Digi International EZ32-A100-EU 32-Port Serial Server
The Digi International EZ32-A100-EU is a 32-port serial server designed for industrial environments requiring consolidation and network accessibility of legacy serial devices and sensors. This unit bridges disconnected serial infrastructure—PLCs, meters, sensors, RTUs, legacy modems—into a centralized TCP/IP network, enabling remote monitoring and control without replacing installed hardware. Industrial temperature rating and dual Gigabit Ethernet ports make it suitable for manufacturing floors, utility SCADA deployments, telecom installations, and distributed facility control systems where uptime and environmental resilience matter.
Key Features
- 32 Serial Ports: DB-9 or RJ-45 connectors consolidate three dozen legacy serial devices into a single network appliance. Eliminates the operational overhead of managing scattered terminal servers across a site.
- Dual Gigabit Ethernet (10/100/1000 Mbps auto-sensing): Redundant network connections support failover and load distribution. Auto-negotiation simplifies integration into mixed-speed networks.
- Industrial Temperature Rating: Operates reliably in 0–50°C environments without derating—critical for uncontrolled factory floors, outdoor enclosures, and telecom huts.
- 2 GB RAM, 8 GB Flash: Sufficient onboard memory for session buffering, protocol conversion tables, and firmware updates without external storage dependency.
- Remote Management & Monitoring: SSH, Telnet, web-based console access allow remote configuration and troubleshooting—reduces truck rolls and MTTR for geographically dispersed deployments.
- Legacy Protocol Support: Modbus, DNP3, Profibus, and transparent serial forwarding enable integration with older industrial control systems without protocol translation middleware.
- 5-Year Warranty: Extended warranty coverage reduces lifecycle risk on long-term SCADA and utility installations where replacement cycles span decades.
Serial-to-Ethernet bridging is foundational in utility, manufacturing, and telecom environments where rip-and-replace of legacy RTUs and control devices is economically or operationally unfeasible. The EZ32-A100-EU consolidates sprawling serial networks into a single, manageable appliance. With 32 ports, it replaces multiple single- or dual-port terminal servers, reducing power consumption, rack space, and configuration complexity. The dual Gigabit Ethernet ports and industrial temperature rating ensure the server itself doesn't become a bottleneck or point of environmental failure in critical infrastructure deployments.
Network integration is straightforward: any device capable of TCP/IP socket communication (SCADA master, historian, remote diagnostics platform, or custom application) can connect via standard Ethernet and establish serial sessions to legacy equipment. Transparent serial forwarding means the server doesn't require knowledge of Modbus, DNP3, or proprietary protocols—it simply forwards raw byte streams, preserving command syntax and timing. This simplicity accelerates integration timelines and reduces training burden on field technicians unfamiliar with serial protocol details.
Operational resilience is built in. Dual Ethernet ports enable active-active or active-standby network configurations; industrial temperature specification eliminates the need for auxiliary cooling or thermal enclosures on most factory and outdoor installations. The 2 GB RAM buffer handles temporary network latency or reconnection events without dropping serial data—essential for real-time sensor streams and command-response cycles in power generation, water treatment, and chemical manufacturing. SSH and web console access allow you to diagnose and reconfigure the server remotely, reducing emergency response times when a legacy device connection fails.
Compliance and support: The EZ32-A100-EU carries a 5-year manufacturer warranty and is widely deployed in SCADA-critical verticals (utilities, telecom, industrial automation) where parts availability and firmware longevity matter. Digi's serial-server lineage is decades-long; existing integrations and reference architectures are abundant. If you're modernizing a SCADA network, facility control system, or utility metering infrastructure, this appliance is a proven cost-effective path to network-enabled remote management without capital-intensive legacy device replacement. See the Digi International catalog for related connectivity products.
Marty AllisonPerspective based on aggregated IP Security Depot and affiliated engineering team experience.
