Discover reliable serial to Ethernet solutions that enable seamless device networking, remote monitoring, and data logging. The following picks cover RS232, RS485, and RS422 interfaces with various deployment options—from wall- or rail-mountable units to compact, low-latency gateways. Each option supports TCP/IP, and many offer DHCP/DNS, Modbus integration, and web-based configuration for straightforward deployment.
| Product | Brand | Interface | Key Features |
|---|---|---|---|
| USR-TCP232-302 Tiny Size RS232 to TCP IP Converter | PUSR | RS232 to Ethernet | DHCP/DNS, web config, auto-MDI/MDI-X, 10/100 Mbps, transparent transmission |
| Waveshare Ethernet Industrial Serial Server RS485 | waveshare | RS485 to Ethernet | Modbus gateway, multiple modes, rail-mount, DHCP/DNS, MQTT/JSON |
| Waveshare RS232/485/422 to RJ45 Ethernet Module | waveshare | RS232/RS485/RS422 to Ethernet | PoE, rail-mount, wide power input, RPC/Modbus support, wall/rail mounting |
| PUSR TCP232-306 RS232/RS485/RS422 to Ethernet | PUSR | RS232/RS485/RS422 to Ethernet | Modbus gateway, low latency, hardware/software watchdog |
| Lantronix UD1100001-01 UDS1100 | Lantronix | RS232/RS485/RS422 to Ethernet | One port, UL864, easy remote access, durable for US installation |
USR-TCP232-302 Tiny Size RS232 To TCP IP Converter
The USR-TCP232-302 is a compact serial device server designed for bidirectional, transparent data transmission between RS232 devices and Ethernet networks. It integrates a TCP/IP stack and offers straightforward networked operation suitable for device networking. Typical use cases include remote sensors, POS peripherals, and legacy equipment that need Ethernet reach without rewriting firmware. It supports DHCP for automatic IP assignment and DNS for domain resolution, simplifying deployment in diverse networks. The device provides a web-based interface for parameter configuration, and firmware upgrades can be performed over the network. It features Auto-MDI/MDIX and a 10/100 Mbps Ethernet interface, with a wide UART baud rate range up to 230.4 Kbps. Parity options include None, Odd, Even, Mark, and Space, enabling compatibility with a broad set of serial devices. The module is well-suited for embedded projects requiring a small, cost-effective gateway.
Key considerations:
– Pros: Small footprint, easy web configuration, DHCP/DNS support, transparent RS232-to-Ethernet bridging.
– Cons: Limited to RS232; higher channel counts may require more capable gateways for complex deployments.
– Best for: Quick add-ons to legacy RS232 devices that need Ethernet access in small racks or on a bench.
Waveshare Ethernet Industrial Serial Server RS485
This industrial gateway focuses on RS485 connectivity with Ethernet transport, making it ideal for factory floor data acquisition and Modbus-based architectures. It functions as a serial server and gateway, providing bi-directional transparency between RS485 devices and Ethernet networks. The rail-mount capability allows easy integration into control cabinets with multiple modules. The gateway supports Web-based configuration and DHCP/DNS for network setup, and it can interface with Modbus gateways and MQTT/JSON pipelines, enabling flexible data flow to cloud or local servers. The product emphasizes reliability in industrial environments with robust network compatibility and multi-mode operation.
Key considerations:
– Pros: Robust industrial design, rail-mount compatibility, Modbus/ MQTT support, flexible network modes.
– Cons: Primarily RS485-focused; may require additional adapters for other serial standards.
– Best for: Industrial automation setups needing Modbus integration and scalable multi-device networking.
Waveshare RS232/485/422 To RJ45 Ethernet Module
This Waveshare module offers multi-standards serial support (RS232, RS485, and RS422) with an Ethernet RJ45 interface and Power over Ethernet (PoE) capability. It’s designed for data acquisition and monitoring in industrial settings, featuring a compact form factor and screw-terminal power inputs for flexible installation. The PoE functionality simplifies deployment by powering the device directly from an Ethernet switch that supports IEEE 802.3af. The rail-mount option and wide input voltage range enhance field usability. It’s well-suited for Modbus networks and other industrial protocols requiring reliable serial-to-Ethernet bridging with simplified cabling.
