Leading-edge HART to Modbus, Ethernet, and RS485 Solutions
The Evolution of Analog Signal Architecture in the IIoT Era
The global industrial automation landscape is undergoing a profound transformation. While the 4-20mA analog signal has been the bedrock of process control for decades, the integration of the HART (Highway Addressable Remote Transducer) protocol has extended its utility into the digital age. HART allows for the simultaneous transmission of digital information over traditional analog wires, providing a cost-effective bridge to smart manufacturing. As a leading China HART signal manufacturer, we recognize that the current commercial status is shifting from simple signal transmission to complex data analytics.
In modern industrial plants, the need for diagnostic data—such as sensor health, calibration status, and multi-variable measurement—is paramount. The 4-20mA signal provides the primary process variable, while the HART digital layer provides the "why" and "how" behind the data. This dual-capability is critical in sectors like Oil & Gas, Water Treatment, and Chemical Processing where downtime is prohibitively expensive.
Most legacy systems are limited by the uni-directional nature of 4-20mA loops. By implementing a HART to Modbus or HART to Ethernet converter, operators can unlock "stranded" data from smart instruments. This allows for predictive maintenance, reducing operational risks by identifying instrument drift before it affects production quality.
Jiaxing Songmao Electronics Co., Ltd. was established in 2007. It has always been driven by technological innovation, deeply engaged in the field of industrial automation, and gradually developed into a high-tech enterprise integrating R&D, production and sales. The company focuses on the independent research and development of core technologies such as HART protocol communication products and data collectors. Through continuous technological breakthroughs and market expansion, it has established a leading position in the industry.
Transitioning from Legacy Loops to Intelligent Industrial Networks
Widespread adoption of FSK (Frequency Shift Keying) to allow digital commands to ride on 4-20mA signals. Focus on stability and noise rejection in harsh environments.
Integrating HART with Modbus RTU/TCP, Profibus, and Ethernet. Our 32-channel gateways represent the pinnacle of this integration, enabling massive data backhaul.
Moving toward mesh networking and 4G/GPRS remote transmission (as seen in our SM626H-D series) to eliminate wiring costs in remote locations.
Converters with built-in edge processing to analyze signal patterns and predict instrument failure locally, reducing bandwidth and response time.
Oil & Gas
Refinery automation and tank monitoring.
Natural Gas
Pipeline pressure and flow telemetry.
Water Treatment
PH, turbidity and flow data collection.
Environmental
Emission monitoring and reporting systems.
Expert guides for Modbus and HART protocols
Jul 2026
Read Analysis →Jul 2026
Technical Guide →Addressing Common Queries for 4-20mA & HART Integration
Advanced Converters and Multivariable Acquisition Modules
