Smooth Migration from Serial to IP: A Future-Proof Solution with Nessum
Many devices in existing buildings and facilities still rely on legacy serial communication protocols such as Modbus RTU. At the same time, newly added equipment—including BMS controllers, sensors, AI cameras, and IoT gateways—are typically IP-based. While serial communication wiring is often already installed (frequently routed through conduits or embedded in walls), rewiring for Ethernet is difficult and costly. Furthermore, serial communication has limitations in terms of scalability and transmission speed.
Nessum’s Ethernet and serial bridging functionality offers an effective solution to these challenges, enabling a seamless transition to IP-based networks without abandoning the existing serial infrastructure.
Limitations of Traditional Ethernet Extenders
One conventional solution is the Ethernet extender, which transmits high-frequency signals over existing wiring without interfering with ongoing serial communication. However, most Ethernet extenders only support point-to-point connections. This makes them suitable for connecting a single IP device, but not ideal for integrating multiple IP devices over a shared serial cable.
Nessum’s Unique Approach
Nessum’s core functionality is Ethernet bridging. The entire Nessum network operates like a Layer 2 (L2) switch, where each Nessum device functions as a port of the switch. When an Ethernet device is connected to a Nessum node, Ethernet packets are automatically bridged across the network—without any configuration—just like a plug-and-play L2 switch.
In addition to Ethernet bridging, Nessum also supports serial bridging. Data received on the serial port is encapsulated into Ethernet packets and routed to the appropriate destination address, using the same mechanism as Ethernet bridging. This dual-bridging capability allows serial and IP devices to operate simultaneously over the same physical cable.
From a topology standpoint, Nessum’s multi-hop capability and OFDM-based modulation enable communication over existing serial communication cables—even in free topology. While high-frequency communication (in the MHz range) typically faces challenges like signal reflections and attenuation at cable branches, Nessum is specifically designed to overcome these issues. This makes it highly suitable for retrofitting and expanding networks without the need for new wiring.
By simply attaching Nessum devices to existing serial endpoints, new IP devices can be added alongside legacy serial devices with no service interruption. While there is an initial cost to install Nessum devices, the result is a hybrid architecture that supports gradual, step-by-step migration from serial to IP communication.
To enhance security, Nessum also applies AES-128 encryption to all communications. This significantly improves the protection of serial communication lines, which are typically unencrypted and vulnerable to interception or tampering.
Conclusion
Nessum offers a practical and future-ready solution for bridging legacy serial systems with modern IP networks. Its plug-and-play Ethernet and serial bridging, flexible topology support, and built-in encryption make it ideal for facilities seeking to modernize without the disruption and cost of rewiring. Whether you’re planning a gradual upgrade or preparing for large-scale digital transformation, Nessum provides a reliable and secure migration path from serial to IP.
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About the Author
Kengo Tamukai is a senior engineer specializing in wired and wireless communication technologies. With over 20 years of experience in LSI design, system architecture, and technical marketing, his expertise spans SoC design, OFDM-based technologies, and hybrid communication systems, driving innovation in modern digital networks.
