Hello, friend!
According to your requirements, you can run the following command to query the SNs of all ONTs connected to the MA5600:
LST-ONT::DEV=testOLT1:CTAG::SHOWOPTION=SERIALNUM;
The SN of the ONT on testOLT1 is queried, you can use the MA5600 to replace testOLT1.
Thanks!