If you are attempting to read a Laison LoRa DCU on the DCu software (GM3/GM4 Module Configure Parameter Tool) and receive the error message:

'Device is Already in AT Mode'

follow the steps below:

1. Send the following AT command:

   ATO
   

2. Then send:

   ATO0
   

3. Wait a few minutes to allow the device to exit AT mode and return to normal operation.

4. Attempt to read the DCU again.

5. If the issue persists:

   • Reboot the DCU.

   • Wait for the device to reconnect to the network.

   • Try reading the DCU again.

6. If the problem still occurs after rebooting the DCU, please contact the meter manufacturer or device supplier for further assistance.

Note: This issue typically occurs when the DCU remains in AT command mode and is unable to return to its normal communication state.