USB to RS485 Communication Module

USB to RS485 Communication Module is a compact interface converter that enables communication between a computer’s USB port and RS485-based devices. It is widely used for industrial control, serial device programming, and data acquisition applications due to its robustness and long-distance capabilities. The module converts USB signals to differential RS485 signals, allowing reliable data transmission over long distances up to 1200 meters.

Key Features:

• USB to RS485 Converter: Enables serial communication over USB interface.
• Plug and Play: No external power required, powered directly from USB.
• Built-in Transceiver: Integrated RS485 line driver and receiver IC.
• ESD Protection: Helps prevent damage from static discharge on RS485 lines.
• Auto Direction Control: Automatically switches between transmit and receive modes.

Technical Specifications:

• Interface: USB 2.0 (Type-A) to RS485 (2-wire)
• Chipset: CH340 / FT232 / CP2102 (varies by model)
• RS485 Communication: Half-duplex, asynchronous serial
• Baud Rate: 300 bps to 1 Mbps
• Distance: Up to 1200 meters (depending on cable and environment)
• Data Bits: 8
• Stop Bits: 1 or 2
• Parity: None / Even / Odd
• Operating Voltage: 5V (from USB)

Mechanical Specifications:

• USB Port: Standard USB Type-A Male
• RS485 Terminal: 2-pin screw terminal (A+, B−)
• Board Dimensions: Approx. 50mm x 15mm
• LED Indicators: TX, RX activity LEDs (optional)
• Enclosure: Open PCB or Plastic Case (model dependent)

Mounting Options:

• Plug-and-Play: Connects directly to USB port without driver installation (Windows 10+)
• Portable: Compact size allows integration in development kits or enclosures

Schematic Diagram, Connection, Wiring and Pinout:

• USB Side: Plug into PC or microcontroller USB port
• RS485 Side: Connect A(+) and B(−) terminals to RS485 network
• Wiring: Twisted-pair cable recommended for long distance
• Termination: 120Ω termination resistor may be needed at line ends

Datasheet and Documentation:

• Search for USB to RS485 Module Datasheet (CH340/FT232)

Applications:

• Industrial Automation: SCADA, PLC, and sensor interfacing
• Home Automation: RS485-based controller or node communication
• Energy Meters: Used to configure and monitor digital meters
• POS Systems: Connects to serial printers and barcode readers
• Security Systems: Connects alarm panels or RS485 cameras

Equivalent Models:

• CH340 USB to RS485: Affordable version with CH340G chip
• FT232RL USB to RS485: Professional version with FTDI chip
• CP2102 USB to RS485: Compact and reliable with Silicon Labs chip

Package Includes:

• 1 x USB to RS485 Communication Module