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Weight: 0.6000 Kgs


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CSE-H21 offers a solution to the customer who wants to add Ethernet connectivity in their system quickly, easily and economically. The CSE-H21 offers two RS232 ports and helps RS232 system gain network connectivity with just serial connection. As the CSE-H21 allows extending the distance of the serial communication system, you are able to remotely control and monitor the serial devices via Internet access no matter where you are.  The robust CSE-H21 is suitable for many industrial sites, offering stable performance, noise resistance and a wide range of operating temperatures (-40℃ ~ +70℃)




·        2 Digital Input ports (Dry contact 1 port, Wet contact 1 port)
·        1 Digital Output Port (Relay interface)
·         Modbus/TCP monitoring and surveillance *
·         Monitoring and surveillance over the HTTP 
          (available to upload user web pages)
·         Support of control of simple logic formula (available to operate autonomously)
·         Security Functions (IP filtering, password)
·         Support of DHCP, PPPoE (available for various dynamic IP environments)
·         Support of various host connection mode (TCP server, TCP client)
·         Multiple check functions of communication conditions 
          (debugging mode, 
ezManager, TELNET)
·         Easy access by host name (DNS)
·         Available as a server by using the host name in the dynamic 
          IP environment
·         IP address notification function (DDNS) useful in the dynamic IP environment
·         Support of the easy-to-use environment setting program for PC (ezManager)
·         Support of the Modbus/TCP program for integrated management of 
          I/O equipment
·         Firmware-upgrading function over the LAN
·         Environmentally-friendly RoHS compliant

To download the following Sollae Systems' ezManager, you must have iTunes

Android & TCP/IP client versions


Document Type Revision File Name 
Datasheet 1.0 CSE-H21-Datasheet

User Manual   CSE-H21-UserManual
CE Certificate   CE certificate
FCC Certificate  
FCC certificate
Declaration of ROHS Compliance   Declaration of RoHS Compliance



How to use SSL
How to use SSH
Sending MAC Address function
IP Change Notification(DDNS)







Secure Communication through the Internet
Extending distance between two devices through the LAN
Remote Weather Monitoring System
Remote Console Monitoring
Automatic Fair Collection System




ezTCP management program (ezManager v3.2D) icon
Socket program for test (ezTerm v1.3L) icon
 Virtual COM port driver (ezVSP v4.0G)


Latest Firmware

Latest Firmware (v1.3C)
[F/W History]