Serial Ethernet Device Server

Serial Ethernet Device Server – Industrial Serial to Ethernet Converter (RS232 / RS422 / RS485)

Sollae serial ethernet device servers connect RS232, RS422, or RS485 equipment to a standard 10/100 Ethernet network, letting you monitor, control, and integrate legacy serial devices over IP — without replacing them or writing custom networking code.

What Serial to Ethernet Converters Are Used For

Teams buy a serial to ethernet converter to reduce on-site visits and bridge serial-only equipment into IP-based systems. Common applications include:

Remote monitoring and control of meters, controllers, barcode readers, weigh scales, and PLC-adjacent devices
Extending serial links over IP (serial tunneling) when distance or physical access is a constraint
SCADA and dashboard integration for continuous data access from serial instruments
Remote service access to industrial equipment that still relies on RS232/RS485 console ports
Multi-site modernization to standardize device connectivity across branches or plants

Serial to TCP and Serial to UDP: How Device Server Modes Work

A serial ethernet device server maps your serial data stream into IP packets. The operating mode determines who initiates the connection and how data flows:

Common modes: TCP Server — your application connects to the device server (most common for stable links). TCP Client — the device server initiates the connection to your host. UDP — low-overhead datagrams for telemetry and broadcast-style workflows. Serial tunneling — pair two device servers to create an extended serial link over Ethernet. Virtual COM (RFC2217) — present a remote serial port as a local COM port for legacy Windows software.

Compare Industrial Ethernet Device Server Models

Model	Ports / Interface	Key strengths	Best for
CSE-H53N	1× RS232 (DB9M), 10/100 Ethernet	IPv4/IPv6, SSL, MAC/IP filtering, Virtual COM (ezVSP), serial tunneling	Single legacy device: PLC service ports, RS232 instruments, meters
CSE-H55N2	1× RS422/RS485 (terminal block), 10/100 Ethernet	Noise-resistant industrial design, IPv4/IPv6, SSL, MAC/IP filtering, Virtual COM	RS485 field devices, noisy industrial environments, long-run serial networks
CSE-H21	2× RS232 (DB9M), 10/100 Ethernet	Electrically isolated ports, surge protection, SSL/SSH options, Virtual COM	Two serial devices per cabinet, noisy plants, sites needing extra isolation
CSC-H64	4× RS232/RS422/RS485 (DB9M), Ethernet + WLAN via USB dongle	Soft AP for Wi-Fi setup, WPA-Enterprise, IPv4/IPv6, Virtual COM	Multi-device serial aggregation, mixed interface environments, Wi-Fi-optional sites

Industrial Reliability and Security: What Buyers Compare

Pages that rank well for industrial ethernet device server searches emphasize three things: durability, flexible TCP/UDP modes, and secure access. Sollae covers all three with practical features that reduce operational risk:

Industrial temperature ranges (up to −40 °C to +85 °C on key models) for cabinets and field environments
Protection circuits for over-voltage, reverse-voltage, and over-current on select models
Isolation and surge protection options where noise immunity is critical
SSL/TLS and MAC/IP filtering on supported units for controlled remote access
IPv4/IPv6 dual stack for modern network compatibility

Serial to Ethernet Converter Buyer Checklist

Interface: RS232 (CSE-H53N / CSE-H21) vs RS485/RS422 (CSE-H55N2) vs mixed ports (CSC-H64).
Mode required: TCP Server/Client, UDP, or serial tunneling (device pairs).
Legacy software: need a COM port in Windows? Confirm RFC2217 and Virtual COM driver support.
Environment: noisy plant or harsh temperature? Choose isolation, surge protection, and industrial operating ranges.
Security: if the device is reachable beyond a protected LAN, prioritize SSL/TLS and access filtering.

Fastest start: For a single RS232 device, begin with the CSE-H53N. For RS485/RS422 field devices, choose the CSE-H55N2. For four devices in one cabinet, the CSC-H64 covers both Ethernet and optional Wi-Fi.

Serial Ethernet Device Server