serial to wifi moduleLow Cost Module
USR-WIFI232-B2/$9.80 In stock

IOT Low Cost Serial UART to WIFI Module with I-PEX External Antenna


Power: DC 3.0 ~ 3.6V.  AP: 169mA (average)@3.3V.  STA: 164mA (average)@3.3V
Interface: UART/Ethernet/GPIO
Size: 40mm x 25mm x 8mm

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Introduction  ( Low Cost Serial to WIFI Module )
USR-WIFI232-B2 is an embedded low cost serial to wifi module with I-PEX external antenna for transparent data transmission between MCU controlled device and wireless network. The Max transmission distance is 280m with 3dbi antenna under open horizon

Function  ( Low Cost Serial to WIFI Module )

  • UART/GPIO/Ethernet data interface.
  • Built in Web Server/Webpage for configuration.
  • Webpage socket to Serial.
  • HTTP Client: send data as HTTP format automatically. Serial data submitted to server by HTTP (GET/POST).
  • DHCP: automatically obtain an IP address and query IP address.
  • DNS address and MAC address can be modified.
  • Synchronous and adaptive serial port baud rate.
  • Support router/bridge mode networking.
  • Registration packet: identified header can be added to packets to check connection status.
  • Heartbeat packet: can be sent to serial or network periodic. To ensure connection is reliable, put an end to dead link.
  • Support UDP, TCP, HTTP protocol and Transparent transmission, AT Command Mode, HTTP Client Mode.
  • The Max TCP Client connection is 32 in TCP Mode. The Max STA connection is 32 in AP Mode

1) Virtual serial port software(VCOM), Windows 2000 or higher (32 bit/64 bit)
Parameter Configuration:
1)Web Server configuration. (User Manual)

2)Serial and Network AT Command.
Factory Setting:
1) Hardware reset: Pull down nReload Pin (Pin 10) for 3 seconds or more
2) Software reset: Enter AT command mode, use AT command AT+RELD.
3) Webpage setting: “Device management page”
Firmware upgrade by webpage. “Device management page” (User Manual)

WIFI Networking Mode  ( Low Cost Serial to WIFI Module )
1) AP: the wireless access point and the founder of wireless network. all devices can connect AP. E.g.: A router also work as AP.
In AP Mode, the Max STA connection is 32.

serial wifi module
2) STA: terminal of the wireless network. All communication between STAs is through AP. e.g.: PC can work as STA.

uart to wifi
3) AP+STA: supports one device as AT and one device as STA.

uart wifi module

Application  ( Low Cost Serial to WIFI Module )

  • Industrial automation system.
  • Electronic scale, vending machine and POS machine.
  • Energy consumption monitoring: intelligent ammeter and intelligent water meter.
  • Smart parking system and Intelligent traffic system.
  • Cold storage logistic system.
  • Environmental monitoring and humiture data acquisition.
Basic Information
Size40 x 25 x 8 mm
PackagePin Type
Working VoltageDC 3 ~ 3.6V
Working CurrentAP: 169mA (average)/305mA (peak)@3.3V
STA: 164mA (average)/197mA (peak)@3.3V
Working Temp-40°C ~ 85°C
Storage Temp-40 ~ 125°C
Storage Humidity5 ~ 95% RH (non-condesation)
InterfaceUART, Ethernet Port, GPIO
Serial Port
Port Number1*TTL
Interface PinTX/RX/RTS/CTS (hardware flow control)
RS485 PinYes
Baud Rate300 bps ~ 460.8K bps
BufferTX: 4K bytes, RX: 4K bytes
Data Bit5, 6, 7, 8
Stop Bit1, 2
Wireless Parameter
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: -89dBm
802.11g: -81dBm
802.11n: -71dBm
Data SecurityWEP / WPA-PSK / WPA2-PSK
Encryption: WEP64 / WEP128 / TKIP/AES
Parameter ConfigurationWeb Server, Network AT Command, Serial AT Command
Wireless Network TypeAP, Station, AP+STA Mode
Max STA Number in AP Mode32
Transmission Distance3dbi I-PEX external antenna
Max 280m (open horizonm , no obstacle isituation)

User Manual

[Datasheet] USR-WIFI232-B2 Datasheet | download
[User Manual] USR-WIFI232-B2 Hardware Manual | download
[User Manual] USR-WIFI232-B2 User Manual V6.0 | download

Development File

[Demo Code] TCPIP Demo Code | download
[PCB Library] USR-WIFI232-A2, B2 PCB Library File | download
[Development Doc] Usrlink Fast Networking Protocol Instruction and Demo | download

Application Software

[USR-VCOM] Virtual Serial Software V3.7.1.520 | download
[USR-TCP-Test] Testing Software | download
[USR-TCP-Test_android] Testing Software | download
[USR-WIFI232-Setup] Setup Software | download
[Settings Utility] USR-WIFI232-B2 Settings Utility | download

Product Certificates

[Certificate] WIFI High Performance CE FCC ROHS WEEE Certificate | download

Company File

[Product Catalog] USR Product Catalog | download



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