The sides of a machine need sensors, a control panel calls for an HMI display, an existing system requires additional I/O modules—standard PC enclosures lack the mounting structures for any of these. Fanless industrial PC are designed from the ground up with industrial expansion in mind, but with a dozen product lines on the market, choosing the right integration path can be difficult.

This article traces a complete route from hardware selection and physical mounting to software configuration, using common sensor connection scenarios found in real deployments. The goal is to help system integrators build a maintainable sensor collection layer quickly in industrial environments that include Rockwell / Allen-Bradley ecosystems.

1. First, Understand: Which Interface Does Your Sensor Use?

Sensors on the industrial floor come in many varieties, but their physical connectors fall into three categories: serial buses, digital/analog I/O, and Ethernet. Getting the interface type right is the first step of integration.

RS-485 serial buscovers the widest range of sensor types. A single RS-485 bus can connect up to 32 devices (expandable with a repeater), supports transmission distances of up to 1,200 meters, and offers strong common-mode noise immunity. Most analog sensors—temperature transmitters, pressure gauges, humidity sensors, energy meters—support the Modbus RTU protocol and connect to a fanless industrial PC's serial port via RS-485.

The USR-EG228 provides 2 RS-485 ports. The USR-EG528 has 4 RS-485 ports (2 of which can be software-switched to RS-232). The USR-EG928A offers RS-232/RS-485/CAN interfaces. Together, these three models cover everything from light-duty data collection (2 RS-485 ports) to medium-to-large systems (4 RS-485 ports + CAN).

Digital I/O (DI/DO)suits switch-type sensors that only need to send on/off signals. Photoelectric switches, limit switches, and water-level sensors can connect directly through GPIO or DB15 interfaces without any protocol conversion. The USR-EG828-GL includes AI/DI/DO interfaces, and the USR-EG928A supports DI/DO + CAN, both of which can connect directly to on-site switch signals.

Ethernet portsare the right choice for high-resolution sensors and networked devices. GigE Vision cameras, intelligent instruments, and remote I/O modules that support Modbus TCP all communicate over Ethernet. The USR-EG528 and EG628 both come with 2 Ethernet ports. The EG928A provides Gigabit Ethernet + WiFi 6, meeting multi-network redundancy requirements.

Arduino-compatible interfaceswork well for prototyping and lightweight sensor arrays. The USR-EG118 integrates an ESP32 module that supports Arduino IDE development, with 1 AI (analog input), 1 DI, and 2 DO ports built in. It is suitable for scenarios like agricultural irrigation and small water treatment plants where sensor networks need to be set up quickly.

2. Physical Mounting: Where the Fanless Industrial PC Has a Structural Edge

Standard PC cases are designed for desktop environments. Adding sensors and expansion modules usually requires purchasing DIN rail kits or wall-mount brackets separately. Fanless industrial PCs solve this problem through their enclosure design.

Aluminum alloy integrated chassisis common across fanless designs, but PUSR takes it two steps further:

First,passive cooling and mounting structure are unified. The full-aluminum enclosure doubles as a heatsink. The unit mounts to the side wall of a control cabinet or distribution box through rear mounting holes or DIN rail clips, while the fin structure on the enclosure increases surface area for heat dissipation—no extra brackets or fans needed. The EG228, EG528, and EG828-GL all support DIN rail mounting. The EG928A supports both wall mount and DIN rail installation.

Second,modular I/O expansionis a unique architecture in the PUSR EG628 series. On traditional industrial PCs, interfaces are fixed on the motherboard, and expansion requires purchasing external serial servers or USB adapters. The EG628 uses a modular structure: through high-speed expansion interfaces, you can add RS-485, CAN, DI/DO, and other modules flexibly—just like building blocks, expanded on demand. For system upgrades that need additional sensor nodes later, there is no need to replace the entire unit.

Environmental considerations for installation: Fanless does not mean sealed. The absence of a fan means no air vent pulling dust inward, but port openings and seams still require protection. On the industrial floor, it is recommended to install the unit inside a sealed control cabinet paired with an IP65 or higher rated enclosure. The EG228, EG528, EG828-GL, and EG928A all hold CE/ROHS/WEEE certifications, while the EG628, EG528, and EG928A additionally hold 3C certification, meeting market access requirements in multiple countries.

3. Software Configuration: From Sensor Data to Cloud Reports

Once the hardware is connected, the real value emerges at the data layer. Fanless industrial PCs run Linux Ubuntu (EG228/EG928A come with Ubuntu 22.04, EG528 with Ubuntu 24.04), making them naturally suited for industrial software stacks.

Option A: Node-RED Drag-and-Drop Programming (Recommended for Beginners)

Node-RED is the visual programming tool pre-installed on PUSR industrial PCs. Through drag-and-drop nodes and connection lines, the entire process of sensor data acquisition, protocol conversion, and data reporting can be completed without writing low-level code.

Steps:

• Connect the sensor to the industrial PC's serial port via RS-485

• Add a Modbus RTU read node in Node-RED, configure baud rate, data bits, and stop bits

• Add data processing nodes (filtering, threshold checks, unit conversion)

• Add an MQTT send node to report data to the PUSR cloud platform or Alibaba Cloud

• Deploy and run—the entire process takes about 30 minutes

Option B: WukongEdge Engine Integration

WukongEdge is PUSR's self-developed edge computing engine, integrated into the EG528, EG628, and EG928A. It combines gateway management, edge computing, local data monitoring, and PLC programming into a single system, suitable for scenarios that require unified management of multiple collection nodes.

