Ethernet to RS485 Converter UC-ETH-RS485
Ethernet to RS485 Converter UC-ETH-RS485
The UC-ETH-RS485 is a compact industrial Ethernet to RS485 device server and Modbus gateway. It provides seamless network connectivity for serial field devices across local area networks (LAN) or the internet. Supporting transparent data pass-through and Modbus TCP to Modbus RTU protocol conversion, it enables SCADA systems and remote PCs to communicate with serial PLCs, energy meters, and industrial instruments.
Key Features
- 1 RS-485 serial port with automatic direction control
- 10/100M auto-sensing Ethernet RJ45 port with 2 kV magnetic isolation
- Bi-directional Modbus TCP to Modbus RTU protocol gateway
- TCP Server, TCP Client, UDP, and Httpd Client socket modes
- Transparent serial data pass-through for ASCII and proprietary protocols
- Built-in web server for browser-based configuration and diagnostics
- Configurable baud rates from 300 bps to 250 kbps
- Up to 256 transceiver nodes on the RS-485 bus
- ±15 kV ESD and TVS surge protection on Ethernet, serial, and power lines
- 12V to 24V DC wide power supply input
- 35 mm DIN rail and wall mountable housing
- Dimensions: 110 mm × 70 mm × 50 mm
Ordering Information
| Product Code | Description |
|---|---|
| UC-ETH-RS485 | Ethernet to RS485 Converter (Modbus TCP/RTU Gateway, 12~24V DC) |
| SPD-ETH-RJ45 | Ethernet Surge Protection Device |
| SPD-RS485 | Surge Protection Device RS485 |
| UC-ETH-RS485-D | Ethernet to Dual RS485 Converter |
| UC-RS485 | USB to RS485 Converter |
Applications
- SCADA to Modbus RTU Interfacing: Integrating distributed power meters, flow meters, and VFDs into Ethernet SCADA networks.
- Remote Machine Telemetry: Connecting standalone PLC controllers to plant Ethernet for remote monitoring and diagnostics.
- Virtual COM Port Extension: Tunneling serial data over IP to legacy PC software via virtual serial ports.
- Control Panel Integration: Compact DIN rail server bridging field devices to in-panel managed Ethernet switches.
Specifications
| Parameter | Value |
|---|---|
| Mounting Type | 35 mm DIN Rail & Wall Mounting |
| Dimensions | 110 mm x 74 mm x 35 mm (L x W x H) |
| Enclosure Material | Industrial ABS Plastic |
| Operating Temperature | -40 °C to +85 °C |
| Storage Temperature | -40 °C to +85 °C |
| Relative Humidity | 5% to 95% RH (non-condensing) |
Electrical Specifications
| Parameter | Specification |
|---|---|
| Power Supply | 12V ~ 24V DC (30V DC maximum limit) |
| Working Current | 200 mA Max |
| Reverse Polarity Protection | Integrated series diode on DC power input |
| Ethernet Port | 1x RJ45 10/100 Mbps auto-negotiation, auto MDI/MDIX |
| Ethernet Isolation | 2,000 V RMS built-in transformer magnetic isolation |
| Serial Port | 1x RS485 Channel (Screw Terminal Block) |
| Baud Rate Range | 300 bps to 250 kbps |
| Data Format | 7/8 Data bits, 1/2 Stop bits, None/Even/Odd Parity |
| RS485 Receive Input | \(\pm 12\text{V}\) between A and B max |
| RS485 Transmit Output | A pulled up to +5V, B pulled down to 0V |
| RS485 Termination | 120 \(\Omega\) termination built-in across A and B |
| Max Receivers | Up to 256 transceiver nodes on the bus |
Isolation & Protection Specifications
| Parameter | Value | Standard / Notes |
|---|---|---|
| Ethernet Isolation | 2,000 V RMS | Galvanic magnetic barrier across RJ45 |
| RS485 ESD Immunity | \(\pm 15\text{kV}\) Air / HBM, \(\pm 8\text{kV}\) Contact | IEC 61000-4-2 ESD protection across all RS485 lines |
| Surge Protection | Fast Transient Clamping | TVS protection across Ethernet, RS485, and power lines |
LED Indications and Diagnostics
| LED | Color | Status | Description |
|---|---|---|---|
| PWR | Red | ON | Operating power connected and regulated |
| LINK | Green | ON / Blinking | Ethernet physical link established / network activity |
| RX | Yellow | Blinking | Data receiving from RS485 field bus |
| TX | Green | Blinking | Data transmitting onto RS485 field bus |
| F-RESET | – | Push Button | Restores factory default network & serial settings |
Network & Gateway Configuration
Default Factory Settings
| Parameter | Default Value | Notes |
|---|---|---|
| IP Address | 192.168.0.7 |
Static IP (DHCP selectable in web interface) |
| Subnet Mask | 255.255.255.0 |
Class C Subnet |
| Default Gateway | 192.168.0.1 |
Default router IP |
| Web UI Port | 80 |
HTTP browser access (http://192.168.0.7) |
| Web Username / Password | admin / admin |
Default credentials |
| RS485 TCP Port | 23 |
Default socket port for serial communication |
| Default Serial Settings | 115200 bps, 8, N, 1 |
Configurable 300 bps to 250 kbps |
Operating Modes & Features
- Modbus TCP to Modbus RTU Mode: Under RS485 Settings, select the operation mode to Modbus TCP to Modbus RTU. The converter transparently handles Modbus frame wrapping, checksum calculation, and transaction identification between TCP clients and RTU slaves.
- Transparent Serial Connection: Set Work Mode to
Nonefor raw serial data pass-through over TCP/UDP. Suitable for custom protocols, ASCII terminals, Virtual COM ports, and Telnet server connections. - Packet Transmission Mechanisms:
- Auto Mode (
0/0): Automatically transmits packet after 4 byte-times of silence (~350 \(\mu\)s @ 115200 Baud) or when buffer reaches 1,460 bytes. Recommended for Modbus RTU and most protocols. - Fixed Packet Mode: User-defined packet timeout (in milliseconds) and packet length (in bytes).
- Web to Serial Testing: Built-in browser tool allowing technicians to send and receive test ASCII or Hex data directly over the web UI.
Mechanical Dimensions
Terminal Details & Port Pinouts
RS485 & Power Screw Terminal Block
| Terminal Block | Pin | Label | Description |
|---|---|---|---|
| RS485 | 1 | A | RS485 Non-inverting data signal (+) |
| (Bottom Right) | 2 | B | RS485 Inverting data signal (-) |
| 3 | SLD | RS485 Cable Shield / Signal Ground | |
| DC Power | 1 | V+ | Power Supply Positive (+12V to +24V DC) |
| (Bottom Left) | 2 | V- | Power Supply Negative (Ground return) |
| Ethernet | – | RJ45 | 10/100M auto-sensing Ethernet jack (2 kV magnetic isolation) |
[!WARNING] Connecting external power supply terminals to RS485 signal terminals will damage the device permanently. Always verify wiring before applying power.
Typical Connection Diagram
Revision History
| Revision | Date | Description of Change |
|---|---|---|
| Rev 1.0 | 2026-09-09 | Initial datasheet release |
Get the latest version of this datasheet : click here..
Support
Website: www.veawe.io
Email: info@veawe.io