USR-TCP232-306 Industrial Serial To Ethernet Converter RS232 RS485 RS422

The USR-TCP232-306 is an industrial-grade 1-port serial to Ethernet converter designed to provide reliable and transparent data transmission between RS232, RS485, or RS422 serial devices and Ethernet networks. Engineered for industrial automation and control systems, this compact converter enables legacy serial equipment to be seamlessly integrated into modern IP-based networks.

Powered by an ARM Cortex-M0 processor running at 48 MHz, the USR-TCP232-306 delivers stable performance with low power consumption. It supports RS232, RS485, and RS422 interfaces, allowing flexible deployment across a wide range of serial communication standards. To ensure signal integrity and avoid conflicts, only one serial interface can be used at a time, making configuration straightforward and reliable.

The device supports multiple working modes, including TCP Server, TCP Client, UDP Server, UDP Client, and HTTPD Client, and offers full compatibility with common industrial networking protocols. With built-in support for Modbus RTU to Modbus TCP gateway functionality, it is well suited for PLCs, meters, sensors, and other Modbus-based equipment.

Designed for harsh environments, the USR-TCP232-306 operates across a wide temperature range and features EMC Level 3 protection against surge, ESD, and EFT interference. Flexible configuration options-such as AT commands, web-based configuration, and dedicated configuration software-make setup and maintenance quick and convenient.

With support for up to 16 TCP client connections, advanced features like heartbeat and registration packets, and a rugged industrial design, the USR-TCP232-306 is an ideal solution for industrial automation, building management systems, energy monitoring, and remote device networking.

Key Features

• Industrial RS232 / RS485 / RS422 to Ethernet converter
• One serial interface active at a time for stable operation
• ARM Cortex-M0 processor @ 48 MHz
• Wide power input range: DC 5-36 V
• Supports TCP/UDP/IP/HTTP/DHCP/DNS/IPv4
• Modbus RTU to Modbus TCP gateway, multi-host polling
• Up to 16 TCP client connections in TCP Server mode
• Built-in web configuration and AT command support
• Heartbeat packet, registration packet, auto restart on no data
• EMC Level 3 protection (Surge, ESD, EFT)
• Compact wall-mountable industrial enclosure

Hardware Specifications

• Model: USR-TCP232-306
• Processor: ARM Cortex-M0, 48 MHz
• Power Input:
  DC 5.0-36.0 V
  Connector: 5.5 × 2.1 mm jack & 2-pin terminal block
• Power Consumption:
  116 mA @ 5 V
  53 mA @ 12 V
• Ethernet Port: 1 × RJ45, 10/100 Mbps, Auto MDI/MDIX
• Serial Port: RS232 / RS485 / RS422 (not simultaneous)
• 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 Packet Cache:
  Receive: 2 KB
• Serial Packaging:
  Packaging time: Four-byte sending time
  Packaging length: 400 bytes

Network & Software Features

• Network Protocols: IP, TCP, UDP, DHCP, ICMP, HTTP, IPv4, DNS
• IP Modes: DHCP, Static IP
• DNS Service: Supported
• Configuration Methods:
  AT Commands
  Built-in Web Page
  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): 98.0 × 86.0 × 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: PWR, WORK, LINK, TX, RX

Compliance

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

What's in the box
1 x USR-TCP232-306 Industrial RS232/RS485/RS422 to Ethernet Converter