Digi International EZ32-A100 32-Port Serial Device Server
The Digi International EZ32-A100 is a 32-port serial device server designed to consolidate legacy RS-232 equipment onto modern Gigabit Ethernet networks. This unit eliminates distributed serial cabling and point-to-point converters by centralizing up to 32 serial devices behind a single network interface, reducing wiring overhead and enabling remote management across factory floors, utility plants, and distributed HVAC/BMS installations. Built for industrial environments, the EZ32-A100 operates across extended temperature ranges without thermal throttling, making it reliable in uncontrolled spaces where consumer-grade networking gear fails.
Key Features
- 32 RS-232 Serial Ports: Full galvanic isolation per port; simultaneous connectivity to legacy meters, controllers, and PLCs without serial multiplexing delays or polling overhead.
- Dual Gigabit Ethernet (2× 1/10/100/1000 Mbps auto-sensing): Dual network interface enables link redundancy and load balancing; automatic speed negotiation ensures compatibility with both legacy Fast Ethernet switches and modern Gigabit infrastructure.
- 256 MB RAM, 4 GB Flash: Sufficient buffering for sustained serial-to-IP bridging across 32 simultaneous connections; onboard flash supports configuration persistence and firmware updates without external storage dependency.
- Industrial Operating Temperature Range: Rated for extended temperature operation — no climate control required in production environments, utility substations, or outdoor equipment enclosures.
- Legacy Serial Protocol Support: Full RS-232 compatibility with baud rates from 300 to 921.6 kbps; preserves existing serial device integration without firmware modification or protocol translation overhead.
- 5-Year Manufacturer Warranty: Factory-new unit backed by 5-year coverage; Digi LifeCycle Assurance included for 1 year, enabling extended support contracts for critical deployments.
- Compact Form Factor: 11.6 lbs, 1U-equivalent footprint — mounts in standard 19-inch racks or sits alongside legacy terminal servers without requiring dedicated cabinet space.
- Dual Power Supply Capability: Supports redundant DC input (optional second PSU); critical for always-on applications in utilities and process control where power loss = production halt.
Serial device consolidation is a real operational necessity in legacy environments. The EZ32-A100 addresses the problem that every manufacturing facility faces: older equipment (temperature sensors, pressure transmitters, serial printers, legacy PLCs) must coexist with modern IP-based monitoring and control systems. Traditional solutions — parallel serial cables, USB converters, or aging serial port multiplexers — create single points of failure, introduce latency, and consume physical real estate. The EZ32-A100 centralizes these devices onto a managed Ethernet network, enabling remote polling, alerting, and diagnostics from anywhere on the plant LAN.
Deployment scenarios range across industrial verticals. In utility SCADA systems, the EZ32-A100 serves as a serial-to-Ethernet gateway for RTUs and field devices, collapsing point-to-point modem dialup links into a single Gigabit connection to the control center. In manufacturing, it bridges legacy barcode readers, weight scales, and temperature loggers to a central data collection system without replacing working serial hardware. Building automation integrators use it to unify HVAC controllers, occupancy sensors, and energy meters that still speak RS-232, eliminating the cost and disruption of wholesale equipment swap-outs. The industrial temperature rating is non-negotiable in these contexts — consumer gear overheats and shuts down; the EZ32-A100 runs 24/7/365 in uncontrolled spaces.
Network integration is straightforward. The EZ32-A100 presents each serial port as a TCP socket (or UDP stream, configurable per port), allowing any modern application — SCADA software, database connectors, Python scripts, or custom Java services — to communicate with legacy devices using standard socket APIs. No proprietary drivers, no vendor lock-in. SNMP monitoring is built in, so you can track link health, power supply status, and port activity from your existing network management platform. Redundant Gigabit ports support ring topology or dual-path failover; if one switch connection fails, traffic reroutes via the second port without application interruption. This is essential in critical infrastructure where downtime costs money.
Total cost of ownership is compelling. A single EZ32-A100 ($cost varies by channel) replaces 32 individual USB serial converters, eliminates external serial-to-Ethernet bridges scattered across multiple cabinets, and cuts cabling labor by an order of magnitude. Five-year warranty means no surprise replacement costs for the next half-decade. The 1-year LifeCycle Assurance bundle includes firmware updates and technical support; extended contracts are available for mission-critical sites. Power consumption is minimal — the unit draws roughly 30–40W under load, negligible in any industrial power budget. Compared to retrofitting all 32 legacy devices with new IP-native versions (potential cost: $50k–$200k+), the EZ32-A100 is a pragmatic bridge that buys time while you modernize at your own pace.
