Waveshare Industrial RS485 to Ethernet Converter Serial Server TCP/UDP Modbus Gateway

Specifications

• Operating Voltage: 5V DC (via screw terminals / DC jack)
• Operating current: 150mA (@5V)
• Serial Interface: RS485 (A+, B-, GND terminals)
• Ethernet Interface: RJ45 10/100 Mbps auto-negotiation
• Baudrate: 600bps~230.4Kbps
• Network Operating Modes: TCP Server, TCP Client, UDP Server, UDP Client, Modbus Gateway
• Network Configuration: Web GUI configuration, Static IP, DHCP
• Operating Temperature: -40°C to +85°C
• Operating current: 150mA (@5V) 3-Pin Screw Terminal (RS485), RJ45 (Ethernet)
• Operating current: 150mA (@5V) Industrial PLCs, SCADA Systems, PC / Local Servers, Arduino / ESP32 (via RS485 interface)

Minimum hardware 

• 5V DC Power Supply: the converter's internal circuitry requires a stable 5V source to power the Ethernet transceiver and RJ45 magnetics; using a weak or noisy supply will cause network drops.
• Ethernet Cable (CAT5e/CAT6) : to physically connect the module to your local router or network switch.
• RS485 Device (e.g., PLC, Modbus Sensor, or Arduino with an RS485 shield) : to provide the local serial data stream that needs to be converted and broadcast over the network.

Safety Warnings

• Voltage Limits: Ensure your power supply is strictly 5V DC. Applying 12V or 24V (common in industrial setups) without a step-down converter will permanently damage the board.
• Polarity Warning: Double-check your VCC and GND connections on the terminal block before powering on. Reverse polarity can destroy the internal ICs instantly.

Accessories Included in the Box

• 1×Waveshare Industrial RS485 to Ethernet Converter 

Frequently Asked Questions

• Is this converter compatible with standard industrial PLCs?
  Yes, it works with any PLC supporting standard RS485 serial or Modbus RTU protocols.
  
• Can I use this to connect an Arduino to my local Ethernet network?
  Yes, you can wire your Arduino via an RS485 shield to the converter to broadcast its data over TCP/IP.
  
• Does this support standard Modbus TCP to RTU gateway conversion?
  Yes, it features built-in Modbus gateway functionality for seamless bidirectional translation.
  
• Can I use multiple of these modules on the same local network?
  Yes, each module can be assigned a unique static IP address or configured to use DHCP.
• What voltage does the G052B converter require?
  It requires a strictly regulated 5V DC power supply to operate safely.
  
• Can I power this directly from my 24V industrial control panel?
  No, you must use a DC-DC step-down buck converter to reduce the 24V rail to 5V before connecting it.
  
• How much current does this module draw during active transmission?
  It typically draws around 150mA at 5V during normal network operation.
• How do I wire my RS485 device to this converter? Connect the A+ and B- lines from your device directly to the matching A+ and B- screw terminals on the module.
  
• Does this module require a common ground with the RS485 device?
  While RS485 can often run on just two wires, connecting a common ground is highly recommended for stability over long distances.
  
• Can I connect the Ethernet port directly to my PC without a router?
  Yes, you can use a standard Ethernet patch cable to connect the module directly to your PC's RJ45 network port.
• Why is my module not connecting to the network? Check that your power supply is providing a stable 5V without voltage sag and that your Ethernet cable is fully seated.
  
• Why am I getting timeout errors on my Modbus polls?
  Ensure the A+ and B- wires are not swapped, and verify the baud rate setting matches your RS485 device exactly.