EG8208 8-Port RS485 Edge Gateway – 4G LTE Modbus to MQTT/JSON Converter

Description

The EG8208 is an industrial-grade 8-Port RS485 Edge Gateway designed for multi-device industrial networking in demanding environments. It enables bidirectional transparent data transmission between RS485 and Ethernet, while supporting Modbus RTU to TCP conversion, multi-host polling, and user-defined JSON data reporting for flexible integration.

With built-in Node-RED, multiple operating modes, and support for a wide range of PLC protocols, the EG8208 is well-suited for factory automation, outdoor deployments, and industrial IoT applications, enabling stable and efficient data connectivity and protocol integration across diverse scenarios.

Key Features

RS485 Serial Interface

8 isolated channels, 1200–115200 bps configurable per port

Multiple Operational Modes

Supports TCP Server/Client, UDP, MQTT, and HTTP Client modes

Remote Virtual LAN

Secure VPN for remote PLC program upload/download

Multi-Protocole

Seamless communication across different protocols

Low-Code Development

Drag-and-drop logic for serial data processing and control

Gestion à distance

Remote configuration, debugging, and program updates

Reliable Connectivity

4G / Ethernet / Wi-Fi with auto failover

Industrial-Grade

Operates from −40°C to 85°C with 9–36V wide voltage input

* Soutien OEM/ODM, contact customer service for details.

EG Series Products

All gateways in the EG series share a highly consistent operating method. Differences between models are mainly reflected in hardware interfaces, and the corresponding variations are limited to the presence or absence of certain functional nodes.

Quick Access to EG Series Products →

Main Functions

Massive PLC Protocols

– Highly Compatible – 

The EG8208 8-Port RS485 Edge Gateway supports docking various mainstream CNC brands, including but not limited to SIEMENS, MELSEC, Mazak, Heiden-hain, Haas, KND, LNC, Fanuc, Brother, GSK, CITIZEN, SYNTEC, and so on. Please contact us to get the list of the specific CNC protocol models.

Multi-Protocol Support

This gateway supports standard industrial protocols, including Modbus, MQTT, OPC UA/DA, HJ212, and IEC104, enabling seamless integration with SCADA systems, cloud platforms, and other third-party applications.
For non-standard protocols, custom parsing and logic can be implemented using JavaScript (JS).

8-Channel Independent Power Supply

8-channel independent power supply for sensors. The external power supply voltage is equal to the gateway power supply voltage. The maximum current per channel is 1A, and the maximum total current is 4A.

Encryption Transmission

Use two-way certificate verification + SSL encryption transmission mechanism to ensure data security. Transmission protocols such as TCP, HTTP, and MQTT can all achieve anti-eavesdropping, anti-tampering, and anti-impersonation.

Remote Virtual LAN/ Port série

– PLC Remote Upload & Download –

With Virtual Ethernet and Virtual Serial Port, engineers can remotely access PLCs, HMIs, and serial devices for programming, maintenance, and debugging as if they were on the same local network.

Gestion à distance

With EGManager remote management software, this multi-port gateway can realize remote configuration, remote debugging, remote diagnosis, remote program update, and other functions for the equipment on site.

Drag & Drop Programming

Built on Node-RED drag-and-drop visual programming, EG8208 supports all traditional serial server functions without communication restrictions. It enables users to customize data formats and logic, seamlessly integrating sensors and third-party platforms via MQTT/JSON to build simple, flexible, and efficient IoT automation workflows.

Multiple Working Modes

1. TCP Server

Monitor the set port and wait for a TCP client connection. Transmit the data sent by the serial device transparently to all successfully connected client-side.

2. TCP Client

Initiate a TCP connection to the set IP address. lf fail, EG8208 will continue to try to reconnect until it succeeds. lf connect well, the server can transparently transmit data bidirectionally with the serial port device.

3. UDP Mode

Send the serial device data to the specified lP network device via UDP mode. EG8208 also monitors the port and forwards all received data to the serial device.

4. MQTT Mode

Support communication between serial data and servers through the MQTT protocol.

5. HTTP Client

Support submission of serial data to designated servers via HTTP.

6. Simultaneous Access From Multiple Hosts

Allow multiple computers to access the same serial port device at the same time
Only in the question-and-answer query mode.

8-Port RS485 Edge Gateway Applications

1. Multi-Channel Serial Device Centralized Collection and Reporting

This is the most typical application of the EG8208 8-Port RS485 edge gateway. In smart water, environmental monitoring, and smart agriculture, there are often numerous distributed 485 devices on site, such as flow meters, water quality sensors, and weather stations. The EG8208 can connect all these devices in one go, collect and process the data centrally, and upload it to the cloud platform or data center via 4G or wired network.

2. Industrial On-Site Protocol Conversion and Data Integration

The gateway comes with a rich protocol library, supporting industry protocols such as Modbus, DLT645, and CJ188. It also supports communication protocols of mainstream PLCs, including Siemens and Mitsubishi. The EG8208 can convert data from different protocols into a unified format (e.g., MQTT, HTTP), making it easy to interface with upper-level systems such as MES and SCADA.

3. Networking with IO Acquisition Terminals to Build a Distributed System

The EG8208 can act as a central gateway and network with multiple remote IO acquisition terminals like the ET3410 via the MQTT protocol, forming a distributed monitoring system with wider coverage and enabling remote access to distributed digital and analog signals.

The Core Advantage

The EG8208 is an industrial communication hub designed for multi-serial scenarios, especially suitable for cases where numerous distributed serial instruments and sensors need to be centrally networked and intelligently processed.

FAQ

Q1: Is the EG8208 industrial-grade and suitable for harsh environments?

A1: Yes, the EG8208 is a true industrial-grade gateway:

• • Wide operating temperature: -40℃ to 85℃, suitable for extreme conditions.

  • Rugged and durable: Enclosure made of galvanized steel, supports DIN35MM standard rail mounting, with a compact footprint of 133 × 106 × 25 mm.

  • Strong anti-interference capability: Features ESD and surge protection, and has passed relevant EMC testing.

Q2: Does it support other networking options besides 4G?

A2: Yes. The EG8208 comes with a standard 4G full-network module (optional Quectel CAT4 module) and also offers a 10/100/1000M adaptive Ethernet port (WAN/LAN), enabling flexible wired or wireless Internet access depending on the on-site network conditions.

Product Size and Ports

Packing List