between your computer and various microcontrollers or embedded systems. Featuring the genuine FTDI FT232RL (or FT232RNL) chip, this adapter ensures high stability and broad compatibility across multiple operating systems. It provides flexible voltage output options (3.3V and 5V) and includes LED indicators for transmit (TX), receive (RX), and power, aiding in debugging and data transfer processes.

Figure 1: Top and bottom view of the DSD TECH SH-U09C USB to TTL Serial Adapter, showing the USB-A connector and the pin header.

2. Key Features

• High-Speed Communication: Supports maximum transmission speeds up to 3Mbps.
• Genuine FTDI Chip: Utilizes the FT232RL or FT232RNL chip for high stability and reliable performance.
• LED Indicators: Equipped with LED indicators for TX (transmit), RX (receive), and Power, useful for debugging and monitoring data flow.
• Selectable VCC Output: Supports both 3.3V and 5V VCC output, switchable via a jumper, to match the voltage requirements of your target device.
• Broad Operating System Compatibility: Works with Windows 11, 10, 7 (32/64bit), Vista, 2008, XP, 2003, and Mac OS.
• Pin Definitions: Includes standard pins: CTS, RTS, RXD, TXD, GND, VCC.

3. Package Contents

• 1 x DSD TECH SH-U09C USB to TTL Serial Adapter
• 1 x 6-pin Jumper Wire (Female-to-Female)

Figure 2: The DSD TECH SH-U09C USB to TTL Serial Adapter, jumper wires, and included documentation.

4. Setup and Driver Installation

4.1 Driver Installation

The DSD TECH SH-U09C adapter uses a genuine FTDI FT232RL or FT232RNL chip. Most modern operating systems, including Windows 10, Windows 11, and recent versions of Mac OS and Linux, will automatically install the necessary drivers when the adapter is first connected to a USB port. If automatic installation does not occur, or if you encounter issues, you can manually download the latest FTDI VCP (Virtual COM Port) drivers from the official FTDI website (ftdichip.com/drivers/vcp-drivers/).

• Windows: Download the appropriate VCP driver for your Windows version (32-bit or 64-bit). Follow the installation instructions provided by FTDI.
• Mac OS: Download the VCP driver for Mac OS. Installation typically involves running an installer package.
• Linux: FTDI VCP drivers are usually included in the kernel. If not, consult your distribution's documentation or the FTDI website for specific instructions.

Figure 3: The SH-U09C adapter is compatible with various operating systems.

4.2 Connecting the Adapter

1. Connect to Computer: Plug the USB-A connector of the SH-U09C adapter into an available USB port on your computer. The power LED on the adapter should illuminate.
2. Identify COM Port: After driver installation, the adapter will appear as a Virtual COM Port (VCP) in your computer's Device Manager (Windows) or /dev/ttyUSBx (Linux/Mac OS). Note the assigned COM port number for use with your serial terminal software.
3. Connect to Target Device: Use the provided jumper wires to connect the appropriate pins of the SH-U09C to your target microcontroller or device. Ensure correct pin mapping (TX to RX, RX to TX, GND to GND, and VCC if powering the device).

5. Pin Definition and Voltage Selection

The SH-U09C adapter provides a 6-pin header with the following definitions:

• VCC: Power output (selectable 3.3V or 5V)
• GND: Ground
• TXD: Transmit Data (output from adapter, connects to RXD of target device)
• RXD: Receive Data (input to adapter, connects to TXD of target device)
• RTS: Request To Send (flow control)
• CTS: Clear To Send (flow control)

5.1 VCC Voltage Selection

The adapter features a jumper to select the VCC output voltage between 3.3V and 5V. Ensure the correct voltage is selected before connecting to your target device to prevent damage.

• To select 5V VCC output, place the jumper on the pins labeled "5V".
• To select 3.3V VCC output, place the jumper on the pins labeled "3V3".

Figure 4: Pin definitions and VCC voltage selection jumper on the SH-U09C adapter.

6. Operating Instructions

Once the drivers are installed and the adapter is connected to your target device with the correct voltage selected, you can begin serial communication using a terminal program on your computer.

1. Open Terminal Software: Launch your preferred serial terminal software (e.g., PuTTY, Tera Term, CoolTerm, Arduino Serial Monitor).
2. Configure Port Settings:
   • Select the COM port identified in Device Manager (e.g., COM3, COM4, /dev/ttyUSB0).
   • Set the Baud Rate to match your target device's serial communication speed (e.g., 9600, 115200).
   • Configure Data Bits, Parity, and Stop Bits (commonly 8 data bits, no parity, 1 stop bit).
   • Set Flow Control (usually "None" unless your application requires RTS/CTS).
3. Establish Connection: Open the serial connection in your terminal software.
4. Monitor and Transmit Data: You should now be able to send and receive data from your target device. The TX and RX LEDs on the SH-U09C adapter will flash during data transmission and reception, respectively.

Figure 5: The TX and RX LEDs on the SH-U09C adapter indicate data activity.

7. Maintenance

• Keep the adapter in a dry environment, away from moisture and extreme temperatures.
• Avoid physical shock or dropping the device.
• Do not attempt to open the clear casing, as this may damage internal components.
• Clean the exterior with a soft, dry cloth if necessary. Do not use liquid cleaners.

8. Troubleshooting

• Adapter not recognized:
  • Ensure the adapter is fully plugged into the USB port.
  • Verify that the FTDI drivers are correctly installed. Check Device Manager (Windows) for any yellow exclamation marks.
  • Try a different USB port or computer.
• No data transmission/reception:
  • Double-check your wiring connections, especially TXD to RXD and RXD to TXD.
  • Confirm that the VCC voltage jumper is set correctly (3.3V or 5V) for your target device.
  • Verify that the baud rate and other serial port settings in your terminal software match those of your target device.
  • Ensure the target device is powered on and functioning correctly.
  • Check the TX/RX LEDs on the adapter; they should flash when data is being sent or received.
• Intermittent connection:
  • Ensure all connections are secure.
  • Avoid using excessively long jumper wires, which can introduce noise.
  • Check for electromagnetic interference from other devices.

9. Specifications

Figure 6: Dimensions of the SH-U09C adapter.

10. Warranty and Support

DSD TECH provides permanent technical support for this USB to TTL Serial Adapter. Additionally, a 1-year product replacement service is offered. All customer inquiries are typically answered within one working day. For technical assistance or warranty claims, please contact DSD TECH customer support.