Education 1 min read

What Is an IoT Gateway? Connecting Factory Floor to the Cloud

TSL Automation Solutions April 22, 2025

What Is an IoT Gateway?

An IoT gateway is an edge computing device that acts as the bridge between your operational technology (OT) — PLCs, sensors, drives, HMIs — and your information technology (IT) infrastructure, including cloud platforms, MES systems, and ERP databases.

What Does an IoT Gateway Do?

Protocol translation — converts Modbus, PROFIBUS, or OPC UA data into MQTT, REST, or cloud-native formats
Edge processing — filters, aggregates, and pre-processes data locally to reduce cloud bandwidth
Security boundary — isolates the OT network from the internet, protecting PLCs from cyber threats
Local buffering — stores data during network outages and syncs when connectivity is restored
Remote monitoring — enables cloud dashboards and remote access to factory floor data

IoT Gateway vs SCADA vs Edge PC

An IoT gateway is lightweight — it collects and forwards data but does not run a full SCADA runtime. A SCADA system runs on an industrial Panel PC and handles operator control, alarming, and plant-wide visualization. An edge PC can do both, running SCADA locally while also connecting to the cloud.

Choosing the Right IoT Gateway Hardware

For industrial IoT gateway applications, look for:

Multiple COM ports (RS-232/422/485) for legacy PLC connectivity
Dual LAN ports for OT/IT network isolation
4G LTE or Wi-Fi for remote sites
Compact, DIN-rail mountable form factor
Wide temperature operation (−20°C to 70°C)

Avalue's compact embedded PCs and SBCs available from TSL Automation make excellent IoT gateway platforms — fanless, low power, and equipped with the I/O needed to connect to any industrial protocol.

Frequently Asked Questions

What does an IoT gateway do?

An IoT gateway acts as a bridge between IoT devices (sensors, PLCs, meters) and cloud or enterprise systems. It collects data from field devices via local protocols (Modbus, Zigbee, BLE, serial), processes and filters data locally, and transmits relevant data upstream via internet protocols (MQTT, HTTP/REST). This reduces the volume of data sent to the cloud and provides a local processing point for time-sensitive decisions.

Why is an IoT gateway needed instead of connecting devices directly to the cloud?

Many industrial and IoT devices cannot connect to the internet directly — they use legacy protocols (Modbus RTU, RS-485 serial), lack Ethernet or WiFi, operate at very low power, or require local data buffering when internet connectivity is unavailable. The IoT gateway provides protocol translation, local data buffering (storing data during connectivity outages), edge processing, and a secure demarcation point between OT and cloud networks.

What is edge processing in an IoT gateway?

Edge processing allows the IoT gateway to filter, aggregate, and analyse data before sending it to the cloud — reducing bandwidth requirements and providing faster local responses. Examples: averaging 100 sensor readings per second and sending 1-minute averages to the cloud; detecting anomalies locally and only sending alerts rather than raw data; running a simple ML model locally to classify equipment state without cloud round-trip latency.

What hardware form factors are used for IoT gateways?

IoT gateways range from small ARM-based single-board computers (Raspberry Pi-class, appropriate for prototyping), through dedicated gateway appliances (Moxa UC, Advantech WISE), to industrial fanless x86 PCs running Windows IoT or Linux for enterprise-grade deployments. For industrial automation with multiple PLC protocols and high data volumes, x86 industrial PCs provide the most software flexibility and processing capacity.

Does TSL Automation supply IoT gateway hardware in India?

Yes — TSL Automation Solutions supplies Avalue DIN rail and compact Box PCs suitable for industrial IoT gateway deployment. These run Windows IoT or Linux and can be pre-loaded with gateway software. Contact our Mumbai team for gateway hardware sizing and protocol support questions.

Tags: what is IoT gateway industrial IoT gateway OT to IT bridge IIoT gateway India edge gateway industrial

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TSL Automation Solutions

Head of Marketing, TSL Automation Solutions

Sanjana covers industrial automation trends, product launches, and technology insights for TSL Automation Solutions, a Mumbai-based distributor of HMI, Panel PC, and embedded computing systems serving manufacturers across India and globally.