USR-WIFI232-603 RS232 to WiFi Converter

Communication Expert of Industrial IOT
USR-WIFI232-603 RS232 to WiFi Converter
USR-WIFI232-603 RS232 to WiFi Converter
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Price: $41.60
Availability: In Stock
Model: USR-WIFI232-603 V2
Average Rating: Not Rated

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User Manual:

Ticket System: submit your ticket at if you have technical questions about the item.


USR-WIFI232-603 V2 is a serial wifi converter, which can realize bidirectional transparent data transmission between RS232 and Wifi. And the device has a rs232 terminal interface.

Basic Information

Size 84 x 84 x 25 mm
Working Voltage DC 4.75 ~ 7V
Working Current 170 ~ 350 mA @ 5V
Working Temp -40 ~ 85°C
Storage Temp -40 ~ 125°C
Storage Humidity 5 ~ 95% RH (non-condesation)


  • 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.

Parameter Configuration

1)Web Server configuration. (Manual P24)

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 P25 )

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.

TCP/UDP Transparent Transmission Mode
Serial RS232 WIFI Converter WIFI232-602 work as TCP Client, TCP Server, UDP Client, UDP Server Mode.
1) In TCP Client Mode: Client connects Server automatically. User should configure the TCP Server’s IP address and Port.
2) In TCP Server Mode: The Max Client number is 32.
3) In UDP Client Mode: serial data will be sent to a fix IP address/port which you appointed.
4) In UDP Server Mode: serial data will be sent to last source IP/Port.


  • 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.

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