Industrial Super Lan Port Serial TTL UART to Ethernet Module

USR-K3 is an embedded serial networking module,whose function is to realize bidirectional transparent transmission between TTL and Ethernet.

  • 1 TTL Serial Ports Supporting Data Rates of up to 1024Kbps
  • Operation temperature Range of -40° ~85℃
  • Support serial configure protocol, network configure protocel and WEB page configure
General Details

Introduction of  Lan Port TTL Ethernet Module

USR-K3 is the high-performance and industrial version of Super LAN Port TTL Ethernet Module. The amazing part of K3 lies in its Ethernet port integration design. K3 is based on Cortex-M4 solution, which has high speed,high stability and basic frequency up to 120MHz.

Features of TCP Modules

  • Cortex-M4 kernel,industrial working temperature range and TCPIP protocol stack.
  • Auto-MDI/MDIX,RJ45 port with 10/100Mbps
  • TCP Server,TCP Client,UDP Client,UDP Server and HTTPD Client work mode
  • Support virtual serial port and provide corresponding software USR-VCOM
  • Serial port highest baud rate from 600bps to 1024Kbps, Check bit of None,Odd,Even,Mark and Space
  • DNS and DHCP supported
  • Provide PC TCP/IP socket programming example such as VB,C++,Delphi,Android and IOS
  • Built-in webpage;also can customize webpage for users
  • RJ45 with Link/Data indicator light,built-in isolation transformer and 2 KV electromagnetic isolation
  • The global unique MAC address bought from IEEE (begin with D8-B0-4C);user can define MAC address
  • Support upgrade firmware via network
  • Support keepalive,rapidly detect dead links
  • Support account and password,can be used to page login and network settings
  • Support Websocket,realize bidirectional transparent transmission bewteen webpage and serial
  • Support Modbus RTU to Modbus TCP
  • Support UDP broadcast function

Application field of TCP Modules

  • Industrial data transmission, industrial automation
  • security and protection monitoring, public security
  • Smart home, power control, environmental monitoring, intelligent agriculture
  • Door check on work attendance system, POS system, rice selling system
  • Building automation system, power monitoring, self-service banking system, telecom machine room monitoring

K1 K2 K3 Function Comparison


Application of TCP Modules

Kx application-

Various parameter setting method

Software Settings
Download settings software, search Ethernet 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 Ethernet 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.

Images of TCP Modules

uart ethernet

System Information
Basic Frequency120MHz
Flash512K byte
Port Number1
Interface Standard8 pin RJ45
Rate10/100 Mbps, MDI/MDIX, auto switch between cross and direct connection
Protection2KV electromagnetism isolation
Network ProtocolIP, TCP, UDP, DHCP, DNS, HTTP, ARP, ICMP, Web socket, Httpd client
BufferMax. 16k bytes buffer
Port Number1
Interface StandardTTL: pin type 3.3V
Data Bits5, 6, 7, 8
Stop Bit1, 1.5, 2
Check BitNone, Even, Odd, Space, Mark
Baud RateTTL: 600 bps ~ 1024K bps
Flow ControlRTS/CTS
BufferSend and receive 2k bytes respectively
RS-485 Pull-up and Pull-Down ResistorNull, reserved 485 send-receive control pin
Virtual Serial(USR-VCOM)Windows 2000 or higher (32 bit/64 bit)
ConfigurationBuilt-in webpage, computer set-up software, serial command
Basic Parameter
Size33.02 x 19.01 x 19.15 (mm) (including clips)
Operating Temp.-40 ~ 85°C
Storage Temp.-40 ~ 85°C, 5 ~ 95% RH
Input VoltageDC 3.3V
Working Current120mA (115~125) @ 3.3V
CertificateCE, FCC, RoHS
Warranty2 years










*Leave message:

Verify Code: captcha