Explore our premium line of high-performance RS485 Modbus converters, multivariable signal transmitters, and HART smart modems engineered for rugged field conditions.
Precision data acquisition unit engineered by leading China suppliers for seamless analog-to-digital signal conversion in industrial settings.
Learn More
High-precision 485 to 4-20mA multivariable converter operating on standard Modbus Protocol for robust industrial process control loop systems.
Learn More
High-performance protocol converter enabling seamless bi-directional communication between Modbus RTU (RS485) and HART field instruments.
Learn More
Reliable HART to Modbus RTU smart signal converter designed for DIN-rail mounting, integrating field legacy devices with modern PLC frameworks.
Learn More
Compact USB-to-HART modern calibrator for field configuration, troubleshooting, and direct calibration of complex industrial smart transmitters.
Learn More
Robust field converter transforming complex HART multi-drop data strings into accessible Modbus registers via isolated RS485 communication line.
Learn More
Enterprise-grade multi-channel high density data logger converting multi-drop HART signals into standard Modbus-TCP and RTU protocols.
Learn More
Designed by factory experts to optimize space, mapping up to 16 dynamic channels of intelligent instrumentation to digital TCP networks.
Learn MoreIn the era of the Industrial Internet of Things (IIoT), real-time access to field data is the cornerstone of operational efficiency, predictive maintenance, and energy management. The RS485 Ethernet Gateway stands as a critical bridge. It connects standard industrial legacy devices operating over EIA/TIA-485 interfaces (using protocols like Modbus RTU or ASCII) with modern, high-speed Ethernet infrastructure (operating over Modbus TCP/IP, MQTT, or OPC UA). For control engineers and system integrators worldwide, procurement of these devices requires selecting hardware that offers not just protocol conversion, but also superior electro-magnetic compatibility (EMC), industrial isolation, minimal processing latency, and long-term hardware reliability.
As factories transition from centralized DCS (Distributed Control Systems) to edge-computed architectures, gateways must deliver higher performance. The challenge is no longer simple transparent transmission. Instead, it is the optimization of bandwidth, security of data packets, and concurrent master-client scheduling in multi-node configurations. This white paper details how modern engineering advancements resolve these challenges, making the transition seamless and future-proof.
Support for multi-channel configuration, enabling a single IP address to map and retrieve registers from dozens of sub-devices smoothly, reducing system design complexity.
Integrates advanced packet filtering, industrial-grade static isolation protection, and robust security protocols to prevent operational disruptions and hacking.
Optimized packet packing algorithms with microsecond-level switching time between serial frames and Ethernet packets, eliminating transmission bottlenecks.
The industrial serial-to-Ethernet device market is witnessing rapid technological advancement, driven by three major macro trends:
Established in 2007, Jiaxing Songmao Electronics Co., Ltd. is a premier high-tech enterprise dedicated to the R&D, manufacture, and global distribution of advanced industrial automation and communication solutions. Under our flagship brand, we specialize in high-performance HART protocol converters, data collectors, serial device servers, and multivariable protocol gateways.
Through 18+ years of strict quality control and persistent technological breakthroughs, we have positioned ourselves as an authoritative partner for engineering groups in more than 40 countries. Our advanced manufacturing facility and highly qualified R&D team enable us to provide OEM/ODM customization, ensuring compatibility with major global automation platforms.
Providing robust, compliant, and highly efficient network bridging solutions across critical global industries.
Every industry poses specific physical challenges to connectivity. Our customized gateways resolve these directly:
For global procurement managers and sourcing leads, buying RS485 to Ethernet gateways involves assessing more than just the baseline price. Operational downtime in automated facilities can cost thousands of dollars per minute. Therefore, evaluating reliability through specific metrics is essential:
Ensure the hardware design has built-in 15KV ESD protection for all serial signals, 1.5KV magnetic isolation protection for the RJ45 Ethernet ports, and at least 3KV galvanic power isolation. This isolates surge current spikes caused by heavy motor switching or ground loops from frying the main microcontroller.
