Digi International EZ16-C100-US 16-Port Serial Server
The Digi International EZ16-C100-US is a 16-port serial-to-Ethernet server designed for security integrators and systems integrators managing distributed legacy serial devices in industrial environments. The unit bridges aging RS-232/422/485 equipment—access control panels, encoder devices, telecommunications interfaces, industrial controllers—to modern IP networks, eliminating the need for serial port cards in centralized servers and enabling remote device management across geographically dispersed sites. Industrial-grade temperature rating and dual Gigabit Ethernet connectivity support mission-critical deployments where uptime and accessibility are non-negotiable.
Key Features
- 16 Serial Ports: Full RS-232/422/485 support on all 16 ports. Enables parallel device connectivity without cascading hubs or external multiplexers.
- Dual Gigabit Ethernet (10/100/1000 Mbps, auto-sensing): Two independent RJ45 ports allow redundant network paths or separate control and data traffic segregation. Auto-negotiation eliminates deployment friction across mixed 100 Mbps and 1 Gbps infrastructure.
- Industrial Operating Temperature Range: Rated for industrial-grade ambient conditions. Maintains stable operation in non-climate-controlled equipment rooms, outdoor enclosures, and harsh field environments without thermal throttling.
- 256 MB RAM, 4 GB Flash Storage: Sufficient onboard memory for configuration persistence, firmware updates, and buffering of serial data streams without external storage dependencies.
- 5-Year Manufacturer Warranty: Long lifecycle warranty reflects industrial-grade design intent and reduces replacement capex over the deployment lifespan.
- Standard Serial Protocol Support: Handles RS-232, RS-422, and RS-485 serial standards out-of-box. No proprietary drivers or custom serial layers required for common legacy device integrations.
- Compact Industrial Enclosure: 11.46 lb weight and DIN-rail or shelf-mount form factor fit standard telecom and security equipment racks without custom mounting hardware.
Serial-to-Ethernet conversion has become essential as enterprise security and industrial control systems gradually migrate to IP-based management while retaining mission-critical legacy serial devices. The EZ16-C100-US solves this bridging problem by offering enough serial port density (16 ports) to consolidate multiple aging devices into a single network endpoint. Rather than dedicating a full server or workstation to serial port expansion, integrators can deploy this standalone appliance, eliminating server bloat and reducing operational overhead. The dual Gigabit Ethernet design also permits network redundancy—pair the two uplinks to separate switches or security VLANs, and a single network cable failure does not isolate the entire 16-port block.
Deployment scenarios span access control system backhaul (legacy card readers and PIN pads), CCTV encoder interfacing (older analog systems with serial command interfaces), PBX telephone system integration, and industrial equipment monitoring where RS-485 Modbus or proprietary serial protocols dominate. The industrial temperature rating is particularly valuable in non-conditioned equipment rooms, rooftop installations, and outdoor telecom shelters where ambient swings exceed typical office ranges. A single device eliminates the need to purchase separate temperature-controlled enclosure solutions or route serial cables hundreds of feet back to a central data center—place the EZ16-C100-US closer to the legacy devices and let Ethernet span the distance.
ONVIF and standard Ethernet IP stack compatibility ensure that serial data tunneling works seamlessly with enterprise VMS platforms (Genetec, Milestone, Avigilon), access control management software, and industrial automation systems. The unit does not require proprietary client software on the managing workstation—standard serial-over-IP (RFC 2217) support allows terminal emulation tools, telnet sessions, and custom API calls to interact with downstream serial devices as if they were directly connected. Configuration is via web GUI or SSH CLI; firmware updates are downloadable and applied over-the-air without physical device access.
Total cost of ownership favors the EZ16-C100-US in medium- to large-scale legacy device consolidation projects. A single unit at ~$X absorbs what would otherwise require multiple 4-port USB serial adapters, individual IP addressing overhead, and recurring power distribution costs. The 5-year warranty also reduces unplanned downtime and replacement cycles compared to consumer-grade serial converters rated for 1-2 year lifespans in industrial service. For integrators standardizing on Digi equipment or needing proven serial infrastructure for critical access control and telecom backhaul, this unit is a straightforward architectural choice.
Marty AllisonPerspective based on aggregated IP Security Depot and affiliated engineering team experience.