We've deployed the Digi EZ32-A100-EU across utility substations, manufacturing control centers, and telecom cabinets for over a decade. The real value here isn't flashy—it's survival. Legacy SCADA networks don't disappear overnight; they're replaced incrementally, and the EZ32 bridges that gap without forcing operators to rewrite control logic or replace millions of dollars in installed serial hardware. The 32-port density is the primary differentiator versus competitors' 16- or 8-port models: you're consolidating one rack appliance instead of four, which cuts power draw, cooling demand, and management overhead. On a 500-node utility metering network, that's material capex and opex savings. The dual Gigabit Ethernet ports aren't redundancy theater—they're deployable in active-active configurations where you can load-balance traffic or failover transparently if a switch port fails. We've seen this prevent unplanned SCADA blackouts in water districts where a single serial connection failure cascaded into monitoring blind spots for hours. Industrial temperature rating is similarly practical: in outdoor telecom shelters and uncontrolled factory floors, you don't need auxiliary cooling or environmental monitoring. The server just works.
Technical Highlights:
- 32 Serial Ports with Transparent Forwarding: No protocol translation layer—raw byte-stream forwarding preserves Modbus, DNP3, and proprietary command timing. This eliminates a common failure mode: garbled checksums or timing violations that plague gateway-based serial conversions. Field technicians can debug serial issues with standard serial analyzers, not vendor-proprietary tools.
- Dual 10/100/1000 Mbps Gigabit Ethernet: Auto-negotiation accommodates both legacy 100 Mbps switches and modern Gigabit infrastructure. Active failover capable—set up one port on Subnet A and one on Subnet B for transparent mesh redundancy. On large SCADA networks, this prevents the serial server itself from becoming a single point of failure.
- 2 GB RAM and 8 GB Flash: Onboard buffering handles transient network outages (a few seconds to a few minutes) without data loss—critical for burst sensor streams or rapid-fire control commands. Flash storage is sufficient for multiple firmware versions and persistent configuration, reducing dependency on external management systems during initial deployment.
- SSH, Telnet, Web Console Access: Out-of-band management via a secondary Ethernet port or cellular uplink is possible. You can reconfigure or troubleshoot the server remotely without physical access—important for distributed utilities or offshore installations.
- Industrial Temperature (0–50°C): No thermal derating, no auxiliary cooling. Typical competitive serial servers spec only 0–40°C; at 45°C ambient (common in factory floors), they throttle or fail. This unit holds full performance to 50°C.
Deployment Considerations:
- Serial port configuration (baud rate, parity, flow control) must match the legacy device exactly. The server doesn't auto-detect settings; each port is configured independently via SSH or web console. Budget 1–2 hours for initial port mapping and validation, especially on heterogeneous networks mixing 9600 baud modems with 38400 baud PLCs.
- Dual Ethernet setup requires careful VLAN and routing planning if you're using active-active failover. A misconfigured redundant network can create switching loops or duplicate serial sessions. Work with your network team to validate the topology before field deployment.
- The EZ32 is a serial-to-IP bridge, not a protocol gateway. If your SCADA master expects Modbus TCP but your RTU speaks Modbus RTU (serial), you still need a Modbus gateway or middleware—the EZ32 won't translate. It will, however, let you run Modbus RTU over Ethernet, which is sometimes sufficient for legacy network extensions.
- Power consumption is modest (~20–30W typical), but when deploying 32 serial connections in an outdoor cabinet, plan for UPS or backup power. A single serial device failure (e.g., a shorted transmit line) can occasionally reset the port or trigger firmware watchdog; onboard UPS prevents cascading failures if the cabinet loses mains power during recovery.
- Firmware updates are available from Digi's support portal. Older deployments may be running End-of-Life code; validate firmware version at survey stage and budget time for updates. The 8 GB flash supports dual-partition firmware, so you can stage an update without losing the running image—lower risk than many legacy appliances.
The EZ32-A100-EU is the right choice for integrators and utilities modernizing SCADA networks incrementally, consolidating scattered serial infrastructure into a single appliance, or extending the operational life of legacy control hardware while phasing in IP-native replacements. This is a proven, boring, reliable product that solves a specific industrial problem well. See the Digi International catalog for related serial and networking solutions.
