Serial RS232 RS485 to WIFI Converter with Ethernet Modbus RTU

RS232 to WIFI
RS485 WIFI ConverterIMG_6663RS232 WIFI Converter
USR-WIFI232-630/$76.60 In stock


Power: DC 5 ~ 40 V , 140 ~ 350mA @ 5V
Interface: 1*RS232, 1*RS485, 2*RJ45
Certificate: CE TELEC

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USR-WIFI232-630 Serial RS232 RS485 to WiFi Converter Server with 2 *RJ45 Port. It is used for data transparent transmission between serial device and WIFI or Ethernet. Under open horizon and no obstacle situation, the Max transmission distance is 400m with 3dbi external antenna. In AP mode,The max Station connection is 32.


  • Modbus Gateway: Modbus RTU to Modbus TCP.
  • Built -in Web Server/Webpage for configuration.
  • Websocket: support bidirectional transparent transmission between built-in webpage and serial. Webpage socket to Serial.
  • HTTP Client: send data as HTTP format automatically. Serial data submitted to server by HTTP (GET/POST).
  • Support 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.
  • RS485 Protection: : Surge protection, overvoltage protection, ESD protection.

1) Virtual serial port software(VCOM), Windows 2000 or higher (32 bit/64 bit)
Parameter Configuration:
1)Web Server configuration. (Manual P27)

2)Serial and Network AT Command.
Factory Setting:
1) Hardware reset: Press Reload button for 3S, then release it.
2) Software reset: Enter AT command mode, use AT command AT+RELD.
3) Webpage setting: “Device management page”
Firmware upgrade by webpage. ( Manual P34 )

WIFI Networking Mode
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.
2)STA: terminal of the wireless network. All communication between STAs is
through AP. e.g.: PC can work as STA.
3)AP+STA: supports one device as AT and one device as STA.

  • Industrial automation system.
  • 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
Size84 x 84 x 25 mm
Working VoltageDC 5V ~ 40V
Working Current140 ~ 350 mA (aver)@ 5V, Min: 140mA @ 5V , 60mA @ 12V
Working Temp-40 ~ 85°C
Storage Temp-40 ~ 125°C
Storage Humidity5 ~ 95% RH (non-condesation)
Ethernet Port2*RJ45, 10/100 Mbps, auto MDI/MDIX
CertificateCE TELEC
Serial Port
Interface1*RS232, 1*RS485
2 ports CAN NOT work simultaneously
Flow ControlRTS / CTS / XON XOFF
RS-485 Resistor2.2 K?
RS485 ProductionOver-voltage Protection, ESD Production, Surge Protection
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: +20 dBm (Max)
802.11g: +18 dBm (Max)
802.11n: +15 dBm (Max)
Receive Sensitivity802.11b: -89 dBm
802.11g: -81 dBm
802.11n: -71 dBm
Data SecuritySecurity: WEP / WPA-PSK / WPA2-PSK
Encryption: WEP64 / WEP128 / TKIP/ AES
Transmission DistanceMax 400m (3dbi external antenna,
open horizonm and no obstacle isituation)
Wireless Network TypeAP, Station, AP+STA Mode
Max STA Number in AP Mode32
Parameter ConfigurationWeb Server, Network AT Command, Serial AT Command
Warranty2 years
SoftwareVirtual Serial / VCOM software
Accessory5V1A power supply, COM cable, 3dbi antenna

User Manual

[Datasheet] USR-WIFI232-630 Datasheet | download
[User Manual] USR-WIFI232-630 User Manual V1.0.4 | download

Development File

[Development Doc] Usrlink Fast Networking Protocol Instruction and Demo | download
[Demo Code] TCPIP Demo Code | 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-W6xx Settings Utility | download

Product Certificates

[Certificate] USR-WIFI232-630 CE TELEC Certificate | download

Company File

[Product Catalog] USR Product Catalog | download


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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