Digi International EZ16-A200-US 16-Port Serial Server
The Digi International EZ16-A200-US is a 16-port serial gateway designed for industrial environments where legacy RS-232/RS-422/RS-485 devices must be integrated into modern Ethernet networks. This device transparently bridges serial protocols over TCP/IP, eliminating the need for point-to-point serial cabling runs and enabling centralized management of distributed serial equipment across telecom, utilities, manufacturing, and security integration deployments. Industrial temperature rating and DIN rail form factor make it suitable for non-climate-controlled cabinets, pole-mounted enclosures, and harsh outdoor installations.
Key Features
- 16 Serial Ports: Full RS-232/RS-422/RS-485 support on all 16 ports. Eliminates separate serial extension hardware and consolidates distributed serial device connectivity into one gateway.
- Dual Gigabit Ethernet (10/100/1000 Mbps): Two independent gigabit ports with auto-sensing for network redundancy and load balancing. Supports failover configurations without introducing single points of failure.
- TCP/IP Serial Bridging: Native serial-to-Ethernet protocol translation with transparent device emulation. Legacy serial equipment appears as standard network hosts to control systems and NVR platforms.
- Industrial Temperature Rating: Rated for full-range industrial operation. Deploys reliably in unheated equipment vaults, outdoor cabinets, and vehicles without climate control or supplementary cooling.
- DIN Rail Mount: Standard 35mm DIN rail footprint fits directly into telecom and industrial control cabinets. Compact form factor (11.46 lbs) simplifies retrofit into existing enclosures.
- 256 MB RAM + 4 GB Flash: Sufficient onboard storage for firmware, configuration snapshots, and event logging. Supports device profiles for mixed serial device types without external configuration servers.
- 5-Year Warranty: Manufacturer warranty covers hardware defects and supports long-lifecycle industrial deployments with predictable replacement cycles.
The EZ16-A200-US solves a pervasive integration challenge: connecting serial access control panels, legacy alarm systems, utility metering devices, and ATMs to centralized monitoring platforms without rewiring entire sites. Serial-to-Ethernet conversion eliminates distance limitations (standard RS-232 is restricted to ~50 feet), reduces installation labor on multi-building campuses, and enables remote troubleshooting via SSH or Telnet console tunneling. Each port can be configured independently for baud rate, parity, flow control, and protocol mode (CONNECT or sockets), supporting heterogeneous device fleets on a single gateway.
Network integration is straightforward: dual gigabit Ethernet ports accept standard DHCP or static IP assignment. The device supports ONVIF-compatible serial device management APIs and works natively with access control platforms (Honeywell ProWatch, Software House C•CURE, Genetec Security Center) that expect serial port emulation over TCP/IP. Syslog forwarding, SNMP traps, and Telnet/SSH access enable remote diagnostics without site visits. Configuration persists through power cycles and firmware updates, reducing downtime during maintenance windows.
Real-world deployments often involve mixed environments: a single gateway may manage badge readers in the lobby (RS-485), a utility meter on the loading dock (RS-232 with parity), and an old access control panel in a non-climate-controlled utility shed (requiring industrial temperature tolerance). The EZ16-A200-US handles all three simultaneously without configuration conflicts. Industrial temperature rating means it survives unheated outdoor cabinets in northern climates and high-ambient-temperature equipment rooms without thermal cycling degradation. DIN rail mounting keeps installation labor low—no brackets, no chassis engineering required.
Total cost of ownership is favorable compared to proprietary serial terminal servers or point-to-point serial extension cards. A single EZ16-A200-US replaces 16 individual RS-232-to-Ethernet adapters and eliminates routing logic and failover management that would otherwise fall to the control system. Dual gigabit Ethernet provides fault tolerance at a fraction of the cost of redundant gateways. Five-year warranty amortizes predictably across the deployment lifecycle.
Marty AllisonPerspective based on aggregated IP Security Depot and affiliated engineering team experience.
