Secure RS232 to Ethernet Network Device Server ezTCP CSE-H25

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The EZTCP CSE-H25 is an RS232 to Ethernet converter with enhanced security protocols embedded. It basically supports conversion functions (serial to TCP/IP and vice versa) to enable your RS232 serial devices to be controlled and monitored over the network.

The CSE-H25 serial to Ethernet converter comes preloaded with various communication functions (DNS, DDNS, Telnet COM Port, etc.) and strong security functions (SSL, MAC/IP filtering, etc.) along with multi-monitoring that allows your serial device to be monitored by multiple hosts at the same time.

The CSE-H25 can be applied in various communication environments such as Secure Communication through the Internet, Multi Monitoring, and Control PLC over Internet.


  • Multi-Monitoring (maximum 8 channels)
  • Industrial temperature range (-40℃ ~ +85℃)
  • SSL, SSH security function
  • Separator settings for packet fragmentation
  • Virtual COM port (ezVSP) provided
  • Serial tunneling


  • Serial Physical Interface
    • Serial Interface: 1x RS232
    • Connector: 9 pin DSUB Male
  • Serial Port Property
    • Baudrate: 300bps ~ 230,400bps
    • Data Bits: 8 bits, 7 bits with Parity
    • Parity: None, Even, Odd, Mark, Space
    • Stop Bit: 1, 1.5, 2
  • Network Interface
    • 10Base-T/100Base-TX Ethernet (RJ45)
    • Ethernet Speed Auto Sense
    • 1:1 or Cross-over Cable Auto Sense
  • Software Functions
    • Protocols
      • TCP, UDP, IP ICMP, ARP, Ethernet, TELNET
        Telnet COM Port Control Option (RFC 2217)
    • Security
      • SSL (Secure Socket Layer)
      • SSH (Secure Shell)
      • IP & MAC filtering - Restrict host or network
      • Password for Configuring
    • Communication Mode
      • TCP Server (T2S)
      • TCP Client (COD)
      • TCP Server/Client with AT Command (ATC) - Patent
      • UDP Mode (U2S)
    • Additional Functions
      • Multi-monitoring(Max. 8 TCP connections simultaneously)
      • Remote Debug Function
      • TCP Server / Client Mode
      • Sending MAC address Option
  • Indicators (LEDs)
    • Power: Red
    • Status: Yellow
    • Ethernet Link: Green
    • Ethernet RXD: Yellow
    • Ethernet TXD: Green
  • Management:
    • ezManager: Configuration and Monitoring through Network and Serial
    • TELNET: TELNET Login
    • AT Command: Configuring in ATC Mode - Patent
  • Supplementary Software
    • ezManager: Configuration Tool for Windows through Network and serial
    • ezVSP: Serial to Network Virtual Driver for Windows
    • ezTerm: Simple TCP/IP Communication Test Tool
  • Dimensions
    • Size 89mm x 57mm x 24mm
  • Operating Environments
    • Input Voltage: DC 5±0.5V
    • Current Consumption: 200mA Typical
    • Operating Temperature: -40℃ ~ +85℃
    • Storage Temperature: -40℃ ~ +85℃
  • Certifications
    • KC: Registration(KN 22, KN 24)
    • CE: EMC 2014/30/EU, RoHS 2011/65/EU
    • FCC: FCC Part 15 Subpart B, Class A

 Package includes:

1X CSE-H25 Secure RS232 Ethernet Device Server

Documentation & Resources:


CSE-H25 Introductory video