USR-TCP232-304 RS-485 to Ethernet Converters

Specifications

The USR-TCP232-304 is a compact industrial communication converter that enables transparent connection between RS-485 serial devices and an Ethernet network (TCP/IP). It functions as a serial-to-Ethernet gateway, ideal for automation systems, remote device monitoring, and integration of legacy serial equipment into modern networks.

Electrical & Communication

• Model: USR-TCP232-304

• Type: RS-485 to Ethernet Serial Converter

• Processor: 32-bit embedded microcontroller

• Power Input: DC 5.0 – 7.0 V via DC barrel jack

• Power Consumption: ~150 mA @ 5 V

Ethernet (Network) Specifications

• Interface: 1 × RJ45 Ethernet Port

• Speed: 10/100 Mbps (Auto negotiation)

• Auto MDI/MDIX: Supported

• IP Configuration: Static IP or DHCP

• Network Protocols: IP, TCP, UDP, DHCP, DNS, HTTP, ARP, ICMP, IPv4

• Concurrent TCP Clients (Server Mode): Up to 16 clients

Serial (RS-485) Specifications

• Interface: 1 × RS-485 (2-wire)

• Connector: Screw-terminal or captive terminal block

• Baud Rate Range: 600 bps to 230,400 bps

• Data Bits: 5, 6, 7, 8

• Parity: None, Odd, Even, Mark, Space

• Stop Bits: 1 or 2

• Buffer: Internal receive and transmit buffers for serial/Ethernet bridging

Network Modes Supported

• TCP Server

• TCP Client

• UDP Server

• UDP Client

• Virtual COM / RFC2217-style mode

• Modbus RTU to Modbus TCP gateway

• Multi-host polling mode

Configuration Options

• Web-based configuration interface

• AT command control

• Dedicated configuration software

• Virtual COM port redirector software for PC applications

• Configurable communication parameters (baud rate, parity, stop bits, TCP mode, etc.)

Physical & Environmental

• Dimensions: Compact enclosure (approx. ~73 × 70 × 25 mm)

• Mounting: Wall or panel mount compatible

• Operating Temperature: -25 °C to +75 °C

• Storage Temperature: -40 °C to +105 °C

• Operating Humidity: 5% – 95% RH (non-condensing)

• Indicators: LEDs for status (power, network, serial activity)

• EMC Protection: Meets industrial surge, ESD, and noise immunity standards

Protocol & Performance Features

• Converts Modbus RTU (over RS-485) to Modbus TCP (over Ethernet)

• Supports stable connection mechanisms (auto-reconnect, heartbeat packets)

• Reliable data forwarding between serial and Ethernet networks

• Multi-client support for parallel host connections

Typical Applications

• Industrial device networking

• PLC and sensor integration over Ethernet

• SCADA and remote monitoring systems

• IoT and M2M communication

• Legacy serial device modernisation

• Building automation systems

• Distributed control systems