Ethernet to Serial
Serial Port to EthernetEthernet to Serial1--USR-TCP-EVB Kit
USR-TCP232-ED2/$19.60 In stock

Industrial Three Serial TTL UART to Ethernet IP Module with Modbus RTU


Power: DC 3.3/5V
1)Three UART serial
2) 10M/100M Ethernet port(MDI/MDIX).
Certificate: CE, FCC, ROSH, WEEE.

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USR-TCP232-ED2 is a triple serial ethernet module,which supports 3*TTL working at the same time.It is based on Cortex-M4 solution and its basic frequency is up to 120MHz. And the internal of the module integrates TCP/IP protocol stack.


  • 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
  • Multi-ports can work independently at the same time
  • Can distinguish which serial port connects to the device via port number
  • Support virtual serial port and provide corresponding software USR-VCOM
  • Serial baud rate from 600bps to 1024K bps;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
  • Reload button,one key to restore default settings
  • 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 one channel Websocket,realize bidirectional transparent transmission bewteen webpage and serial 0
  • Support Modbus RTU to Modbus TCP
  • Support UDP broadcast function


  • Industrial automation control for data transmission.
  • Security monitoring, CCTV, entrance guard system, Building automation system
  • Smart home: smart switch, thermos controller.
  • Environmental monitoring, temperature and humidity monitoring.
  • Logistic transportation supervision and location system.

Basic Information
VoltageVCC DC 3.0V~3.6V
VDD DC 4.75~7.0V
Current120mA (aver) / 125mA (max) @3.3V
Working Temp-40 ~ 85°C
Storage Temp-40 ~ 105°C, 5 ~ 95% RH
Size44.45 x 31.75 x 15.4 mm
Serial Port
Baud Rate600 bps ~ 1Mbps
Data Bit5, 6, 7, 8
Stop Bit1, 2
Check BitNone, Even, Odd, Space, Mark
RS485 Control PinYes
BufferTX: 2Kbytes , RX: 2K bytes
Ethernet Port
Speed10/100 Mbps, Auto MDI/MDIX
ProtocolIP, TCP, UDP, DHCP, DNS, ARP, ICMP, Websocket, HTTP Client, Modbus TCP
BufferTX: 16K bytes , RX: 16K bytes
Protection1.5KV electrical isolation

User Manual

[Datasheet] USR-TCP232-ED2 Datasheet | download
[AT Command] USR-TCP232-ED2 AT Command Set | download
[User Manual] USR-TCP232-ED2 Hardware Manual | download
[User Manual] M4 Series Product User Manual | download
[Selection Table] Ethernet Module Selection Table | download

Development File

[Customized Webpage] M4 Series Customized Webpage | download
[Demo Code] TCPIP Demo Code | download
[Config Protocol] E45&M4 Series Config Protocol V1.4 | 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-M4] USR-TCP232-M4K3 Setup Software | download

Product Certificate

[Certificate] M4 Series CE FCC ROHS WEEE 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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USR products are exported to more than 100 countries and regions, get approvals like CE, FCC, ROHS, CCC, KC, IC, SRRC, etc.
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