Over the past several decades, industrial networks have made significant strides towards becoming “ALL-IP”. Industrial Ethernet is mature. Yet segments of the network persist where serial datacom remains essential. SCADA, industrial-automation, energy-management, and utility networks still require RS‑232, RS‑422, and RS‑485 connections.
The relentless march toward IP network infrastructure has edged these legacy serial systems into the margins. Many solutions in use today require external converters or device servers with dedicated power supplies and additional cabling—all of which increase cost and complexity. Bulky, standalone serial device servers consume space and require separate mounting—NOT an elegant solution for serial-to-Ethernet connectivity.
The market wants a seamless solution that enables serial datacom and Ethernet/IP to coexist while providing fast, easy installation and management. For manufacturing, industrial automation, transportation systems, and energy infrastructure, one recent technological development shows promise: The new Smart-SFP solutions provide an elegant way to connect essential legacy technology with state-of-the-art IP-network architecture.
Legacy Serial Devices
Serial RS-232, RS-422, and RS-485 devices are reliable workhorses that perform critical functions. These units remain the backbone of countless industrial operations. Remote terminal units (RTUs), programmable logic controllers (PLCs), sensors, monitoring devices, and other serial‑based equipment continue to support mission‑critical processes across manufacturing, transportation, and utility sectors.
A Modern Approach to Legacy Integration
One such solution is the Connect‑IT CIT‑SFP Serial Device Server from Patton. The module consolidates traditional device‑server functionality into a compact, hot‑swappable SFP module. By plugging directly into an Ethernet switch, router, or Internet of Things (IoT) gateway, the module eliminates the need for external adapters, power supplies, and patch cables. The host device provides power, and RS‑232/422/485 support is fully software‑selectable: just plug this little widget into your Ethernet switch. The SFP module connects directly to Ethernet, draws power from the host, and VOILA! Because universal RS interface support is software selectable, you get instant universal RS-you-name-it serial connectivity. 
Versatile
Patton’s Connect-IT CIT-SFP functions as a device server, terminal server, and serial-over-IP network extender. The unit encapsulates serial data into IP packets for transport via UDP or TCP. The device supports three network architecture scenarios:
- Point-to-Point operation provides direct communication between two serial devices on the IP network over TCP or UDP.
- Point-to-Multipoint configuration enables a single device to communicate with multiple endpoints—perfect for monitoring applications that require data distribution to several destinations.
- COM Port Extension provides compatibility with third-party COM servers and applications, functioning as a virtual serial port across network infrastructure.
The CIT-SFP module supports data rates from 75 bps to 230 Kbps across all three serial standards. The tiny little widget accommodates everything from slow telemetry to high-speed industrial control.
Industrial‑Grade Performance
Designed for harsh environments, the CIT‑SFP features a durable metal enclosure and supports operating temperatures ranging from −40° to +85°C. The module includes an integrated temperature sensor and supports Digital Diagnostic Monitoring (DDM), which enables enhanced visibility and proactive maintenance.
Lowered Cost and Reduced Complexity
By eliminating external converters, power supplies, and mounting hardware, the SFP‑based approach significantly reduces CAPEX and installation time. Organizations can leverage existing Ethernet switch infrastructure to support serial connectivity, enabling rapid deployment and simplified network management.
Security features include password-protected Web, Telnet, and SSH access—plus a physical write‑protection switch that prevents unauthorized configuration changes.
Future-Proof
Whether modernizing SCADA systems, integrating factory equipment into Industry 4.0 initiatives, or building resilient critical infrastructure, seamless serial-IP connectivity provides the foundation for sustainable digital transformation without stranded investments.
Ready to simplify your serial device integration?
>>Learn more about the CIT-SFP Serial Device Server and discover how this compact solution can transform your approach to legacy device connectivity.
What do you think?
- Remember X.25? What happened to that technology?
- Will RS-whatever serial-device communication ever go extinct? Or is it indispensable?
- Does the SFP device server seem like a game-changer for your serial network?
Add your thoughts in the comments below…
