WSAL22456 – USB TO RS485 (B)/en

Documentation notice: This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.

Summary

The USB to RS485 bidirectional converter uses the CH343G chip to convert USB into an asynchronous serial port. It supports automatic detection and dynamic adaptation of communication rates up to 115200 baud, and provides common modem signals for expanding asynchronous serial ports on computers.

Related products at JW Tech

WSAL22456 – Industrial USB TO RS485 Bidirectional Converter, Onboard original CH343G, Multi-Protection Circuits

Technical overview

Base circuitry: The converter is built around the CH343G USB bus adapter chip, which converts USB into a high-speed asynchronous serial port.
Features: Supports automatic identification and dynamic self-adaptation of communication rates up to 115200 bps, and supplies commonly used modem contact signals to expand asynchronous serial ports for computers.
Interfaces: The device exposes a USB connector on one side and an RS485 terminal block on the other; it operates bidirectionally.
Power supply: Operates at 5 V DC via the USB connector.
Supported operating systems: Windows 7/8/8.1/10/11, macOS, Linux/Raspberry Pi, and Android.
Windows driver setup: The system default CDC driver is used automatically; the vendor VCP driver must be installed manually and can be verified in Device Manager.
Linux/RPI usage: After connecting the device, query the serial device name with “ls /dev/tty*” and open a port with “minicom -D /dev/ttyACM0” as an example.
macOS usage: Download and install the appropriate driver first, then launch the serial debugging assistant application.
Android usage: Download and extract the Android app, install it, click “Scan Device”, select the detected device, and configure parameters.
Baud rate range: According to the FAQ, supported rates span 50 baud to 3 Mbps; the list includes 9600, 115200, 250000, 921600, 1M, 1.5M, 2M, and 3M.

Commands and examples – verify before use:

ls /dev/tty*
minicom -D /dev/ttyACM0

Notes and version constraints

The exact serial device name (e.g., ttyACM0 or ttyUSB0) may vary depending on the OS and driver type; verify before use.
Using the VCP driver requires manual installation; without it, only CDC driver features are available.
On Windows 7, a digital signature warning may appear after driver installation; the source recommends a repair tool but its link is missing – please clarify before use.
Supported baud rates are listed in the FAQ; whether every rate is available on all platforms should be verified in the target system.
No warranty, certification, or pricing information appears in the source; such details must not be added.

Source and revision record

USB TO RS485 (B) - Waveshare Wiki
Source revision: 108924
Captured: 2026-09-03T04:03:12+00:00
SHA-256: 6c5924a384dfa22492e4fb0cc07baed9fbb7802f919ef7225ba97d9bebbd6d8e