| Introduction

The 75F CCU can be connected to either Wi-fi or the Ethernet LAN to start communicating to the cloud. 

In order to support such places the 75F CCU will start having USB port, that can connect to a USB to Ethernet adapter, which can be connected to the Ethernet LAN.

Not all CCUs will have this feature. Any CCU that is received in 2022 and later supports this feature. 

Note: When connecting ethernet to the CCU, it is known that the CCU will reboot each time you undock the tablet from the CM. Perform as much pairing and configuration before docking the tablet again. 

| Schematic

The Ethernet LAN in a building can be connected to the CCU tablet or the CM board. 

Below is the schematic to connect the to Ethernet LAN to CM.


Below is the schematic to connect the to Ethernet LAN to USB hub in the CCU tablet.

| Verify Connection

Once the connection is made as per the schematic provided,  with the network open and DHCP enabled, the CCU will connect automatically to the network and the icon (<->) will appear as an indication that CCU is connected. 


|Configuring a Static IP

To configure a static IP. 

  • Click the settings icon on the notification window of the CCU.


The settings screen is displayed


  • Click More
  • Click the Ethernet option.  


  • Click Ethernet Information to set up a static IP.


  • Enter the static IP address you want to configure.
  • Enter the Gateway Address and DNS address
  • Click confirm to set up the static IP.

The static IP is configured.


It is observed that the CCU starts communicating over the Ethernet LAN.


| Types of Ethernet Connection

The Ethernet LAN in a building can be connected to the CCU tablet or the CM board. both of these types of connections have their pros and cons.

The table below delves into a few details for both ethernet connections and lets the user decide what connection type would best suit their requirement.

Ethernet connection to CCU Tablet Ethernet Connection to CM Board

CPU Utilization:

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CPU Utilization:

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Ram Utilization:

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Ram Utilization:

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Internet Speed Test:


Internet Speed Test:


The results in the table are based on the tests carried out on different types of setup in-house.

It is evident from the above table the best results are when the ethernet cable is connected to the CCU tablet than the CM.

Note: If the requirement demands the use of multiple USB options Modbus converter along with Ethernet, then use a USB HUB connected to CCU USB PORT.

| Ethernet Adapter Recommendations & Limitations

The Ethernet adapters TP-Link & Cable Matters were the widely used ones available in the market.

The adapters were put to use internally to determine what was best suited for the connection with the CCU.

From the test results the TP-Link Ethernet Adapter was found to be the best option for connection with CCU over ethernet over the Cable Matters.

The limitation the Cable Matters ethernet adapter had was, that when the CCU was connected with Cable Matter for connection over ethernet it resulted in frequent reboots of the CCU when undocked and docked back to the CM, which was not a good sign.

Hence the TP-Link Ethernet Adapter is highly recommended for use.

| CCU Network Watchdog Timeout

The CCU Network Watchdog Timeout is a tuner in the system that defines the time after which the CCU auto reboot triggers when the Ethernet connection is disconnected.

| CCU Logs

CCU logs form an integral part of the 75F system, and this has the history of what has traversed in the CCU. 

Generating a CCU log would help investigate any issue that CCU faces, and this helps developers rectify the issue detected.

For more information on how to generate the CCU logs refer to the following articles




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