Digi International EZ16-A100-EU 16-Port Serial Server
The Digi International EZ16-A100-EU is a 16-port serial server engineered for industrial security, access control, and building automation deployments where legacy serial devices must integrate into modern Ethernet networks. This unit consolidates 16 serial RS-232/422/485 connections onto a single network appliance with dual 10/100/1000 Mbps Ethernet ports, eliminating point-to-point serial cable runs and enabling centralized, remote terminal access across distributed sites. Built for harsh environments with industrial-grade temperature tolerance, the EZ16-A100-EU bridges the gap between aging serial equipment—door controllers, legacy badge readers, sensor arrays, HVAC systems—and contemporary IP-based management platforms.
Key Features
- 16 Serial Ports: Full RS-232/422/485 support (configurable per port). Converts serial device output directly to Ethernet frames, eliminating dedicated serial cabling and modem banks.
- Dual Gigabit Ethernet: (2) 10/100/1000 Mbps auto-sensing ports with network redundancy capability. Supports port trunking for failover in mission-critical access control and intrusion detection systems.
- Industrial Temperature Rating: Operates across extended temperature ranges typical of utility closets, outdoor equipment enclosures, and uncontrolled server rooms without thermal derating.
- 256 MB RAM, 4 GB Flash: Sufficient on-board memory for device configuration, port buffering, and firmware updates. No external storage dependency simplifies logistics in remote deployments.
- Network-Based Management: Telnet, SSH, and web-based console access to all 16 serial ports. Eliminates physical serial console panels and enables out-of-band terminal access from anywhere on the corporate network.
- 5-Year Warranty: Factory warranty with industrial-focused support aligned to system uptime expectations in security and building control verticals.
- Compact 11.46 lb Form Factor: DIN-rail mountable; fits standard equipment enclosures alongside PDUs, switches, and controllers without dedicated rack space overhead.
The EZ16-A100-EU solves a perennial integration challenge: connecting legacy serial-only devices (card readers, motion sensors, facility controls, legacy NVRs) to IP networks without hardware replacement. Security integrators frequently encounter multi-building campuses where serial cabling is impractical or where remote commissioning and troubleshooting is essential. Rather than replace working equipment or run 500+ feet of serial cable, a single EZ16-A100-EU at each site aggregates all serial traffic onto the corporate Ethernet backbone. Dual Gigabit ports allow daisy-chaining across multiple servers on the same VLAN, distributing load and adding redundancy when paired with port failover logic.
The device supports transparent serial-to-TCP/IP tunneling, meaning legacy applications communicating with serial ports via Telnet or raw socket connections see no change in behavior—baud rate, parity, and flow control are preserved end-to-end. This compatibility eliminates software rewrites and permits gradual hardware migration: as legacy devices reach end-of-life, they can be decommissioned without touching the EZ16 infrastructure. Network-based management (Telnet, SSH, web UI) means field technicians can diagnose serial port hangs, reload configurations, and reset devices remotely—especially valuable in 24/7 security operations where physical site access is restricted or delayed.
Integration with SIEM, event logging, and NMS platforms is straightforward: the EZ16 transparently bridges serial device output (alarm states, sensor readings, authentication logs) into syslog or SNMP traps, allowing central visibility of all connected legacy equipment. Industrial-grade components and operating temperature tolerance ensure the unit remains stable in unheated utility closets, outdoor equipment shelters, and data centers with variable climate control. The 5-year warranty reflects Digi's confidence in industrial deployments; coupled with dual Ethernet ports and on-board configuration backup (4 GB Flash), total cost of ownership for serial-to-IP bridging is substantially lower than point-to-point modem solutions or device replacement.
Marty AllisonPerspective based on aggregated IP Security Depot and affiliated engineering team experience.
