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Product description: USB - 4-channel RS485 converter - CH344L - Waveshare 25219
An industrial USB to RS485 converter designed for applications requiring reliable serial communication. It expands a single computer USB port with four independent RS485 channels , enabling simultaneous, interference-free communication with multiple devices. The design is based on the CH344L and SP485EEN chips, ensuring high compatibility and transmission stability. The converter is equipped with advanced overvoltage, short-circuit, and ESD protection to protect both the device and the connected infrastructure. Supporting baud rates from 1200 bps to 460,800 bps and capable of communication distances up to 1200 m, it is ideal for industrial automation systems, PLCs , measurement, and monitoring systems.
The manufacturer has prepared a detaileduser guide that will make it easier to work with the converter.
USB - 4-channel RS485 converter - CH344L - Waveshare 25219.
Industrial grade non-isolated USB to 485 converter.
Main features of the converter
- 4 independent RS485 channels : enable simultaneous communication with four separate RS485 buses
- USB Type B interface : quick connection to a computer without the need for additional power supply
- Baud rate from 1200 bps to 460800 bps : wide range of configurations for various industrial applications
- RS485 communication range up to 1200 m : stable data transmission over long distances
- Switchable 120Ω terminating resistors : individually activated via DIP switches
- TVS and ESD protection : protection against electrostatic discharge and surges
- Self-resetting fuse : overload and short circuit protection
- Aluminum alloy housing : high mechanical resistance and effective heat dissipation
- Support for up to 32 devices on the bus : point-to-multipoint communication
- LED indication : LEDs indicating power, activity and data transmission for each channel
USB and RS485 communication interfaces
The converter utilizes a USB Type-B port on the computer side and four independent RS485 interfaces available on convenient screw-type connectors . Each channel has A+, B-, and PE pins, facilitating integration with industrial devices, PLCs, energy meters, and telemetry systems. Automatic transmission direction switching eliminates the need to manually control the transmit and receive lines. Additionally, each channel can utilize its own 120Ω terminating resistor , which can be activated using DIP switches located on the housing.
Four independent channels allow for simultaneous operation of different installation segments from a single computer.
The housing allows for wall and DIN rail mounting.
Compatibility with operating systems
The converter is designed to work with the most popular operating systems used in both industrial and hobbyist applications. It supports Windows 7, Windows 8, Windows 8.1, Windows 10, Windows 11, Linux, macOS, and Android . In Linux and Raspberry Pi, the converter can operate using standard system drivers, significantly simplifying implementation. This makes it suitable for both industrial computers and projects based on Raspberry Pi, mini-PCs, and HMI operator terminals.
Technical specifications of the converter
- Communication systems: CH344L, SP485EEN
- Host Interface: USB Type B
- Device interface: 4x RS485
- Supply voltage: 5 V
- Current consumption: 23.6 mA
- Transmission speed: from 1200 bps to 460800 bps
- Transmission mode: point-to-multipoint
- Maximum number of devices: 32 nodes
- Maximum RS485 transmission distance: up to 1200 m
- Maximum USB cable length: approximately 5 m
- Terminating resistors: 120 Ω, selectable via DIP switches
- USB Protection: 500 mA self-resetting fuse, ESD
- RS485 Protection: TVS 600 W, surge protection, 15 kV ESD
- Operating temperature: -40°C to 85°C
- Operating humidity: 5% RH to 95% RH
- Supported systems: Windows 7 / 8 / 8.1 / 10 / 11, Linux, macOS, Android
- Housing material: aluminum alloy
- Mounting method: wall and DIN rail
- Dimensions: 86.2 x 48 x 27.2 mm
- Weight: 181 g
Contents of the set
- 1x USB - 4-channel RS485 converter
- 1x USB Type A to USB Type B cable, approximately 1.2m long
Each channel can use its own 120Ω terminating resistor, which can be activated using DIP switches located on the housing.
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