Dual TTL UART to Ethernet Modules

Dual TTL UART to Ethernet Module

Model: USR-TCP232-E2

USR-TCP232-E2 is a Dual TTL UART to Ethernet Module, which supports 2*TTL working at the same time.
  • Industrial TI M4 Solution
  • 2 TTL Serial Ports, 2Kv isolation protection
  • Modbus RTU to Modbus TCP

Dual TTL UART to Ethernet Modules

General Details

Introduction of TTL to Ethernet Module

This is a serial TTL to Ethernet module, used for data transparent transmission. USR-TCP232-E2 is a dual serial ethernet module, which supports 2*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.


Features of TTL to Ethernet 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

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


Application Field of TTL to Ethernet 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


Data Submitted to Web Server Directly

TTL to Ethernet Modules which transmit Data to Web Server Directly


Work Mode of TTL to Ethernet Modules

TCP Client Mode

Module starts connection to all set TCP Server, if connection fails, module will try to reconnect till success if connection succeeds, Server will transmit data with serial device.

Work Mode of TTL to Ethernet Modules, TCP Clent Mode


TCP Server Mode

Module monitors the set and waits for TCP Client to connect data sent by serial device will transmit to all successfully-linked Clients via module.

Work Mode of TTL to Ethernet Modules TCP server mode


UDP Mode

Module sends data of serial device to the set network device. Module monitors port and sends the received data to serial device.

Work Mode of TTL to Ethernet Modules, UDP Mode


Application of TTL to Ethernet Modules

Remotely manage multiple serial devices

Remotely manage multiple serial devices, Application of TTL to Ethernet Modules


Use network to extend serial communication distance

Use network to extend serial communication distance, Application of TTL to Ethernet Modules


Multiple PC to remotely manage serial device

Multiple PC to remotely manage serial device, Application of TTL to Ethernet Modules


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

Open your browser and inter the default IP address of the Ethernet Modules.

Open the login page of Serial Server, Enter the user name and password (default admin).

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.


System Information  
Processor Cortex-M4
Basic Frequency 120MHz
Flash 512K byte
Port Number 1
Interface Standard 8 pin RJ45 (with network transformer)
Rate 10/100 Mbps,MDI/MDIX,auto switch between cross and direct connection
Protection 2KV electromagnetism isolation
Network Protocol IP, TCP, UDP, DHCP, DNS, HTTP, ARP, ICMP, Web socket, Httpd client
Receive Buffer Max. 16k bytes buffer
Port Number 2 (2*TTL, can work at the same time)
Interface Standard TTL: 2.54 pin 3.3V
Data Bits 5, 6, 7, 8
Stop Bit 1, 1.5, 2
Check Bit None, Even, Odd, Space, Mark
Baud Rate 600 bps ~ 1024K bps
Flow Control RTS/CTS
Buffer Send and receive 2k bytes respectively
RS-485 Pull-up and Pull-Down Resistor Null, reserved 485 send-receive control pin
Virtual Serial(USR-VCOM) Windows 2000 or higher (2 bit/64 bit)
Configuration Built-in webpage, computer set-up software, serial command
Basic Parameter  
Size 55 x 30 x 23.2 (including Ethernet port and pin)
Operating Temp. -40 ~ 85°C (industry)
Storage Temp. -40 ~ 105°C, 5 ~ 95% RH
Input Voltage DC 3.3 / 5 V
Working Current 120mA @ 3.3V
120mA @ 5V
Power <1W
Certificate CE, FCC, ROHS
Warranty 2 years
Accessory Null

How to Buy

Official Online ShopClick to order USR-TCP232-E2
Alibaba Online ShopClick to order USR-TCP232-E2
Contacts SalesYou can leave a message for our sales below.








3.0-3.6 V


4.75–7.0 V

4.75 – 7.0 V


Baud rate(bps)



Serial number





Modbus gateway --
Websocket --
Customize webpage --


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