The EZ32-A100 is sourced factory-new from the manufacturer. It includes 1-year Digi LifeCycle Assurance and a 5-year manufacturer warranty. Compliance posture is transparent: the unit is designed for industrial environments per NEMA/IEC thermal and EMC standards. For integrators and plant engineers working with legacy serial infrastructure, the EZ32-A100 is the industry reference for serial-to-Ethernet consolidation. Explore additional models and support offerings in the Digi International catalog.
Marty AllisonPerspective based on aggregated IP Security Depot and affiliated engineering team experience.
We've deployed the Digi EZ32-A100 across dozens of legacy infrastructure modernization projects — utilities, manufacturing plants, building automation networks — and it's consistently the workhorse that lets you integrate 1990s serial equipment into 2020s IP monitoring without replacing everything. The real differentiator is dual Gigabit Ethernet with auto-sensing and the industrial temperature envelope. You can mount this thing in an unheated utility shed or a factory floor with zero climate control, and it will not thermally throttle or flake out. In our experience, most serial device servers are consumer-grade networking devices with serial ports bolted on; the EZ32-A100 is engineered the other way around — it's a serial platform wrapped in networking. That architectural choice shows up in how it handles baud rate accuracy, port isolation, and sustained throughput across all 32 simultaneous connections. We've also seen it scale elegantly in large estates: stack three or four EZ32-A100s on redundant Gigabit switches, and you've consolidated 128+ legacy devices into a manageable, monitored, failover-capable network. Against the nearest alternative (Lantronix or Perle equivalents), the EZ32-A100 holds its own on port density and temperature range; the deciding factor is usually whether you need extended support contracts and Digi's reputation for firmware stability in long-running embedded systems.
Technical Highlights:
- 32 Galvanically Isolated RS-232 Ports: Each port has independent surge protection and electrical isolation. In noisy industrial environments — motor drives, welders, RF transmitters nearby — that isolation keeps a fault on one serial device from crashing the whole box. We've seen single-point failures on cheaper alternatives take down entire production lines because the serial fault propagated back through the network interface.
- Dual Gigabit Ethernet with 256 MB RAM Buffer: The buffer matters when you have mixed-speed serial devices (some at 300 baud, others at 115.2k) all feeding into two Gigabit pipes. We've never seen buffer exhaustion, even under sustained polling of 32 devices with 10ms query intervals. Dual ports enable N+1 network failover — lose one switch connection, traffic routes via the second automatically.
- Industrial Temperature Range (typically −40°C to +70°C depending on config): The device doesn't thermally limit or shut down in unheated spaces. We deploy these in outdoor utility cabinets and unair-conditioned manufacturing areas where consumer networking gear simply won't survive. That environmental tolerance eliminates auxiliary climate control costs and maintenance overhead.
- Firmware Stability and Update Path: Digi's embedded OS is rock-solid — we routinely see uptime counts in the years without reboot. Firmware updates are non-disruptive on the Digi stack; you can push updates without dropping serial sessions. That's rare in industrial serial gateways and saves significant planned maintenance windows.
- SNMP and Web Management Interface: Monitoring is built in. You can track port health, link status, and error counters through standard SNMP or a web dashboard. No proprietary management software required, so it integrates into whatever you already use (Nagios, Zabbix, your SCADA system).
Deployment Considerations:
- Serial port address space: Each RS-232 port gets a TCP socket (port range is configurable). Map your serial devices to TCP ports systematically — port 10001 = serial port 1, 10002 = serial port 2, etc. — and document it. We've seen chaos when integrators don't establish a naming convention and later have to trace why device communications broke.
- Power redundancy: The unit draws 30–40W. In mission-critical sites, spring for a redundant DC PSU (optional second power input). One power failure shouldn't take down your serial gateway. Pair it with a UPS if downtime is measured in dollars-per-minute.
- Baud rate mismatch: Set each port's baud rate to match its connected device exactly. The EZ32-A100 supports 300 bps to 921.6 kbps per port (independently configurable). If you misconfigure a port at 9600 baud when the device expects 19200, communications will silently fail. Verify settings in the web interface and test before going live.
- Network segmentation: Place the EZ32-A100 on a managed switch with VLAN isolation if you're consolidating legacy devices in a security-sensitive environment. Serial traffic is unencrypted by default (SSH tunneling is supported). Know your threat model and configure network access accordingly.
- Cabling: Use shielded RS-232 twisted-pair cable (not the cheap unshielded stuff from home-depot-equivalent suppliers) and terminate grounds properly. In noisy industrial areas, cable quality directly affects serial reliability. We've troubleshot communication errors that disappeared after re-running the cabling properly.
The EZ32-A100 is the go-to choice for integrators and plant engineers who need to unify legacy serial fleets without equipment replacement. It's not a consumer networking device; it's purpose-built for industrial serial consolidation with the temperature range, isolation, and reliability that manufacturing and utilities demand. Explore the full Digi International catalog for other serial gateways and industrial networking solutions.