We've deployed Digi serial servers across hundreds of access control and intrusion systems where legacy serial devices needed IP-based management without forklift replacement. The EZ16-A100-EU is the workhorse in this category: it doesn't try to be a protocol translator or a gateway—it's a straightforward 16-port serial concentrator with network redundancy and remote console access. What differentiates it from cheaper alternatives is durability in harsh environments (industrial temperature rating matters when you're mounting in an unheated electrical room) and Digi's reputation for firmware stability over multi-year deployments. We've seen systems running the same EZ16 configuration for 8+ years without a single port failure. Compared to Moxa EDS-G508E or Lantronix Spider X, the EZ16 is narrower in feature scope but more reliable for pure serial-to-Ethernet bridging; if you need complex protocol conversion or modbus translation, look elsewhere. The trade-off is that you'll need your legacy serial devices to speak TCP/IP natively (via Telnet or raw socket), which 99% of industrial equipment does. Dual Gigabit ports and DIN-rail form factor fit seamlessly into distributed security architectures where you're deploying one EZ16 per building or floor—redundancy happens at the network layer, not at the device level.
Technical Highlights:
- 16 Independently Configurable Serial Ports: Each port can be set to RS-232, RS-422, or RS-485 with independent baud rate, parity, and flow control. This flexibility means a single EZ16 can aggregate mixed serial device types (door readers at 19200 baud, sensors at 9600) without software complexity or per-device serial-to-Ethernet converters.
- Dual 10/100/1000 Mbps Ethernet with Redundancy: Unlike single-port alternatives, dual Gigabit enables active-active load distribution or hot-standby failover. If your access control system is fed from multiple serial devices, you can hash port traffic across both network interfaces, reducing single-point failure risk and improving throughput for high-volume serial polling.
- Industrial Temperature Range: Operating spec includes 0-50°C (or wider, depending on regional variant), which is essential for outdoor electrical enclosures, unheated utility closets, and parking-lot equipment shelters. Cheaper consumer-grade serial servers derate or fail outside 15-35°C; this one doesn't.
- On-Board 4 GB Flash and Configuration Backup: Firmware updates and configuration snapshots live locally, eliminating dependency on external TFTP servers or USB dongles. If the network is down, configuration persists; if you need to factory-reset and restore, you have a local fallback.
- Transparent TCP/IP Tunneling: Legacy software communicating with serial ports via Telnet or raw TCP sockets sees no latency or protocol overhead. The EZ16 is agnostic to the application layer—baud rate and framing are preserved exactly, ensuring drop-in compatibility with 30-year-old access control systems.
Deployment Considerations:
- Legacy serial devices must support Telnet or raw TCP/IP connectivity. If your badge reader or sensor speaks only direct RS-232 (no network stack), the EZ16 alone won't bridge it—you'll need Modbus RTU or a proprietary serial-to-HTTP translator upstream.
- Network bandwidth is rarely a constraint (16 serial ports at max throughput consume <1 Mbps aggregate), but latency-sensitive real-time systems (hard real-time control loops, audio/video sync) may see microsecond-level jitter through the Ethernet hop. For access control, alarms, and sensor telemetry, this is immaterial.
- DIN-rail mounting requires a standard 35mm rail and small footprint allocation in the enclosure. Verify cable entry (bottom or side) aligns with your wiring scheme before ordering; retrofit installations often require conduit rework.
- Dual Gigabit ports are often configured on the same VLAN for simplicity, but advanced deployments may segment serial device management traffic to a separate management VLAN. Plan your network addressing upfront to avoid broadcast storms from noisy serial devices.
- 5-year warranty is hardware only; firmware updates are free, but extended technical support contracts are typically separate SKUs. Budget for optional support if this unit is critical to your access control or emergency communication chain.
The EZ16-A100-EU is the right choice for integrators and facility teams managing multi-site deployments with entrenched legacy serial infrastructure. It's not a protocol gateway or a cybersecurity appliance—it's a reliable, industrial-grade serial concentrator that lets you centralize management, eliminate cable runs, and add network redundancy to aging equipment without replacement. Explore the full Digi International catalog for other device servers, terminal servers, and IoT gateways suited to distributed and edge deployments.
