• Industrial-Grade Embedded Serial/CAN Server Module
Features and Benefits
  • 1×10/100Base Ethernet port, 2×TTL serial ports, 2×TTL CAN ports
  • Support UDP, TCP, Modbus, HTTPD,WebSocket protocol and virtual com port
  • Support CAN to serial conversion; support transparent conversion, transparent conversion with specification, format conversion, and Modbus
  • 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

The IEM304 Series industrial serial server module is used for adding an Ethernet port to enable network monitoring and control of the serial device. This allows users to remotely monitor and control the serial device over a network, reducing the need for on-site maintenance and improving efficiency. The embedded mounting IEM304-2D-2C module integrates serial device networking, CAN device networking, Modbus gateway, CAN relay and CAN to serial conversion and other functions. The IEM304-2D-2C supports one 10/100Base-T(X) port, 2 TTL serial ports and 2 TTL CAN ports.

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 CAN port or 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 com port function.


The 4 port embedded server module supports hardware watchdog, and reset, factory reset, 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 PCBA 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

CAN port supports UDP, UDP Multicast, TCP Client/Server, Pair Connection Master/Slave, Modbus TCP Slave,Relay Mode,CAN to Serial,Httpd Client,WebSocket Client operating modes

CAN baud rate 5kbps-1000kbps

CAN support Normal, Loopback, Listen modes

Support CAN ID filter

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, CAN to Serial and other conversion modes to realize conversion from serial to ethernet, CAN or Modbus RTU/ASCII protocols

Serial baud rate 600bps-921600bps

Support data packaging mechanism to enable conversion from CAN or serial to Ethernet

Support serial port and CAN port communication parameters, working mode, send and receive frame counts

Support network address static configuration and DHCP protocol dynamic acquisition

Support user permission management

Support the network logging, remote server monitoring

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, CAN to Serial

CAN Port Working Mode

UDP, UDP Multicast, TCP Client, TCP Server, Pair Connection Master, Pair Connection Slave, Modbus TCP Slave, Relay Mode, CAN to Serial, Httpd Client, WebSocket Client

System Management

DHCP Client, DNS

User permission management

Serial port, CAN port statistics, network log


Upgrade and factory reset



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


Type: 3.3V TTL CAN port

Baud rate: 5kbps-1000kbps

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 mounted 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







IEM304-2D-2C datasheet

Version 1.1

Standard Model

10/100M Ethernet Port

TTL Serial Port


Input Voltage





DC 3.3V

(DC 3~3.6V)


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