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HSMS can check the connection status through link test, but
SECS-I does not have a procedure to check the connection status. Because of
, XCom does not automatically manage the connection state.
So generally, customers using SECS-I send and receive S1F1 messages at regular intervals.
Program the connection status based on the results.

In some cases, the List Item type cannot be fixed.
In this case, it is treated as variable data (L n).