Digi International EZ08-E1G4 CONNECT EZ 8-Port Serial Device Server
The Digi International EZ08-E1G4 is an eight-port serial device server engineered for industrial environments where legacy RS-232 equipment must be integrated into modern networked infrastructure. Built with 256 MB RAM and 4 GB flash storage, this device bridges serial peripherals—meters, PLC sensors, telemetry units, building automation equipment—directly to Ethernet networks with 10/100 Mbps auto-sensing connectivity. Deployments across utilities, manufacturing, telecommunications, and building control systems rely on this class of device to extend the operational life of existing serial instruments without rewiring or hardware replacement.
Key Features
- 8 RS-232 Serial Ports: Full-duplex RS-232 connectivity on all ports. Allows simultaneous networked access to up to eight independent serial devices from a single Ethernet interface.
- Dual 10/100/1000 Mbps Ethernet (auto-sensing): Two independent Ethernet ports with automatic speed negotiation ensure redundancy and load distribution in control networks without manual configuration.
- Industrial Temperature Operating Range: Rated for industrial environments—control cabinets, outdoor enclosures, harsh field sites. Operates reliably in temperature extremes where standard commercial equipment would fail.
- Network-Based Remote Management: Access and configure all eight serial devices remotely over the network. Eliminates on-site visits for basic diagnostics and parameter adjustments on legacy equipment.
- 256 MB RAM, 4 GB Flash Storage: Sufficient onboard memory for device configuration, buffering, and local logging. Persistent storage survives power cycles without external backup.
- 5-Year Manufacturer Warranty: Extended warranty coverage reflects Digi's confidence in industrial-grade hardware reliability. Reduces capex uncertainty on long-term deployments.
- Compact Form Factor (7.1 lbs): Mounts in standard 19" rack or DIN rail in control cabinets. Minimal footprint preserves valuable equipment-room real estate.
The EZ08-E1G4 solves a recurring integration headache: legacy serial instruments (flow meters, temperature sensors, PLC I/O modules, older SCADA equipment) often cannot be replaced without major process disruption or budget impact. Rewiring each device to a central control point is labor-intensive and error-prone. A serial device server eliminates this overhead by virtualizing the serial ports over Ethernet—a single cable replaces eight dedicated serial runs, and remote operators gain full access from the control center or NOC.
Deployment scenarios include utility SCADA networks where decades-old RTU (Remote Terminal Unit) equipment sits in remote substations communicating via serial modems; manufacturing environments with legacy sensor banks wired to ancient data loggers; and building automation systems integrating older HVAC controllers or metering panels. In each case, the alternative is expensive hardware replacement; the serial server extends asset life and defers capex.
Network integration is straightforward. The device speaks industry-standard Ethernet—any modern switch with 10/100 or Gigabit ports will work. Configuration and monitoring happen via web GUI or command-line interface (CLI), no proprietary software licenses required. Serial traffic is transparent to the network layer; VMS platforms, SCADA systems, and custom applications see the server simply as a network-attached serial bridge.
Total cost of ownership heavily favors the serial device server model over point-to-point rewiring or hardware replacement. A single EZ08-E1G4 covering eight legacy devices costs less than rewiring labor and cable for a single serial run in many commercial installations. Power consumption is minimal (typical 12W), and the industrial temperature rating means no climate-control upgrades to the equipment cabinet are necessary. Pair this with a 5-year warranty, and the per-device annual failure risk is effectively zero for most deployments.
Marty AllisonPerspective based on aggregated IP Security Depot and affiliated engineering team experience.
We've deployed dozens of Digi serial device servers across utility substations, manufacturing plants, and central office equipment rooms, and the EZ08-E1G4 remains one of the most cost-effective solutions for keeping 20+ year-old serial gear online without major infrastructure overhaul. The real operational win is that you eliminate eight separate serial-to-Ethernet converters (or worse, multiple USB-to-serial adapter chains) and replace them with a single managed device that lives in your control cabinet. Dual Gigabit Ethernet ports mean you can drop the serial traffic onto a separate VLAN or even a dedicated switch port without affecting core network traffic—critical in utilities and manufacturing where network segregation is a compliance requirement. The industrial temperature rating isn't cosmetic; we've installed units in uninsulated equipment cabinets in desert heat and northern winter, and they perform identically. One caveat: the device does not include serial flow control or handshaking bypass—if your legacy equipment relies on RTS/CTS or DTR/DSR pin toggling, you must verify compatibility or configure software flow control on the target devices. In our experience, this has been a non-issue for 95% of SCADA sensors and older building automation controllers, but industrial PLC equipment occasionally requires explicit testing.
Technical Highlights:
- Dual 10/100/1000 Mbps Ethernet with auto-sensing: Older facilities often have mixed 100 Mbps and Gigabit infrastructure; the EZ08-E1G4 adapts without manual configuration. More importantly, two independent ports let you isolate serial traffic to a separate physical link, eliminating competition with other network services on a single Ethernet connection.
- 256 MB RAM + 4 GB Flash: Sufficient for local buffering during temporary network outages—serial traffic doesn't get dropped if the Ethernet flaps for a few seconds. Flash storage retains device configuration and logs across power cycles without requiring a configuration server.
- Industrial temperature (-40°C to +70°C typical): Standard commercial device servers are rated 0°C to 40°C. The EZ08-E1G4 operates in uninsulated outdoor cabinets, near furnaces, and in refrigerated spaces without derating or thermal management complexity.
- 8 full-duplex RS-232 ports: Each port operates independently at configurable baud rates (300 to 115200 bps). No shared CPU bottleneck; serial traffic from one port doesn't back up the others under load.
- Network-based remote access (telnet, SSH, web GUI): No need to physically visit the cabinet for basic troubleshooting or configuration. Remote diagnostics reduce mean-time-to-resolution on legacy serial links by 50%+ in our experience.
Deployment Considerations:
- Verify baud rate and flow-control requirements on your target serial devices before installation. Most SCADA equipment defaults to 9600 baud with software flow control; confirm this matches your setup to avoid commissioning delays.
- If your legacy equipment uses null-modem or special null-modem pinout, ensure your cables match. The EZ08-E1G4 expects standard DCE (data communications equipment) pinout on the serial side.
- Deploy on a separate VLAN or network segment if compliance or security policy requires isolation of legacy systems from modern IT infrastructure. Dual Ethernet ports make this straightforward.
- Plan for redundancy if the serial devices are critical. A second EZ08-E1G4 plus a managed switch with port mirroring gives you failover capability at minimal cost.
- Power draw is minimal (~12W typical), but confirm your cabinet PDU has sufficient capacity if you're adding multiple device servers to an already-dense installation.
The EZ08-E1G4 is the right choice when you have eight or fewer legacy serial devices, space is at a premium, and you need industrial-grade reliability in an uncontrolled environment. For larger serial deployments (16+ devices), consider stacking multiple EZ08 units or evaluating Digi's larger modular platforms. See the Digi International catalog for the complete range of device server options.
