IEM304-4D Serial Server Module
  • 1×10/100Base Ethernet Port, 4× TTL Serial Ports
  • 4-Port Industrial Embedded Serial Server Module
Features and Benefits
  • Support UDP, TCP, Modbus, HTTPD, WebSocket protocols, support virtual com port
  • Support CAN to serial conversion, transparent transmission, transparent transmission with identification, format conversion, Modbus, etc,.
  • Compact design for easy installation, maintenance and PCBA
  • Supply voltage: 3.3V (DC 3~3.6V)
  • Work in-40~85℃ industrial working temperature
  • Overview
  • Specifications
  • Downloads
  • Models
Product Description

IEM304-4D is an industrial class embedded serial port server module, can be embedded within a serial device, adding an Ethernet port to enable network monitoring and control of the serial device. The server module is integrated serial port device networking, Modbus gateway, CAN relay and CAN serial port and other functions. It has 1 10/100Base Ethernet interface and 4 TTL serial ports. It can be embedded mounted to meet the requirements of various industrial buses or network field.

The server module can be managed via WEB and supports various network protocols, such as IP, ARP, UDP, TCP, ICMP, HTTP, Modbus TCP, Modbus RTU / ASCII, HTTPD, WebSocket, RealCOM, RFC2217, DHCP Client, DNS, etc. Its serial port supports various network transmission modes, such as UDP, UDP Multicast, TCP Client / Server, Pair Connection Master / Slave, Modbus TCP / RTU / ASCII, Httpd Client, WebSocket Client, etc. It supports CAN and serial port interface conversion, and virtual serial port function. The system provides user permission management, supporting online restart, upgrade and factory reset.

The 4 port embedded server module supports hardware watchdog, and reset, factory settings restore, designed with indicators. It features low power consumption, wide temperature range, compact modular design. The surface mounted female header is easy to easy and maintain, flexible for platemaking and customize interface connection mode. Developed with industrial components, high performance low power processor, the module can work reliably in multiple harsh environments with -40℃ ~ + 85℃ wide temperature range. The products can be widely used in industrial automation, comprehensive energy, intelligent transportation, smart city, smart mining and other fields.

Features and Benefits
  1. Serial port supports UDP, UDP Multicast, TCP Client/Server, Modbus RTU Master/Slave, Modbus ASCII Master/Slave, RealCOM_MCP/CCP/MW, Pair Connection Master/Slave, Httpd Client,WebSocket Client
  2. Serial baud rate 600bps-921600bps
  3. Support multiple data packaging mechanism to enable conversion from Serial to Ethernet
  4. Support serial port parameters, working mode, send and receive frame counts
  5. Support network address static configuration and DHCP protocol dynamic acquisition
  6. Support user permission management
  7. Support the network logging, remote server monitoring
  8. Support online upgrade and factory reset


Serial Port Working Mode

UDP, UDP Multicast, TCP Client, TCP Server, Modbus RTU Master, Modbus RTU Slave, Modbus ASCII Master, Modbus ASCII Slave, RealCOM_MCP, RealCOM_CCP, RealCOM_MW, Pair Connection Master, Pair Connection Slave, Httpd Client, WebSocket Client

System Management

DHCP Client, DNS

User permission management

Serial port statistics, network log

Serial port restart, device reboot, connection reset after idle for some time

Upgrade and factory reset


Ethernet Port

1×10/100Base-T(X) auto-sensing Ethernet pin, full/half duplex, auto MDI/MDI-X, 1.5 kV isolation protection, built-in network transformer

TTL Serial Port

Type: 3.3V TTLport

Baud rate: 600bps-921600bps

Data bit: 7bit, 8bit

Stop bit: 1bit, 2bit

Parity bit: None, Odd, Even

Status LEDs

Support the RUN, Ethernet port Link/ACT, Ethernet port speed, serial port indicator pins

Power Supply

Input Voltage

DC 3.3V(DC 3~3.6V)

Power Consumption

0.7W@DC3.3V (full load)


2*1.27mm pitch 2*16P surface-plated female header (pins included)

Physical Characteristic


45×32×9.9 mm


Embedded Mounted



Working Environment

Operating Temp


Storage Temp


Relative Humidity

5%~95% (non-condensing)

Industry Standard






IEM304-4D datasheet

Version 1.2

Standard Model

10/100M Ethernet Port

TTL Serial Port

Input Voltage




DC 3.3V

(DC 3~3.6V)

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