Serial UART to Wifi, WiFi Modules with on-board antenna

USR-WIFI232-Ca can realize bidirectional transparent data transmission between serial and wifi network with simple setup.

  • SMD Type
  • 1 TTL Serial Ports Supporting Data Rates of up to 460.8Kbps
  • On‑board antenna
  • 32 simultaneous client connections to Soft AP interface
General Details
Note: Product has been discontinued, new alternatives click,

Introduction of WiFi Modules with on-board antenna

USR-WIFI232-Ca is an embedded 802.11 b/g/n wifi module with internal antenna. It can connect traditional serial device and MCU controlled device with wifi network to realize control and management. And the module can realize bidirectional transparent data transmission between serial and wifi network with simple setup.

Features of WiFi Modules with on-board antenna

  • Support 802.11b/g/n wireless standards
  • Support TCP/IP/UDP network protocols
  • Support UART/GPIO/Ethernet data interface
  • Support work as STA/AP/AP+STA mode
  • Support router/bridge mode networking
  • Support internal antenna
  • Support transparent transmission mode
  • Support AT+ instruction set for configuration
  • Support friendly web configuration page
  • Support heartbeat signal and wifi connection indication
  • Support UART auto-frame function
  • Single +3.3V power supply
  • FCC/CE/RoHS/TELEC certificated

Application field of WiFi Modules with on-board antenna

  • WiFi remote control and monitoring, TCP/IP and WiFi coprocessor
  • WiFi remote control toy such as aircraft and cars
  • WiFi Internet radio, camera, digital photo frame
  • Medical instrument, data acquisition, handheld device
  • WiFi fatness testing machine, smart card terminal, Smart Home
  • Instrument, equipment parameter monitoring, wireless POS machine
  • Modern agriculture, military field and other wireless related secondary development applications

Work mode of WiFi Modules with on-board antenna

1.AP Mode

wifi serial module ap mode

2.STA Mode

wifi serial module sta mode

3.AP+STA Mode

wifi serial module ap sta

Various parameter setting method

Software Settings
Download settings software, search WiFi Modules in the LAN through the serial port server IP, name, MAC address, or the version number. Then set the parameters you need, otherwise keep the default.
Web-page Settings

  1. Open your browser and inter the default IP address of the WiFi Modules.
  2. Open the login page of Serial Server, Enter the user name and password (default admin).
  3. After setting parameter, Click “Save“ and “Restart“, then setting will take effect.

Serial AT commands Settings
User can set parameter by module itself without going through another computer to configure. This setting method is used in the following situation: user have to configure IP address and destination IP address on site. AT command can meet the demand. After MCU connects serial server module by TTL (UART), MCU can configure setting by AT command.

More Images of  WiFi Modules with on-board antenna

WiFi Modules with on-board antenna

Wireless Parameters
Wireless Standard802.11 b/g/n
Frequency Range2.412GHz-2.484GHz
Transmit Power802.11b: +20dBm (Max.)
802.11g: +18dBm (Max.)
802.11n: +15dBm (Max.)
Receive Sensitivity802.11b: -89 dBm
802.11g: -81dBm
802.11n: -71dBm
AntennaInternal: on-board antenna
Hardware Parameters
Data InterfaceUART: 300bps~460800bps
Ethernet: 100Mpbs
Operating Voltage3.3V (+/-5%)
Operating Current170mA ~350mA
Operating Temp.-40°C ~ 85°C
Storage Temp.-40°C- 125°C
Size25mm x 40mm x3mm
Software Parameters
Wireless Network TypeStation/AP Mode
Security MechanismWEP/WPA-PSK/WPA2-PSK
Encryption TypeWEP64/WEP128/TKIP/AES
Work ModeTransparent transmission
Serial command
Setting CommandAT+ instruction set
Max. Client Number in TCP Server Mode32
User ConfigurationWeb server+AT command config.
Client Application SoftwareSupport clients to customize application software
All USR products will be tested by R&D first, then production test again.(ESD Test,Surge/EFT Test, High/Low Temperature Test, EMC and LVD environment reliability test, etc.) Click here to watch test videos.
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USR products are exported to more than 100 countries and regions, get approvals like CE, FCC, ROHS, CCC, KC, IC, SRRC, etc.
USR product certificate
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