Hi, I cannot turn on the relay of my 4 AI 4DO module and I don't know what the problem is. The problem may be software related. The official program does not require specific commands to operate.

This usually means that there is a software problem when trying to operate the relay, even if the official program theoretically does not require additional commands to control the relay. If this happens, it may be helpful to check the following aspects:

1. Configuration settings: Make sure the relay is configured correctly, including but not limited to parameters such as address and mode.
2. Communication problems: Check whether the communication between devices is normal, including data line connection, baud rate setting, etc.
3. Power supply: Confirm that the power supply to the relay module is stable and the load of the relay contacts is within the rated range.
4. Software compatibility: Make sure the software version used is compatible with the hardware device. Sometimes software updates may affect the compatibility of old devices.
5. Troubleshooting: Check for error codes or warning messages, which often provide specific reasons for the failure.

If none of the above steps can solve the problem, it is recommended to contact the technical support department of the EBYTE device manufacturer for further assistance. We provide 24/7 technical support: ebyteiot@cdebyte.com