WukongEdge supports mainstream industrial protocols (IEC 61850, IEC 104, DL/T 645, DNP3.0, BacNet) and is compatible with major PLC brands including Siemens, Mitsubishi, Omron, and Delta. Data collected and processed locally is reported to cloud platforms via MQTT.

Option C: Docker Containerization (For Advanced Users)

For scenarios that require running custom Python/Node.js programs or a third-party MQTT Broker, PUSR industrial PCs support Docker application installation. Both EG628 and EG528 explicitly support Docker, allowing flexible combination of open-source toolchains such as Telegraf + InfluxDB + Grafana to build a complete edge data dashboard.

4. Scenario Examples: Three Typical Integration Paths

Scenario 1: Small Workshop Temperature Monitoring System

Six temperature transmitters (0-10V output) aggregate through an ICP-DAS 7017R Modbus I/O module (8-channel analog input) onto an RS-485 bus, connecting to a USR-EG228. Node-RED reads the Modbus registers, and when data exceeds thresholds, it reports via 4G/WiFi to a mobile device. Total hardware cost stays under 2,000 RMB, with configuration completed in about 30 minutes.

Scenario 2: Production Line Sensors + PLC Coordination

Twenty sensors distributed across four RS-485 buses, plus eight digital inputs (photoelectric switch triggers), connect to a USR-EG628. Two additional RS-485 modules are added through the modular expansion interface. The WukongEdge engine handles protocol conversion (Modbus RTU to Modbus TCP), while the local OpenPLC controller drives production line actions based on sensor data without requiring a host computer. The EG628's modular expansion leaves room for adding more sensors later.

Scenario 3: Outdoor Cabinet Multi-Protocol Fusion Collection

Inverter data (Modbus TCP), energy meters (RS-485), and environmental sensors (DI/DO) from a solar photovoltaic station are concentrated in an outdoor cabinet. The USR-EG928A serves as the edge computing node: its dual Ethernet ports connect the inverter network and sensor network separately, while RS-485 and CAN interfaces connect to energy meters and environmental sensors. The EG928A's built-in 6 TOPS NPU can run lightweight AI models for anomaly detection (such as inverter power deviation prediction). Data is reported to the energy management platform via 4G/WiFi 6. The EG928A holds 3C/CE/FCC/ROHS/WEEE certifications, making it suitable for harsh outdoor environments.

5. Selection Guide: Choosing by Scale

Frequently Asked Questions

1. How does a fanless industrial PC dissipate heat?

Heat generated by the CPU transfers through thermal interface material to the aluminum alloy enclosure, which simultaneously acts as a heatsink to radiate heat into the surrounding air. The absence of a fan eliminates air vents that draw dust inward and removes the mechanical wear failure point entirely. PUSR industrial PCs use wide-temperature design (-25°C to +75°C) and maintain stable operation under industrial temperature fluctuations.

2. Without a fan, will the industrial PC throttle under high load?

It will, but this is a normal protection mechanism. Fanless industrial PCs use low thermal design power (TDP), typically 6-15W. Paired with temperature sensing and frequency-adjustment strategies in Intel/ARM industrial-grade processors, the unit will not throttle under rated load. If ambient temperature exceeds the design range, the system automatically reduces power consumption to avoid overheating—which is more controllable than a fan seizing and causing an unexpected crash.

3. How many sensors can a fanless industrial PC connect to?

This depends on interface count and communication protocol. A single RS-485 bus can connect up to 32 Modbus devices (expandable with repeaters). The USR-EG528 provides 4 RS-485 ports, theoretically managing up to 128 sensors on a single unit. When using Ethernet to connect intelligent sensors, the upper limit depends on the switch port count.

4. Does fanless design mean dustproof and waterproof?

Not equivalent. The absence of a fan eliminates the largest path for dust entry, but device ports and seams still require protection ratings. Most PUSR industrial PC models hold CE/ROHS/WEEE/3C certifications. It is recommended to install the unit inside a sealed control cabinet paired with an IP65 or higher rated enclosure.

5. Can a fanless industrial PC be added to an existing Rockwell/Allen-Bradley PLC environment?

Yes. The PUSR EG series includes the WukongEdge engine, which natively supports Modbus protocol and can communicate directly with Rockwell/Allen-Bradley PLCs to collect data. Ethernet-connected Allen-Bradley EtherNet/IP devices are also supported without requiring an additional protocol conversion gateway.

6. What is the difference between a fanless industrial PC and an edge gateway?

"Edge gateway" describes a functional role, while "fanless" describes a cooling method. Many edge gateways are fanless industrial PCs, but the two terms are not interchangeable. A PUSR industrial PC combines both: the fanless structure provides hardware reliability, and the WukongEdge engine provides edge gateway functionality.

7. Can sensor data be stored locally?

Yes. PUSR industrial PCs support local SSD or TF card storage. The EG228 and EG528 (K version) support external TF card expansion, and the EG928A supports 128GB eMMC plus external TF card. When the network is disconnected, data can be cached locally and automatically replayed once the network recovers (Store-and-Forward mechanism).

8. Can non-programmers configure a sensor collection system?

Yes. Models including the USR-EG228, EG528, and EG628 come pre-installed with the Node-RED visual programming tool. Data acquisition, filtering, and reporting workflows can be completed by dragging nodes and drawing connections—no code writing required. The EG628 also includes OpenPLC, supporting five IEC 61131-3 standard PLC