You likely installed the parallel (printer) driver instead of the serial driver. Uninstall and reinstall CH341SER.EXE specifically.
| Issue | Solution | | :--- | :--- | | | • The driver is likely not installed. Re-download and reinstall the CH340 driver. • Try a different USB port or a different USB cable. Some cables are charge-only and don't carry data. | | Device has a yellow exclamation mark | • The driver is corrupted or incorrectly installed. • In Device Manager, right-click the device and select Update driver > Browse my computer for drivers > Let me pick from a list... . Select the "USB Serial Converter" or similar option from the list. | | Can't connect or communicate | • Voltage Mismatch : Check the jumper on the HW-597. It must be set to either 3.3V or 5V, matching your target device's logic level. • Baud Rate Mismatch : Ensure the baud rate set in your serial software (e.g., Arduino IDE, PuTTY, CoolTerm) exactly matches the baud rate of your target device. • Wrong Port : Double-check that you have selected the correct COM port in your software, as shown in Device Manager. • Incorrect Wiring : Verify your connections (e.g., TX→RX, RX→TX, GND→GND) are correct. | | It works intermittently | • The issue may be a faulty USB cable, a loose connection, or a poor-quality clone device, rather than a driver problem. |
Installing the driver on macOS requires a slightly different process due to the operating system's security protocols.
is a popular USB-to-TTL (Serial) converter module typically based on the hw-597 driver
3.3V and 5V dual operating levels (toggleable via onboard jumper shunt)
To use the HW-597, you must install the on your computer. HW-597 CH340 USB-TTL конвертер
Often defaults to 3.3V if no jumper is connected, but always verify with the specific PCB markings. You likely installed the parallel (printer) driver instead
You will need to install the driver that matches the black chip soldered onto your specific board.
Understanding the HW-597 Module and Ch340 Driver Compatibility
The HW-597 is a highly popular, low-cost USB-to-Serial (TTL) adapter module widely used in electronics prototyping. It bridges the communication gap between your computer's USB port and microcontrollers like the Arduino Pro Mini, ESP8266, ESP32, or Raspberry Pi Pico. Re-download and reinstall the CH340 driver
Linux has built-in kernel modules for both chipsets. No manual download is required for most distributions. The HW-597 driver is included in the kernel as:
Without the correct CH340 virtual COM port (VCP) driver installed, modern operating systems will fail to recognize the hardware. This results in connection failures, IDE sync issues, or "device not recognized" errors. Key Technical Specifications of the HW-597 Module