Key considerations:
– Pros: Multi-serial support, PoE, rail-mount friendly, versatile power options.
– Cons: PoE adds network dependency; proper PoE infrastructure is needed.
– Best for: Mixed-legacy environments that require a single gateway for multiple serial standards.
PUSR TCP232-306 RS232 RS485 RS422 To Ethernet TCP IP Modbus Gateway
The PUSR TCP232-306 combines RS232, RS485, and RS422 interfaces with Ethernet in a single device, designed for remote monitoring and Modbus-friendly networks. It features an ARM Cortex-M0 core and an optimized TCP/IP stack to deliver low-latency data transmission and scalable performance across multiple hosts. The gateway supports Modbus RTU to Modbus TCP conversion and multi-host polling, enabling seamless data collection from various devices. It also includes watchdog features for reliability, automatically restarting if the gateway detects a fault. This makes it suitable for industrial automation, energy, and building management systems where multiple serial devices must be integrated over Ethernet.
Key considerations:
– Pros: Multi-interface support, Modbus gateway, low latency, watchdog for reliability.
– Cons: Higher feature density may require a bit more initial setup.
– Best for: Complex deployments needing Modbus bridging and robust monitoring across several serial networks.
Lantronix UD1100001-01 UDS1100
The Lantronix UD1100001-01 UDS1100 provides a straightforward one-port serial-to-Ethernet solution designed for quick deployment and easy remote management. This device server enables RS232/RS422/RS485 connections to be accessed over IP networks, making it an attractive option for older equipment that needs network visibility without extensive reconfiguration. It’s UL864 compliant and supports wall or rail mounting, which helps it fit into various installations—from server rooms to industrial enclosures. The single-port design keeps configurations simple while offering reliable performance and broad OS compatibility through standard management software.
Key considerations:
– Pros: Simple single-port solution, easy setup, versatile mounting options, UL864 compliance.
– Cons: Limited to one serial channel; may not meet needs of multi-device installations without additional gateways.
– Best for: Quick network-enabled upgrade of a single RS-232/RS-485 device in small deployments.
Buying Guide: Choosing The Right Serial To Ethernet Server
When selecting a serial to Ethernet server, consider the following factors to match your project requirements:
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<liInterface compatibility: Determine whether you need RS232, RS485, or RS422, or a combination. Some gateways offer multi-interface support, while others are single-channel.
<liNetwork integration: Assess DHCP/DNS support, static IP options, and whether you require Modbus gateway functionality or MQTT/JSON translation for integration with SCADA or IoT platforms.
<liPerformance and latency: For time-sensitive processes, prioritize devices with optimized TCP/IP stacks and low-latency operation. Check baud rate support and polling capabilities for multi-host configurations.
<liPower and mounting: Decide between PoE, external power, wall-mount, or rail-mount options. Industrial environments may benefit from rugged enclosures and rail mounting for cabinet installations.
<liManagement and updates: Look for web-based configuration, firmware upgradeability over the network, and a consistent management UI across devices to simplify administration.
<liReliability and watchdogs: In critical applications, devices with hardware/software watchdogs and restart behavior help maintain uptime.
<liSecurity: Ensure secure firmware updates, access controls, and network segmentation to protect connected devices and data flows.
Use-case orientation:
– Industrial automation: Prioritize Modbus gateway features, multi-mode operation (TCP server/client, UDP), and robust mounting options.
– Legacy equipment: Favor simple, single-port devices with easy web configuration and reliable serial-to-Ethernet bridging.
– Small-scale deployments: A compact gateway with straightforward management and low power needs can be both cost-effective and easy to maintain.
In summary, the best serial to Ethernet server for your environment balances interface support, network capabilities, and deployment practicality. The selected products above collectively offer a spectrum—from compact RS232 bridges to multi-interface gateways suitable for industrial settings—enabling efficient integration of legacy hardware into modern networks.