SKU: IOWC-1808
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USR-WIFI232-B2 Industrial UART to Wi-Fi Module

₹1,509.00 (Inclusive of all taxes)
Out of Stock

The USR-WIFI232-B2 is an industrial-grade serial-to-Wi-Fi module that provides seamless TTL UART to 802.11b/g/n wireless conversion, supporting transparent transmission, Modbus TCP, and MQTT gateway functions for robust IoT data acquisition and remote monitoring systems.

Features

  • Industrial-grade UART to Wi-Fi bridge with transparent serial transmission and Ethernet support via pin header.
  • Supports multiple IoT protocols including Modbus TCP to RTU gateway, MQTT client, and HTTPD Client modes.
  • High-power RF performance with up to +19dBm transmit power for extended range in industrial environments.
  • Configurable via serial AT commands, web browser, or host software for flexible integration.
  • Wide operating temperature range from -40°C to 85°C for reliable deployment in harsh conditions.

Out of stock

Description

The USR-WIFI232-B2 is a compact, industrial-grade wireless module engineered to bridge legacy serial devices to modern IP networks. It converts TTL UART signals to 802.11b/g/n Wi-Fi, enabling seamless integration of sensors, controllers, and instruments into IoT ecosystems. The module operates on a 3.3V DC supply and features robust RF performance with high transmit power for reliable connectivity in challenging RF environments.

Its architecture supports multiple operational modes including transparent transmission, serial command, and protocol-specific gateways like Modbus TCP to RTU. This flexibility allows developers to implement it as a serial server, an MQTT gateway for cloud connectivity, or an HTTP client for web services. The module’s industrial design ensures stable operation across a wide temperature range, making it suitable for telemetry, remote monitoring, and industrial automation applications where wired serial connections are impractical.

Key Features

  • Bi-directional transparent transmission between TTL serial port, Wi-Fi, and Ethernet interfaces.
  • Multi-protocol gateway functionality for Modbus TCP/RTU conversion and MQTT client operations.
  • High RF output power (+19dBm max) and excellent receiver sensitivity for robust wireless links.
  • Configurable via AT commands, embedded web server, or host software for easy setup and management.
  • Industrial temperature rating (-40°C to 85°C) and 5-95% humidity tolerance for harsh environments.
  • Supports Station, AP, and AP+Station Wi-Fi modes for flexible network topologies.
  • Integrated security with WPA-PSK/WPA2-PSK encryption for secure data transmission.

Applications

  • Industrial IoT gateways for sensor data acquisition and remote monitoring.
  • Legacy serial device modernization (PLC, meters, instruments) via Wi-Fi connectivity.
  • Modbus TCP/RTU protocol conversion in building automation and SCADA systems.
  • MQTT-based telemetry and cloud data logging for environmental sensing.
  • Wireless security and access control systems requiring robust, long-range links.

Technical Specifications

Wireless ProtocolIEEE 802.11b/g/n
Frequency Band2.412 - 2.484 GHz
RF Transmit Power802.11b: +19dBm (Max), 802.11g: +18dBm (Max), 802.11n: +17dBm (Max)
RF Sensitivity802.11b: -89dBm, 802.11g: -81dBm, 802.11n: -73dBm (HT20)
Supply VoltageDC 3.3V (±5%)
Serial InterfaceTTL UART (5-9 data bits)
Ethernet Interface10/100M auto-negotiation (via pin header)
Operating ModesTransparent Transmission, Serial Command, HTTPD Client, Modbus Gateway
SecurityWPA-PSK / WPA2-PSK
Operating Temperature-40°C to 85°C
Dimensions (Shipping)8 x 7 x 3 cm

Frequently Asked Questions

How do I configure the USR-WIFI232-B2 module for transparent serial transmission?

Configure the module via its serial AT commands or built-in web server. Set the operating mode to transparent transmission, specify the target Wi-Fi SSID and password, and define the local UART baud rate and parameters. The module will then automatically forward all serial data bidirectionally between the UART port and the configured Wi-Fi network TCP/IP socket, requiring no protocol parsing on the host microcontroller.

What is the procedure to set up the module as a Modbus TCP to RTU gateway?

First, connect to the module's configuration interface via serial AT commands or web UI. Select the 'Modbus Gateway' operating mode. Configure the serial side with the correct Modbus RTU settings (baud rate, parity, stop bits) matching your slave devices. On the network side, set the module's IP address and the TCP port for Modbus TCP masters to connect. The module will handle protocol conversion, allowing standard Modbus TCP clients to communicate with RTU serial devices seamlessly.

What power supply requirements and current consumption should I consider for this module?

The module requires a stable 3.3V DC power supply with ±5% tolerance. You must provide a power source capable of supplying sufficient current, especially during high-power RF transmission peaks. Ensure your power regulator has low noise and adequate decoupling capacitors near the module's power pins to maintain stability and prevent voltage drops that could cause resets or unreliable wireless performance.

Package Includes

  • 1 x USR-WIFI232-B2 UART to Wi-Fi Module

Additional Information

Weight 0.006 kg
Dimensions 7 × 8 × 3 cm