
Принятый ответI suggest you check this post, it will be helpful to you
https://www.chanelink.com/community/post/3844




When I tried to connect RDWorksV8 to the RDC6685U controller, the system was unable to establish communication. I checked the USB and Ethernet connections and confirmed that the interface was not loose, and the indicator light was also on normally. After replacing the data cable, restarting the computer and controller, communication still failed. Who can help me solve it? Thanks!





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Принятый ответI suggest you check this post, it will be helpful to you
https://www.chanelink.com/community/post/3844






Please check if the RDWorksV8 settings are correct
Click on "Settings" ->"Controller Settings" in the menu bar, and confirm that the controller model is selected as RDC6685U.
Set connection port
In RDWorks, click on "Tools" → "Controller Settings".
Make sure you have selected the correct connection port. If you are connected via USB, select USB.
Select the correct port and ensure that no other devices are occupying it.
Check the connection method
Confirm if you have selected the correct connection mode, such as USB or serial port (RS232).






Ensure that the driver for the RDC6685U controller is installed correctly. Suggest downloading and installing the latest driver program. Check if the controller is recognized in the device manager to ensure that there are no warnings of "unrecognized device" or "device failure".





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