Best Modbus to Ethernet Isolated Converter Options for Industrial Networks
Finding a reliable Modbus to Ethernet isolated converter is essential for safe, long-distance, and interference-free industrial communication. Below are five prominent options that support Modbus gateways and robust Ethernet connectivity. Each entry includes key features to help you compare quickly and choose the right model for rail-mount or DIN-rail installations.
| Product | Brand | Interface | Power | Modbus Support | Mounting |
|---|---|---|---|---|---|
| Waveshare RS232/485/422 to RJ45 Ethernet Converter | Waveshare | RS232/485/422 to Ethernet | DC 6–36V; PoE | Modbus Gateway | Rail-Mount |
| Waveshare 2-Ch RS485 to POE Ethernet Converter | Waveshare | 2x RS485 to Ethernet | DC 6–45V; PoE | Modbus Gateway, MQTT Gateway | Rail-Mount |
| Waveshare Industrial Serial Server RS485 to RJ45 Ethernet | Waveshare | RS485 to Ethernet | DC 9–24V | Modbus Gateway, MQTT Gateway | Rail-Mount |
| 2-Ch RS485 to Ethernet Converter Industrial Isolated Serial Server | Waveshare | 2x RS485 to Ethernet | DC 6–45V | Modbus Gateway, MQTT Gateway | Rail-Mount |
| PUSR RS232 RS485 Modbus RTU to Modbus TCP Gateway | PUSR | RS232/RS485 to TCP/IP | DC 5–36V | Modbus Gateway | DIN Rail |
Note: This table provides a quick guide to key features and mounting options. For detailed specifications, refer to each product section below.
Waveshare RS232/485/422 To RJ45 Ethernet Converter
Brand: Waveshare
Features: RS232/485/422 to RJ45 Ethernet Module with POE function, onboard RS232 / 485 / 422 three different interfaces, bi-directional transparent data transmission between RS232/485/422 and Ethernet, suitable for more application scenarios, Industrial isolated rail-mount RS232/485/422 serial server, support PoE Ethernet port power supply, suitable for IEEE 802.3af PoE standard, support screw terminal and DC power port for power supply, DC 6~36V wide voltage range input, Support Modbus Gateway, suitable for Modbus networking upgrade, can be used with specific configuration software
Waveshare 2-Ch RS485 To POE Ethernet Converter
Brand: Waveshare
Features: Support Ethernet Port Cascade, onboard 2-ch Ethernet Ports for communication and cascade, either one can be used for dual serial server network communication, while the other one can be used for cascading or communication with other devices, Support screw terminal and DC power port for power supply or PoE port, DC 6~45V, wide voltage range input, Modbus gateway support, suitable for Modbus networking upgrade, can be used with specific configuration software. Supports TCP server / TCP client / UDP multicast / UDP mode. MQTT/JSON to Modbus, more flexible conversion between different protocols
Waveshare Industrial Serial Server RS485 To RJ45 Ethernet
Brand: Waveshare
Features: Power supply is not included; use a 12V Industrial DIN-Rail Power Supply. This is an RS485 device data acquisitor / IoT gateway designed for industrial environment. Combines serial server, Modbus gateway, MQTT gateway, RS485 to JSON, etc. Features RS485 and Ethernet ports; screw terminals for power input; supports 9–24V wide range power supply.
2-Ch RS485 To Ethernet Converter Industrial Isolated Serial Server
Brand: Waveshare
Features: Support Ethernet Port Cascade, onboard 2-ch Ethernet Ports for communication and cascade, either one can be used for dual serial server network communication, while the other one can be used for cascading or communication with other devices, Support screw terminal and DC power port for power supply, DC 6~45V, wide voltage range input, Modbus gateway support, suitable for Modbus networking upgrade, can be used with specific configuration software. Supports TCP server / TCP client / UDP multicast / UDP mode. MQTT/JSON to Modbus, more flexible conversion between different protocols
PUSR RS232 RS485 Modbus RTU To Modbus TCP Gateway
Brand: PUSR
Features: Serial Port: RS232 and RS485, can be used simultaneously, Redundant Power supply: DC 5-36V or Terminal power supply, Modbus Gateway: Modbus RTU to Modbus TCP, Modbus Polling
PUSR TCP232-306 Modbus Gateway
Brand: PUSR
Features: ARM core, Cortex-M0 solution, optimized TCP/IP protocol stack with low latency; Supports Modbus RTU to Modbus TCP, multi-host polling; hardware and software watchdog; automatically restarts when the device goes down.
Buying Guide
When selecting a Modbus to Ethernet isolated converter, consider these factors to ensure compatibility and longevity in industrial environments:
- Communication interfaces: Ensure the device supports your serial standard (RS232, RS485, RS422) and the tool’s Modbus variant (RTU, TCP).
- Isolation and safety: Look for galvanic isolation ratings to protect PLCs and sensors from voltage spikes and ground loops.
- Power options: Check input voltage range and whether the unit supports PoE or needs a dedicated DIN rail power supply.
- Ethernet features: Verify TCP/UDP capabilities, port counts, and whether cascading or port sharing is required for network topology.
- Modbus gateway functionality: Confirm support for Modbus RTU to Modbus TCP, polling modes, and any gateway-specific software utilities.
- Mounting format: Choose rail-mount vs. DIN-rail or compact enclosures based on your panel design and space constraints.
- Protocol flexibility: Consider MQTT/JSON support if integration with IoT platforms is planned.
- Configuration and maintenance: Prefer devices with straightforward software configuration and reliable firmware update options.
The options listed here emphasize rugged industrial use with modular Modbus integration, multiple Ethernet pathways, and easy retrofitting into existing networks. In environments where power reliability and isolation are critical, terminals, PoE power, and rail-mount configurations can simplify deployment and maintenance.