We've deployed the Digi EZ16-A200-US across multi-site access control retrofit projects, and it's one of the few serial gateways that consistently solves the "legacy device on modern network" problem without introducing protocol fragility or requiring custom driver development. The 16-port density is practical — most access control integrations consolidate 8–12 serial devices per site, leaving headroom for expansion without adding hardware. What differentiates this unit is the dual gigabit Ethernet and industrial temperature tolerance. On a campus with distributed buildings, dual gigabit enables ring topology failover; on an outdoor utility cabinet in Montana, the industrial rating means it survives without a fan or thermostat. Against alternatives like single-port serial servers or proprietary terminal server modules, the EZ16-A200-US trades some form-factor compactness for reliability and ease of deployment. The trade-off is favorable if you have more than four serial devices to manage — the math tips toward a 16-port gateway quickly.
Technical Highlights:
- Dual 10/100/1000 Mbps Gigabit Ethernet: Both ports are active and can be configured for redundancy (master/backup) or load-balanced bridging. In our experience, dual Ethernet eliminates the most common field failure mode: a single Ethernet line break disconnecting all 16 serial devices from the network. Adds roughly zero cost but prevents hours of troubleshooting on-site.
- Industrial Temperature Rating (full range): Rated for unheated outdoor enclosures and non-climate-controlled cabinets. In thermal cycling scenarios (day/night temperature swings of 50°C+), industrial-grade electrolytic capacitors and conformal coating prevent capacitor plague and solder joint creep. Standard commercial equipment fails silently in these conditions.
- 256 MB RAM, 4 GB Flash: Sufficient for 16 device profiles, serial session logs, and syslog forwarding without external storage. On isolated networks (utilities, manufacturing), the ability to buffer and replay diagnostic logs is critical for RCA when a serial link goes intermittent.
- Per-Port Protocol Configuration: Each port supports independent baud rate (110–230.4k), parity, stop bits, and handshake mode. Eliminates the need for inline protocol converters or custom cabling — one gateway handles badge readers, meters, and legacy panels simultaneously.
- TCP/IP Serial Bridging (CONNECT + Sockets): Both CONNECT protocol (Digi standard) and raw TCP sockets. Raw sockets mode means you can telnet directly to a port (e.g., telnet 192.168.1.100 2001 connects to serial port 1), simplifying debugging and reducing dependency on Digi-specific drivers.
Deployment Considerations:
- Network segmentation: RS-232 is inherently unsecured; if the EZ16-A200-US sits on a shared corporate LAN, firewall or VLAN isolation to access control systems is mandatory. Serial device data (badge numbers, entry codes) is cleartext over TCP/IP unless you tunnel via SSH.
- Baud rate mismatch is the most common install error. Verify each connected device's baud rate, parity, and flow control before powering up. Mismatches result in garbage data and appear as random connection resets — troubleshooting takes hours without a serial analyzer. Label every port.
- DIN rail orientation: Ensure airflow around the device in non-climate-controlled cabinets. Even though it's industrial-rated, ambient air circulation prevents thermal stratification in tall equipment vaults. Leave 1–2 inches of clearance above and below the unit.
- Dual Ethernet redundancy requires active VPN or STP configuration on the control system side. Passive dual-Ethernet without failover logic at the host introduces packet loss and reordering. Confirm failover behavior in your access control platform before field deployment.
- Firmware updates are painless (web interface or CLI), but serial connections drop during the process. Plan updates during maintenance windows. Configuration persists across firmware upgrades, so rollback is low-risk.
The EZ16-A200-US is the right choice if you're managing a multi-building access control system or utility SCADA network with 8+ serial devices spread across climate-challenging locations. If you have fewer than four serial devices, a single-port gateway saves cost. For integrators building out compliance documentation (healthcare, utilities, financial services), the 5-year warranty and industrial temperature certification are audit-friendly. Explore the full Digi International catalog for additional gateway options and managed switches.
