Wireless Serial Modules with On-board Antenna

USR-WIFI232-Sa is a UART to wifi module with internal antenna,used for data transparent transmission.

  • 1 TTL Serial Ports Supporting Data Rates of up to 230.4Kbps
  • SMD Type
  • Onboard antenna
  • 2 simultaneous client connections to Soft AP interface
General Details
Note: Product has been discontinued, new alternatives click, http://www.usriot.com/p/iot-wifi-modules/

Introduction of Wireless Serial Modules

The Wireless Serial Modules with internal antenna, used for data transparent transmission. The hardware of USR-WIFI232-Sa wifi module integrates MAC,baseband chip and RF transceiver unit. USR-WIFI232-Sa supports WiFi protocol and TCP/IP protocol.Users can realize uart device networking via simple configuration.

Features of Wireless Serial Modules

  • WIFI@2.4 GHz, support WEP, WPA/WPA2 security mode.
  • Self-developed MCU platform
  • The fully integrated serial to wifi function
  • Support multiple network protocols and WiFi connection configuration
  • Support work as STA/AP mode
  • Support SmartLink intelligent networking function (APP provided)
  • Support UsrLink function (fast set SSID)
  • Upgrade firmware via wifi network
  • Support internal PCB antenna
  • Support multiple PWM signal output channel
  • Support AT+ command set configuration
  • Tiny Size: 22mm x 13.5mm x 2.3mm
  • Single +3.3V power supply
  • Support low power real-time operating system and driver
  • CE/FCC/RoHS certificated

Application field of Wireless Serial Modules

  • 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

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.
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.

Optimized low power wifi modules

Low power wifi modules are integrated 802.11b / g / n low-power embedded wifi modules.
It provides a solution to connect the physical device to wifi wireless network and transfer data by UART interface. It is widely used in those fields which need to transfer data with low flow and low frequency. e.g: smart home, smart electricity, medical monitoring, industrial control.

Work mode of Wireless Serial Modules

1. AP Mode


2.STA Mode


Images of Wireless Serial Modules

wireless serial modules

Wireless Parameters
Wireless Standard802.11 b/g/n
Frequency Range2.412GHz-2.484GHz
Transmit Power802.11b: +16 +/-2dBm (@11Mbps)
802.11g: +14 +/-2dBm (@54Mbps)
802.11n: +13 +/-2dBm (@HT20, MCS7)
Receive Sensitivity802.11b: -93 dBm (@11Mbps, CCK)
802.11g: -85dBm (@54Mbps, OFDM)
802.11n: -82dBm (@HT20, MCS7)
AntennaInternal: On-board PCB antenna
Hardware Parameters
Data InterfaceUART, PWM, GPIO
Operating Voltage3.0~3.6V
Operating CurrentContinuous TX: ~200mA
Normal Mode Average: ~12mA, Peak: 200mA
Operating Temp.-40°C ~ 85°C
Storage Temp.-45°C- 125°C
Size22mm x 13.5mm x 2.3mm
External InterfaceSMT
Software Parameters
Wireless Network TypeSTA/AP
Security MechanismWEP/WPA-PSK/WPA2-PSK
Encryption TypeWEP64/WEP128/TKIP/AES
Update FirmwareLocal WiFi
Network ProtocolIPv4, TCP/UDP/FTP/HTTP
User ConfigurationAT+ command
Android/IOS APP
Smart Link APP
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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