A high-quality gateway must support diverse modes: Virtual COM port drivers (with multi-installation support for Windows/Linux), TCP Server, TCP Client, UDP, and Modbus Gateway (RTU to TCP conversion). Virtual COM mapping allows legacy Windows software to talk to network-connected gateways as if they were physical serial cards plugged into the PC.
Compliance is critical for hassle-free custom clearance and workplace safety. Our factory operates under strict ISO 9001:2015 frameworks, verifying that our serial servers, USB to HART modems, and protocol converters adhere to CE (EMC & LVD), FCC Part 15 Class B, and RoHS standards.
Looking ahead, the industrial network landscape is changing. Songmao is continuously innovating to support these paradigms:
Resolving common design, configuration, and deployment queries for industrial serial-to-Ethernet applications.
Transparent transmission passes raw serial bytes directly into the TCP payload without parsing. Modbus Gateway mode actively intercepts and converts the packet headers. It translates Modbus RTU frames (which include a CRC checksum) into Modbus TCP frames (which replace the CRC with an MBAP header) on the fly, allowing PLCs to interact directly with the RS485 network.
Under standard conditions without repeaters, up to 32 nodes can be linked due to transceiver loading characteristics. By utilizing high-input impedance transceivers, our units can drive up to 128 nodes. However, proper bus termination resistors (120 ohms at the end-of-line) and shielding are necessary to avoid signal degradation.
Yes. HART signals are superimposed onto the analog 4-20mA current loop using Frequency Shift Keying (FSK) without affecting the basic analog control loop. Our multi-channel HART collectors read the high-frequency HART digital data without corrupting the 4-20mA analog signal, allowing you to acquire both process variables concurrently.
Our smart gateways feature internal queue managers. If two or more SCADA masters request data simultaneously, the gateway queues the TCP requests, serializes them over the half-duplex RS485 bus, waits for the responses, and returns the data back to the correct TCP client, preventing frame collisions.
Deploying gateways with optical isolation is the most effective solution. By separating the transceiver side from the internal CPU using optocouplers and isolated power supplies (typically up to 3KV isolation), differences in ground potential between nodes are blocked, preventing current flow across the signal lines.
Yes, we provide compatible virtual serial driver utilities for all major operating systems. This utility installs a virtual COM port (e.g., COM5) in the system's device manager, mapping it to the IP address and TCP port of the gateway. The legacy program functions as if it were directly connected to a serial card.
Stay updated with our technical guides, communication protocols tutorials, and recent industrial news.
MODBUS TCP (Transmission Control Protocol) is a widely used serial communication protocol in industrial automation systems, enabling reliable device networking.
In industrial automation, intelligent instruments, PLC control systems, and IoT data collection, Modbus protocol remains the absolute foundational standard.
Providing specialized serial servers, multi-channel distributors, and multi-protocol modems to complete your plant architecture.
Designed for complex multi-node systems requiring isolated splitter channels to distribute Modbus RTU communications stably.
Learn More
Dual serial-port device server facilitating high-speed, reliable TCP transmission for legacy RS232 and RS485 physical links.
Learn More
Rugged data logging terminal integrating GPRS, 4G cellular bands, and Modbus protocol to manage transmission in remote fields.
Learn More
Enterprise factory-level data acquisition interface card facilitating seamless integration of multiple HART instruments with TCP controllers.
Learn More
Premium series HART smart converter configured to communicate efficiently, serving as the bridge to standard Modbus networks.
Learn More
Rugged 8-channel DIN-rail data acquisition module mapping multi-point HART transmitters to Ethernet networks via RTU/TCP.
Learn More
Bidirectional protocol bridge matching RS485 Modbus commands to HART field networks, ideal for petrochemical applications.
Learn More
Trusted industrial-grade converter for multi-drop automation networks, manufactured under strict quality controls.
Learn More
