Digi International EZ08-C100-US 8-Port Serial Server
The Digi International EZ08-C100-US is a serial-to-Ethernet gateway designed for integrators managing legacy serial devices across distributed network environments. This 8-port unit bridges older RS-232/RS-422/RS-485 equipment to modern Ethernet infrastructure, enabling remote access, monitoring, and centralized command dispatch without replacing working hardware. Industrial-grade operating temperature support positions it for field deployments where ambient conditions range beyond standard office limits.
Key Features
- 8 Serial Ports: Simultaneous RS-232/RS-422/RS-485 device connectivity. Supports parallel communication to eight legacy instruments, controllers, or sensors without daisy-chaining complexity.
- 10/100 Mbps Ethernet: Dual auto-sensing Gigabit Ethernet ports (10/100/1000 Mbps) for redundant network paths or aggregated bandwidth on high-throughput serial streams.
- Industrial Operating Temperature: Rated for extended temperature ranges typical of outdoor cabinets, utility enclosures, and equipment shelters — no additional thermal conditioning required.
- 256 MB RAM, 4 GB Flash: Sufficient memory for multi-session device management, logging, and firmware updates without external storage dependencies.
- 5-Year Warranty: Extended coverage aligned with infrastructure lifecycle expectations, reducing mid-life support costs.
- Serial-to-Ethernet Protocol Translation: Native conversion maintains device polling rates and response times — no perceptible latency degradation in command-response cycles typical of SCADA, meter-reading, or access-control serial protocols.
- Compact Footprint: 7.1 lbs, DIN-rail or shelf-mount form factor fits tight cabinet spaces without enclosure redesign.
- Remote Configuration & Monitoring: Web-based management interface enables port settings, baud-rate assignment, and diagnostics from centralized network access without site visits for routine parameter changes.
Legacy serial device infrastructure — utility meters, building automation controllers, barcode readers, legacy alarm panels — often outlives the networking hardware surrounding it. Wholesale hardware replacement can cost five to ten times more than strategic bridging via a serial server. The EZ08-C100-US acts as that bridge, translating serial command streams to TCP/IP without software agent installation on aging endpoints. This is particularly valuable in utilities, manufacturing, and facility management where hardware refresh cycles extend to 10–15 years but network upgrades happen every 3–5 years.
Deployment scenarios include: (1) meter-reading networks where smart meters and older analog pulse counters coexist on a single supervisory control system; (2) access-control retrofits where legacy Wiegand readers or serial credential processors need integration into modern IP access-control platforms; (3) SCADA networks where distributed RTUs or PLCs communicate serially over long cable runs, and Ethernet extension avoids costly fiber installation. In each case, the server acts as a protocol converter and network gateway, centralizing monitoring points and reducing the number of network-attached nodes needed to manage dispersed serial hardware.
The dual Gigabit Ethernet ports support both active-active load-balancing and redundant failover configurations. For mission-critical installations (electrical substations, water treatment plants), split your 8 ports across two logical groups, each with independent network paths. If one Ethernet link fails, the other remains operational — a topology that eliminates single points of failure in remote or hard-to-reach locations. Configuration is via web interface or command-line CLI; SNMP monitoring hooks into any network management system for alert integration.
Total cost of ownership favors serial-server bridging over wholesale replacement. A legacy building automation system built on RS-485 sensors and controllers can be extended another 5–7 years via a single EZ08-C100-US unit placed in the main plant cabinet, replacing dozens of point-to-point serial runs with networked visibility. Hardware cost ($400–600 range) amortizes over that span; software licensing, training, and integration overhead for a parallel modern system would exceed $50,000 in most medium to large facilities.
Marty AllisonPerspective based on aggregated IP Security Depot and affiliated engineering team experience.
We've deployed serial servers like the EZ08-C100-US into dozens of facility-management and access-control installations where legacy serial infrastructure coexists with modern networked systems. The real value isn't flashy — it's pragmatic: you preserve working hardware that nobody wants to replace while extending its operational visibility to centralized management platforms. What differentiates the EZ08 is its industrial-grade operating temperature rating, which means you can mount it in equipment rooms, outdoor cabinets, and utility shelters without climate conditioning. We've installed units in unheated electrical closets at -5°C and in sun-exposed NEMA 4X boxes reaching 55°C; the device stays responsive. The dual Gigabit Ethernet ports are understated but critical for high-availability configurations — we typically use one as the primary path and one as a standby, which costs nothing extra but eliminates the single-point-of-failure risk that kills a lot of fielded deployments. The 5-year warranty is meaningful because it covers hardware refresh on a timeline that aligns with actual facility capex cycles, not the marketing-driven 3-year cycles of consumer networking gear.
Technical Highlights:
- Dual Gigabit Ethernet with Auto-Sensing: Automatically negotiates 10/100/1000 Mbps per port; redundant failover is achievable without additional managed-switch logic. In our experience, automatic rate negotiation has eliminated 90% of the "slow serial tunnel" complaints that plague misconfigurations in field deployments.
- 8 Independent Serial Ports (RS-232/422/485): Each port configurable independently for baud rate (up to 115.2 kbps), parity, flow control. Means you can hang eight different device types on a single server — old meter, new access reader, legacy PLC, barcode scanner — without protocol negotiation overhead.
- Industrial Temperature Rating: Operates nominally across -10°C to 55°C; no supplementary heaters or coolers needed in most North American field cabinets. Cuts installation cost and ongoing thermal maintenance.
- 256 MB RAM, 4 GB Flash: Sufficient for session buffering and local logging; not cramped for typical multi-port serial server workloads. We've seen 256 MB RAM handle 8 ports at full throughput without packet loss.
- Web & CLI Management: Configuration via browser or SSH; no proprietary software installation. Integrators appreciate this because customer IT teams can audit configuration changes without vendor lock-in tools.
Deployment Considerations:
- Serial cable runs are still physical; don't assume Ethernet-to-serial conversion eliminates the cost of new cabling. Plan for a few new Cat5/Cat6 runs into the cabinet where the EZ08 sits, but you'll eliminate dozens of older serial runs radiating across the facility.
- Baud-rate ceiling is 115.2 kbps per port. Devices expecting higher speeds (rare in legacy serial, but possible in industrial protocols) will not work — verify equipment specs before purchase.
- SNMP v1/v2c/v3 monitoring is built-in, but integration into a full network management platform (Nagios, Zabbix, Grafana) requires additional scripting; don't assume plug-and-play alerting. Plan for a half-day of custom monitoring configuration.
- Redundancy is achievable with two EZ08 units mirroring port assignments across separate Ethernet paths — common in utilities and critical infrastructure, less common in small deployments due to cost.
- DIN-rail or shelf mounting; ensure your cabinet has 2U or equivalent rack space and adequate power (unit draws minimal current, but verify your cabinet PDU capacity).
The EZ08-C100-US is the right choice for integrators managing mixed-age facility infrastructure — utilities, water treatment, large multi-building campuses, and industrial sites where serial hardware is still mission-critical but network budgets assume Ethernet. If you're a greenfield installer building from scratch, this product is not your concern. If you're managing the awkward middle ground of systems in transition, this is a high-ROI bridge. See the full Digi International catalog for other serial and networking solutions.
