RS485 to RJ45 Ethernet Module

WaveshareSKU: WAV-20978
Sale price £21.60
incl. VAT
excl. VAT
In stock

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This is an RS485 device data acquisitor / IoT gateway designed for the industrial environment. It combines multiple functions in one, including serial server, Modbus gateway, MQTT gateway, RS485 to JSON and more.

The module features RS485 and Ethernet ports, uses screw terminals for power input and supports 9~24V wide-range power supply in a rail-mount flame-retardant case design.

Small in size and easy to install, it is suitable for applications such as data acquisition, IoT gateways, safety & security IoT and intelligent instrument monitoring.

Feature Summary

  • Industrial Serial Server
  • Rail-mount
  • RS485 to RJ45 Ethernet
  • TCP/IP to Serial
  • Modbus Gateway
  • Multiple Communications
  • Terminal Power in
  • RJ45 Ethernet
  • Multi-host Support
  • Multi Features
  • Host/Webpage Config
  • Industrial Quality

Feature Detail

Primary Function - Bi-directional transparent data transmission between RS485 and ethernet.

Industrial Serial Server primary function

Rail-Mount Support - Easy to combine multi rail-mounted serial servers together.

Industrial Serial Server rail mount

Modbus Gateway Support - Suitable for Modbus gridding upgrade, can be used with 3D configuration software.

Industrial Serial Server Modbus

Multi Communication Modes - Supports TCP Server / TCP Client / UDP Mode / UDP Multicast.

Industrial Serial Server TCP UDP

MQTT/JSON To Modbus - More flexible conversion between different protocols.

Industrial Serial Server MQTT

  • When used as an MQTT gateway, the devices can upload serial data to the MQTT server by MQTT protocol through transparent transmission, supported servers including Baidu Cloud MQTT, Alibaba Cloud MQTT, China Mobile OneNet, etc. The acquired Modbus RTU or non-standard serial data can be parsed into JSON format and packaged into an MQTT data packet for uploading.
  • When used as JSON data acquisition gateway, the devices can be connected to data acquisition instruments through RS485 connection, then acquire data automatically, convert the data into JSON format, and finally post it to server. The acquired data supports Modbus RTU 645 instrument 97 version, 645 instrument 07 version, as well as sorts of non-standard RS485 protocols. The uploaded data format can be configured via host, and the JSON upload protocol can be MQTT protocol, HTTP POST protocol, HTTP GET protocol and so on.

Multi Hosts Roll-Polling Support - Different network devices will be identified and respond respectively, no more crosstalk issues while communicating with multi-network devices.

Industrial Serial Server roll-polling

User-Defined Heartbeat/Registration Packet - Easy for cloud communication and device identification.

Industrial Serial Server Heartbeat

NTP Protocol Support - Getting network time info for serial output or data upload.

Multi Configuration Methods - Supports web browser configuration, obtaining dynamic IP via DHCP, DNS protocol connected domain server address.


Industrial Serial Server Interface

Package Contents

  • 1x RS485 to Ethernet (B) Unit



Communication interface RS485, screw terminal, supports 32x slave devices
Power supply 9 ~ 24V DC, screw terminal
Dimensions L × W × H: 87 × 36 × 59 mm
Ethernet 10 / 100M auto-negotiation RJ45 connector, 2 KV surge protection
Serial port RS485 × 1: RXD, TXD, GND
Serial Specification
Baudrate 300 ~ 115200 bps
Parity bit none, odd, even, mark, space
Data bit 5 ~ 9 bits
Flow control N/A
Configuration host, web browser, device management functions library
Communication method TCP/IP direct communication, VCOM
Operating mode TCP server, TCP client (coexisting with TCP server), UDP, UDP multicast
Environment Requirement
Operating temperature -40℃ ~ 85℃
Storage temperature -45℃ ~ 165℃
Humidity range 5% ~ 95% relative humidity

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