The application is suitable for the technical field of
Internet of Things electric energy meter, and relates to a method, medium and terminal for connecting type A expansion module of
Internet of Things meter to downlink equipment, which comprises the following steps: a downlink function unit establishes a
communication link with a downlink expansion device; the downlink function unit informs an
Internet of Things meter management module that the downlink expansion device has been connected;
the Internet of Things meter management module and the downlink function unit perform
handshake authentication;
the Internet of Things meter management module and the downlink function unit perform data interaction, including routing forwarding and security
encryption and decryption
processing of uplink communication messages and downlink communication messages according to a preset routing strategy and a security
encryption and decryption strategy; and the downlink function unit periodically sends a
heartbeat command to
the Internet of Things meter management module to maintain the connection state of the downlink expansion device. The application has the ability to connect the type A module of the Internet of Things meter to the
wireless communication or carrier communication of the downlink equipment, improves the power supply capacity of the downlink expansion device, reduces the wiring trouble of field installation, and greatly improves the networking capacity of the downlink equipment of the Internet of Things meter.