1. Introduction
The USR-N720-ETH is a next-generation IoT Edge Gateway designed for industrial applications. It supports edge computing, data acquisition, protocol conversion, and data reporting in JSON format. Equipped with two RS485 ports and one RJ45 Ethernet port, it facilitates rapid connection between industrial field equipment and cloud platforms. This gateway is suitable for various sectors including smart factories, smart grids, and smart water services.
2. Packing List
Please verify that all items are present and in good condition upon opening the package:
- USR-N720-ETH Gateway (x1)
- Power Adapter (x1)
- Power Adapter Cable (x1)
- Wall Mount Kit (x1)
3. Key Features
The USR-N720-ETH IoT Edge Gateway offers a robust set of features for industrial connectivity:
- Multiple Interfaces: Equipped with Ethernet and two RS485 ports.
- Protocol Conversion: Supports conversion from Modbus to MQTT+JSON and DL645 to MQTT+JSON.
- Powerful Edge Computing: Capable of handling up to 1000 data points, including data acquisition and analysis (addition, subtraction, multiplication, division).
- Rich Communication Protocols: Supports MQTT and TCP for flexible data transmission.
- Data Encryption: Provides TCP+SSL and MQTT+SSL for secure data communication.
- SD Card for Data Storage: Ensures data integrity through local caching.
4. Setup and Installation
4.1 Physical Installation
The USR-N720-ETH supports both DIN rail mounting and wall mounting for flexible installation in industrial environments. The device dimensions are 86mm (length) x 30mm (width) x 98.5mm (height).
Installation Steps:
- Mounting: Choose between DIN rail mounting or using the provided wall mount kit. Secure the gateway firmly in the desired location.
- Power Connection: Connect the power adapter cable to the power connector (DC 9-36V input) on the device. Ensure the power source matches the specified voltage range.
- Grounding: Connect the ground screw to a proper earth ground for electrical safety and stability.
- Ethernet Connection: Connect an Ethernet cable to the RJ45 ETH port for network connectivity.
- RS485 Connections: Connect your Modbus RTU or DL645 devices to the two RS485 ports as required.
- SD Card Insertion: Insert an SD card into the designated slot for data caching.
4.2 Initial Configuration
Initial configuration typically involves connecting the gateway to a computer via Ethernet and accessing its built-in web interface. Refer to the detailed user manual (PDF, if available) for specific IP addresses and login credentials.
5. Operating Instructions
5.1 Edge Computing and Protocol Conversion
The USR-N720-ETH collects data from Modbus RTU, Modbus TCP, and DL/T645-2007 protocols. It then converts this data into JSON format and reports it to IoT cloud platforms using MQTT or TCP protocols. The gateway supports up to 1000 data points and can perform local decoding and computation (addition, subtraction, multiplication, division) to reduce the processing load on the server.
5.2 Modbus Gateway Functionality
The gateway can act as a Modbus gateway, connecting Modbus RTU devices to Modbus TCP masters. This allows for local or remote monitoring by PLCs, SCADA systems, or private servers. It supports multi-host Modbus polling.
5.3 Custom JSON Configuration
The USR-N720-ETH allows for custom JSON message conversion, enabling compatibility with various server protocols without extensive modifications.
5.4 Data Encryption
For enhanced data security, the gateway supports SSL encryption for MQTT and TCP connections. It can establish up to five independent connections to different remote services, including two MQTT, two TCP, and one PUSR connection.
5.5 Offline Data Recording
The gateway features an SD card slot for data caching. In the event of an internet disconnection, collected data is automatically stored on the SD card. Once the network connection is restored, the cached data is then transmitted to the server, ensuring no data loss.
5.6 Remote Management
The USR-N720-ETH can be remotely managed via the PUSR Cloud. Users can monitor its operational status, perform firmware upgrades, and configure parameters remotely, which helps in saving time and operational costs.
6. Maintenance
6.1 High Reliability Design
The gateway is built with high reliability in mind, featuring:
- Metal Housing: Provides effective cooling and durability.
- Wide Power Input: Supports DC 9-36V, accommodating various power sources.
- Wide Operating Temperature: Designed for industrial use, operating reliably from -40℃ to +85℃.
- High EMC Protection: Ensures stable operation even in harsh electromagnetic environments.
- Watchdog Protection: Incorporates both hardware and software dual watchdog mechanisms for continuous stable operation.
6.2 Firmware Upgrades
Firmware upgrades can be performed remotely via the PUSR Cloud platform, ensuring your device always has the latest features and security patches. Consult the PUSR Cloud documentation for detailed instructions on remote firmware updates.
7. Troubleshooting
This section provides solutions to common issues you might encounter with the USR-N720-ETH gateway.
| Problem | Possible Cause | Solution |
|---|---|---|
| Device not powering on | Incorrect power supply, loose connection | Verify power adapter is connected correctly and supplying DC 9-36V. Check power cable integrity. |
| No network connectivity | Ethernet cable issue, incorrect IP settings, network configuration problem | Check Ethernet cable connection. Verify IP address, subnet mask, and gateway settings. Ensure network infrastructure is operational. |
| Data not reaching cloud | Cloud server unreachable, incorrect MQTT/TCP settings, firewall issues, internet disconnection | Check internet connection. Verify MQTT/TCP server address, port, and authentication details. Ensure firewall rules allow outbound connections. Check SD card for cached data. |
| Modbus/DL645 device communication failure | Incorrect wiring, wrong protocol settings, device address conflict, baud rate mismatch | Verify RS485 wiring (A/B lines). Check protocol settings (Modbus RTU/TCP, DL645), device addresses, baud rate, and parity. |
8. Specifications
| Feature | Detail |
|---|---|
| Model Number | USR-N720-ETH |
| Brand Name | PUSR |
| Interfaces | 1x Ethernet (RJ45), 2x RS485 |
| Supported Protocols | Modbus RTU, Modbus TCP, DL/T645-2007, MQTT, TCP |
| Edge Computing | Up to 1000 data points, data acquisition, analysis (addition, subtraction, multiplication, division) |
| Data Storage | SD Card for offline caching |
| Remote Connections | Up to 5 (2x MQTT, 2x TCP, 1x PUSR connection) |
| Security | SSL encryption for MQTT/TCP connections |
| Power Input | DC 9-36V |
| Operating Temperature | -40℃ to +85℃ |
| Protection | High EMC Protection, Hardware & software dual watchdog |
| Dimensions | 86mm x 30mm x 98.5mm |
| Mounting | DIN rail mount, Wall mount |
| Certification | CE |
| Origin | Mainland China |
9. User Tips
- Two-Way Communication: The gateway is capable of both reading and writing Modbus RTU registers. When sending commands via MQTT in JSON format to write to Modbus RTU registers, ensure your JSON payload is correctly structured according to the gateway's configuration for write operations. Verify the Modbus function code and register addresses are accurate.
- SD Card Management: Regularly check the SD card's storage capacity, especially in environments with frequent network disconnections, to prevent data loss due to a full card.
- Remote Access: Utilize the remote management features via PUSR Cloud for efficient monitoring and maintenance, reducing the need for on-site visits.
10. Warranty and Support
For warranty information, technical support, and service inquiries, please refer to the official PUSR website or contact your authorized dealer. Keep your purchase receipt as proof of purchase for warranty claims.
11. PUSR Factory Tour
Watch a brief video showcasing the manufacturing environment and quality control processes at the PUSR factory.