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USB to RS-485 Converter Adapter — CH340 / PL2303 / FT232RL, Modbus RTU, Arduino
USB to RS-485 Converter Adapter CH340 / PL2303 / FT232RL, Modbus RTU, Arduino
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USB to RS-485 Converter Adapter - CH340 / PL2303 / FT232RL, Modbus RTU, Arduino
This USB to RS-485 converter provides a plug-and-play interface between a PC USB port and RS-485 industrial networks. Using a reliable CH340, PL2303, or FT232RL USB-to-UART bridge IC with RS-485 transceiver, it enables Modbus RTU communication, industrial sensor configuration, and RS-485 device programming from any Windows, Linux, or macOS computer.
Key Specifications
| Parameter | Value |
|---|---|
| USB Bridge IC | CH340 / PL2303 / FT232RL (select variant) |
| Interface | USB 2.0 (Full-Speed) to RS-485 |
| RS-485 Standard | EIA/TIA-485 (half-duplex, 2-wire) |
| Baud Rate | 300bps - 921600bps |
| RS-485 Terminals | A(+), B(-), GND screw terminals |
| Max Cable Length | 1200m @ 100kbps |
| Max Nodes | 32 (standard) / 256 (with repeater) |
| Direction Control | Automatic (hardware flow control) |
| Operating Temperature | -40C to +85C |
| OS Support | Windows 7-11, Linux, macOS |
USB Bridge IC Comparison
| IC | Driver | Reliability | Best For |
|---|---|---|---|
| CH340 | CH340 driver (free) | Good | Budget, Arduino projects |
| PL2303 | PL2303 driver | Good | General use |
| FT232RL | FTDI VCP (built-in Win10+) | Excellent | Industrial, professional use |
Why Choose This Converter?
- Plug-and-Play - Recognized as virtual COM port; no configuration needed
- Auto Direction Control - Hardware automatically switches between transmit and receive; no RTS/CTS needed
- 1200m Range - RS-485 differential signaling for long-distance industrial communication
- 32+ Node Support - Connect multiple RS-485 devices on one bus (Modbus RTU network)
- Screw Terminals - Secure wire connection for industrial installation
Typical Applications
- Modbus RTU master/slave communication (PLC, VFD, energy meter)
- Industrial sensor and actuator configuration (RS-485 protocol)
- Building automation (BACnet MS/TP, DALI over RS-485)
- Solar inverter and battery BMS monitoring
- Arduino RS-485 network development and testing
- DMX512 lighting control interface
Wiring Guide
Connect A(+) terminal to RS-485 device A(+) wire. Connect B(-) to device B(-) wire. Connect GND to system ground (optional but recommended for noise immunity). Add 120 ohm termination resistor between A and B at each end of long cable runs.
FAQ
Q: What COM port does this adapter use? Windows assigns a virtual COM port (e.g., COM3, COM4) automatically after driver installation. Check Device Manager to find the assigned port number.
Q: Can this adapter communicate with Modbus RTU devices? Yes - use Modbus Poll, ModScan, or any Modbus RTU software. Set baud rate, parity, and stop bits to match the device (typically 9600/19200 baud, 8N1 or 8E1).
Package Contents
- 1x USB to RS-485 Converter Adapter