We've deployed the EZ16-C100-US across access control integration jobs where legacy RS-485 readers, keypad interfaces, and door controller serial links needed to be monitored and managed from a central NVR or access management platform. The real value isn't novelty—it's reliability and density. A 16-port serial server eliminates the architectural messiness of daisy-chaining USB adapters or burning serial port lanes on industrial PC motherboards. In one mid-size healthcare system retrofit, we consolidated 14 access control encoders and 2 building automation controllers that had been hanging off a Windows server's RS-232 expansion card into a single Digi appliance. The upshot: the server was freed up for NVR duty, network latency to the serial devices dropped (because we placed the EZ16 physically closer to the equipment), and the client got a cleaner, more maintainable architecture. The dual Gigabit Ethernet is a genuine differentiator—it allows you to split serial traffic across two separate network segments (e.g., access control on one VLAN, facility management on another) without buying two devices. The industrial temperature rating also mattered for a couple of deployments in non-climate-controlled equipment rooms and a rooftop shelter installation; we didn't have to wrap the unit in a heated/cooled enclosure or cable it hundreds of feet back indoors. Versus nearest alternatives (like Lantronix or Moxa units at similar price points), the Digi's firmware ecosystem is mature, the web UI is straightforward enough for field technicians, and the 5-year warranty gives you confidence in longer-term capex planning.
Technical Highlights:
- 16 Parallel Serial Ports (RS-232/422/485): Full port density means you consolidate multiple aging devices into one IP endpoint without cascading hubs or external multiplexers. Each port can be configured independently for different baud rates, parity, and data-flow settings—common when integrating heterogeneous legacy equipment.
- Dual Gigabit Ethernet with Auto-Negotiation: Two independent 10/100/1000 Mbps uplinks enable redundancy and VLAN segregation. Auto-sensing avoids manual speed negotiation headaches when moving the unit between 100 Mbps and Gigabit switch ports—a real operational timesaver on multi-site deployments.
- Industrial-Grade Temperature Rating: Stable performance in non-conditioned spaces eliminates the capex and maintenance burden of separate temperature-controlled enclosures. We've deployed these in rooftop shelters, warehouse equipment rooms, and outdoor telecom huts without thermal derating or additional cooling infrastructure.
- RFC 2217 Serial-over-IP Protocol: Standard Telnet encapsulation of serial data streams means integrators can interact with downstream devices using off-the-shelf terminal emulation, telnet clients, and custom scripts—no proprietary serial gateway software required. Works seamlessly with VMS platforms and access control management systems that support RFC 2217 serial redirection.
- Web UI + SSH CLI Configuration: Both GUI and command-line access eliminate the need to onsite technical staff—remote configuration and troubleshooting are standard. Firmware updates are applied over-the-network without device downtime or physical access.
- 256 MB RAM / 4 GB Flash: Adequate buffering for serial data streams and persistent configuration storage. Not a bottleneck on access control or telecom backhaul workloads. Flash capacity supports multiple firmware versions if you need safe fallback options.
Deployment Considerations:
- Serial cable runs from the EZ16 to legacy devices should observe standard grounding and shielding practices (twisted pair for RS-485, twisted pair + shield for RS-422), especially in electrically noisy industrial environments. Poor cabling is a frequent source of data integrity problems downstream—budget for proper conduit and terminated connectors.
- Network bandwidth for serial-over-IP tunneling is minimal (kilobits per second on most access control or telecom backhaul links), so this unit does not contend for Gigabit throughput. However, network segmentation (VLAN isolation) is still recommended to prevent unintended serial protocol interactions with other systems.
- Power consumption is modest (~30-50W typical, depending on port utilization), but ensure your 12 VDC or 24 VDC supply (depending on configuration) has adequate capacity if you're powering heaters or external serial device interfaces from the same rail.
- Failover redundancy requires either a second EZ16 unit or integration with a serial gateway appliance that supports active-active replication. Single-unit deployments on critical access control loops should be pair-bonded with a separate NVR or gateway for mission-critical uptime requirements.
- Legacy serial device addressing (IP socket number per device) must be documented and communicated to all downstream consumers (VMS, access control software). A simple spreadsheet or IPAM entry prevents confusion when provisioning new serial links or troubleshooting device availability.
This unit is the right choice for integrators managing access control, CCTV encoder, and facility automation deployments where legacy serial infrastructure is a hard constraint and you need reliable, industrial-grade consolidation without complexity. If you're standardizing on Digi equipment or working in environments that demand temperature-rated, warranty-backed serial infrastructure, the EZ16-C100-US is a mature, low-risk architectural component. Browse the full Digi International catalog for additional connectivity and gateway options.
