USR-TCP232-304 Industrial RS485 To Ethernet Converter Serial Device Server

The USR-TCP232-304 is a compact, industrial-grade 1-port RS485 to Ethernet converter designed to enable reliable and transparent data transmission between RS485 serial devices and TCP/IP Ethernet networks. It is an ideal solution for integrating legacy RS485 equipment-such as PLCs, sensors, meters, and controllers-into modern networked and IoT systems.

Built around an ARM Cortex-M0 processor running at 48 MHz, the USR-TCP232-304 provides stable performance with low power consumption. It supports a wide range of baud rates and serial communication parameters, ensuring compatibility with most RS485-based industrial devices. Through transparent transmission, serial data is encapsulated into Ethernet TCP/IP packets without requiring changes to existing device protocols.

The converter supports multiple networking modes, including TCP Server, TCP Client, UDP Server, UDP Client, and HTTPD Client, giving engineers flexibility in system architecture. With built-in Modbus RTU to Modbus TCP gateway functionality, it is particularly well suited for industrial automation and SCADA systems where Modbus communication is required.

Configuration is simple and flexible, using a built-in web interface, AT commands, configuration software, or configuration protocol. Advanced features such as heartbeat packets, registration packets, user-defined webpages, and automatic restart on no-data conditions enhance communication reliability in unattended or remote installations.

Designed for industrial environments, the USR-TCP232-304 operates over a wide temperature range and complies with IEC 61000 EMC Level 3, providing protection against surge, ESD, and EFT interference. Its compact size and wall-mountable design make it easy to install in control cabinets and space-constrained applications.

Key Features

• Industrial RS485 to Ethernet serial device server
• Transparent data transmission between RS485 and TCP/IP
• ARM Cortex-M0 processor @ 48 MHz
• Supports TCP/UDP/IP/HTTP/DHCP/DNS/IPv4
• Modbus RTU to Modbus TCP gateway, multi-host polling
• Multiple working modes: TCP Server/Client, UDP Server/Client, HTTPD Client
• Up to 16 TCP client connections
• Web-based configuration, AT commands, and configuration software
• Heartbeat packet and registration packet support
• Compact, low-power, wall-mountable industrial design
• EMC Level 3 protection for harsh environments

Hardware Specifications

• Model: USR-TCP232-304
• Processor: ARM Cortex-M0, 48 MHz
• Power Input:
  DC 5.0-7.0 V
  Connector: DC 5.5 × 2.1 mm
• Power Consumption: 150 mA @ 5 V
• Ethernet Port: 1 × RJ45, 10/100 Mbps, Auto MDI/MDIX
• Serial Interface: RS485
• Baud Rate: 600 ~ 230.4 Kbps

Serial Communication Parameters

• Data Bits: 5, 6, 7, 8
• Stop Bits: 1, 2
• Parity: None, Odd, Even, Mark, Space
• Serial Packaging:
  Packaging time: Four-byte sending time
  Packaging length: 400 bytes
• Serial Packet Cache:
  Receive: 2 KB
• Reload Button: Supported

Network & Software Features

• Network Protocols: IP, TCP, UDP, DHCP, ICMP, HTTP, IPv4, DNS
• IP Modes: DHCP, Static IP
• DNS Service: Supported
• Configuration Methods:
  Built-in web page
  AT commands
  Configuration software
  Configuration protocol
• Working Modes:
  TCP Server / TCP Client
  UDP Server / UDP Client
  HTTPD Client
• TCP Server Capacity: Up to 16 clients
• Network Packet Cache:
  Send: 6 KB
  Receive: 4 KB
• Additional Functions:
  RFC2217-like function
  Heartbeat packet
  Registration packet
  Index support
  Auto restart on no-data condition

Environmental & Mechanical

• Installation: Wall mounting
• Dimensions (L × W × H): 73.2 × 70.0 × 25.0 mm
• Operating Temperature: -25 C to +75 C
• Storage Temperature: -40 C to +105 C
• Operating Humidity: 5%-95% RH (non-condensing)
• Storage Humidity: 5%-95% RH (non-condensing)
• Indicators: None

Compliance

• EMC: IEC 61000, Level 3 (Surge, ESD, EFT)
• Certification: CE

What's in the box
1 x USR-TCP232-304 Industrial RS485 to Ethernet Serial Device Server