Waveshare CH343G Industrial USB-to-RS485 Converter (B) + USB Extension Cable

Industrial USB to RS485 Converter (B) CH343G

The Waveshare industrial USB-to-RS485 converter is a solution designed for stable, bidirectional signal conversion. The device is based on the CH343G chip, ensuring broad compatibility and seamless operation with many operating systems. The module guarantees fast data transmission at speeds ranging from 300 bps to 3 Mbps. Advanced protection features, such as a TVS suppressor, ESD protection, and a self-resetting fuse, safeguard connected equipment against overvoltage and voltage spikes. The device works great in applications with multiple devices and in installations with long signal lines. The converter is the ideal solution for communication with PCs and popular development platforms—perfect for Raspberry Pi, Arduino, ESP32, and ESP8266.

Key Technical Features

• Bidirectional conversion: Enables full communication between USB and RS485 buses.
• Automatic direction control: Hardware-based data flow management eliminates the need for additional control lines.
• Advanced protection: Dedicated 600 W TVS chips, 15 kV ESD protection, and a 200 mA self-resetting fuse protect against overloads and electrostatic discharges.
• LED indicators: Three LEDs provide real-time status information on power (PWR) and data transmission (TXD) and reception (RXD).
• Built-in 120 Ω resistor: The board features an integrated 120R terminating resistor, which ensures the stability of the RS485 bus.

Benefits

• High level of protection: Built-in safeguards protect valuable equipment from the effects of surges, discharges, and short circuits.
• Long transmission range: Allows data to be transmitted via the RS485 bus over distances of up to 1.2 km.
• Support for multipoint networks: Allows for connecting up to 32 nodes on a single communication bus.
• Wide compatibility: Works with Windows, Linux, Mac, Android, and WinCE systems.
• Simple installation and operation: Convenient terminal block screw connectors facilitate quick wiring.

Example Applications

• Communication with industrial sensors: Reading data from measuring devices equipped with an RS485 interface.
• Home automation and BMS systems: Connecting controllers and energy meters into a single monitoring network.
• Microcontroller-based automation projects: Expanding the communication bus in kits for Arduino, ESP32, and ESP8266.
• Device configuration and diagnostics: Programming and retrieving logs from field devices using a laptop or a microcomputer such as the Raspberry Pi.
• Industrial measurement networks: Connecting multiple actuator nodes over long distances in manufacturing facilities.

Technical Specifications

• Product Type: Industrial USB-to-RS485 Converter
• Converter chip: CH343G
• Host port: USB-A
• Device port: RS485 screw terminals (pins A+, B-, GND)
• Data rate: 300 bps to 3 Mbps
• USB operating voltage: 5 V
• USB interface protection: 200 mA self-resetting fuse, ESD protection
• RS485 interface protection: 600 W surge suppressor, 15 kV ESD protection, 120 Ω (120R) terminating resistor
• Transmission direction control: Automatic hardware control
• USB transmission range: approximately 5 m
• RS485 transmission range: approximately 1.2 km (at low speed)
• Operating mode: Point-to-multipoint (up to 32 nodes; repeaters are recommended for 16 or more nodes)
• LED indicators: PWR (power), TXD (USB data transmission), RXD (RS485 data reception)
• Operating temperature: -15°C to 70°C
• Operating humidity: 5% RH to 95% RH
• System compatibility: Windows 11 / 10 / 8.1 / 8 / 7, WinCE, Mac, Linux, Android

Package Contents

1. USB to RS485 Converter (B) x1
2. USB-A male to female extension cable x1
3. Screwdriver x1