---
title: "Sentera internet gateway"
url: "https://maker.wiznet.io/Lihan__/resellers/sentera-internet-gateway/"
markdown_url: "https://maker.wiznet.io/Lihan__/resellers/sentera-internet-gateway/md"
type: "VAR: Value-Added Reseller Products"
author: "Sentera"
author_url: "https://www.sentera.eu/en/productdetails/sentera-internet-gateway-ethernet-or-wi-fi/167208"
editor: "WIZnet"
editor_url: "https://maker.wiznet.io/"
original_author: "Sentera"
original_url: "https://www.sentera.eu/en/productdetails/sentera-internet-gateway-ethernet-or-wi-fi/167208"
published: "2025-11-13"
language: "en"
likes: 0
views: 345
comments: 0
source: "WIZnet Makers (https://maker.wiznet.io/)"
---

# Sentera internet gateway

> The gateway can be connected to the Sentera devices using either an Ethernet cable or a Wi-Fi network.

Original author: Sentera (source: https://www.sentera.eu/en/productdetails/sentera-internet-gateway-ethernet-or-wi-fi/167208)

## Article

### 1. How WIZnet products are used

Internal board photos confirm the use of a **CETUS JB1821C0D Ethernet module**, which integrates the **WIZnet W5500** chip.
The W5500 handles the full TCP/IP stack in hardware, enabling efficient, reliable Ethernet communication with minimal load on the main MCU.
This allows the DIG-M-2 to maintain a stable and secure cloud connection while ensuring precise real-time Modbus RTU communication over RS485.

![](https://maker.wiznet.io/upload/ckeditor5/616178329%5F1763032579%2Epng)

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### 2. Technologies, techniques, and unique implementation

**Modbus RTU over RS485**: An industrial standard communication protocol; the gateway collects data from multiple slave devices

**Automatic cloud sync**: No need for custom backend servers—auto-registers to the SenteraWeb platform

**RJ45 for both power & data**: Simplified wiring through a unified port

**Dual network modes**: Supports both Ethernet and Wi-Fi for flexible deployment

**Built-in web UI**: Offers scheduling, status monitoring, firmware updates, and configuration directly via browser without external tools

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### 3. Overall project flow

**RS485 connection**

Legacy HVAC devices stay connected via RS485

DIG-M-2 acts as a Modbus RTU master or client

**Internet connection**

Device connects via Ethernet or Wi-Fi

Cloud registration is automatic through SenteraWeb

**Data exchange**

Modbus RTU data is read and transmitted to the cloud

Remote changes from the cloud are pushed back as Modbus commands

**Remote UI access**

SenteraWeb provides full control: monitor temperatures, change fan speeds, set schedules, receive notifications

**Maintenance & scalability**

Firmware updates can be pushed remotely

Multiple devices are manageable through a single cloud dashboard

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### 4. Technical synergy with WIZnet

WIZnet Ethernet solutions complement the DIG-M-2 design by:

**Ensuring robust connectivity with hardware TCP/IP stackMinimizing MCU load**, enabling precise Modbus timing and command handling

**Simplifying DNS and cloud communication** with built-in protocol support

**Enabling secure and scalable deployment** for multiple gateways

In this context, WIZnet hardware offers a high-reliability, low-maintenance network layer that perfectly aligns with cloud-connected Modbus RTU applications.

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### 5. Application ideas and potential extensions

**Retrofit existing Modbus RTU systems** for cloud-based operation without changing hardware

**Smart building automation**: integrate HVAC, ventilation, and lighting into one remote dashboard

**OEM-ready gateway platform**: manufacturers can bundle it with their control devices

**Energy analytics platform**: collect usage data to optimize performance and reduce costs

**Remote service & diagnostics**: minimize technician dispatch by pre-analyzing issues via the cloud

**Alarm and event management systems**: use real-time alerts for proactive maintenance

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Source: https://maker.wiznet.io/Lihan__/resellers/sentera-internet-gateway/