Description
Overview
The USR-TCP232-410S is a serial-to-Ethernet converter from USR IOT (Jinan USR IOT Technology Limited) that connects RS232 and RS485 serial devices to a TCP/IP network. It supports bi-directional communication, edge computing, Modbus gateway functionality, and MQTT gateway connectivity, making it suitable for integrating legacy serial equipment into modern automation and IoT systems.
Key Features
| Feature | Description |
|---|---|
| Edge Computing | On-device data acquisition, computing, and automatic reporting — up to 128 points |
| Data Security | SSL/TLS encryption on HTTP, MQTT, and TCP client connections |
| Dual Serial Port | 1× RS232 and 1× RS485, able to operate simultaneously |
| Modbus Gateway | Modbus RTU/TCP protocol conversion, multi-host polling up to 16 hosts |
| MQTT Gateway | Standard MQTT protocol support |
| WebSocket Support | Yes |
| Heartbeat & Registration Packets | Yes, for connection monitoring and device identification |
Specifications
| Model | USR-TCP232-410s |
| Processor | ST Solution, Cortex-M7 |
| Frequency | 400MHz |
| Power Supply | DC 5.0–36.0V, 67mA @ 12V |
| Ethernet Port | 1× RJ45, 10/100 Mbps, auto MDI/MDX, 1.5KV electromagnetic isolation |
| Serial Ports | 1× RS232 (DB9-male), 1× RS485 (3-pin terminal block) — can work simultaneously |
| Baud Rate | 600 bps – 230.4 Kbps |
| Data Bits | 7, 8 |
| Stop Bit(s) | 1, 2 |
| Parity Bit | None, Even, Odd, Mark, Space |
| Flow Control | Hardware: RTS/CTS (RS232 only); Software: XON/XOFF |
| Dimensions | 82.5 × 86 × 25 mm (L×W×H) |
| Operating Temperature | -40°C to +85°C |
| Storage Temperature | -40°C to +105°C |
| Operating Humidity | 5%–95% (non-condensing) |
| Storage Humidity | 5%–95% (non-condensing) |
| Network Protocol | IP, TCP, UDP, HTTP, MQTT, SSL/TLS, ARP, ICMP, DHCP, DNS |
| IP Assignment | Static / DHCP |
| DNS Service | Yes |
| Built-in Webpage | Yes |
| Config Method | Built-in webpage, config software, or AT command |
| Work Mode | TCP Server / TCP Client / UDP Server / UDP Client / HTTPD Client |
| Edge Computing | Yes, up to 128 points |
| MQTT Gateway | Standard MQTT protocol |
| Encryption | MQTT+SSL, TCPC+SSL |
| Modbus Gateway | Modbus RTU/TCP protocol conversion, multi-host polling up to 16 hosts |
| Serial Packet Cache | Dynamic — e.g., 371 packets (3.71 KB) at 10 bytes/packet, or 10 packets (14.6 KB) at 1460 bytes/packet |
| Ethernet Packet Cache | 48 KB |
How It Works
The USR-TCP232-410S functions as a serial device server, enabling bi-directional transparent data transfer between serial equipment and an Ethernet network. This allows Modbus RTU-based and other serial devices to communicate over a LAN or WAN, supporting remote monitoring and control without protocol mismatches between legacy serial equipment and modern network-based systems.
Typical Applications
- Remote data acquisition and control for PLC and SCADA systems
- Modbus RTU-to-TCP conversion for centralized monitoring platforms
- MQTT-based IoT data reporting to cloud platforms
- Connecting legacy serial equipment to a modern Ethernet or IoT network
- General industrial automation and equipment networking
