Single-communication-port electric energy meter data co-acquisition method suitable for redundant double ERTUs

The invention mainly aims to solve the problem that data communication disorder is easy to occur when redundant double ERTUs (Ethernet Remote Terminal Units) acquire data from a single-communication-port electric energy meter, and discloses a single-communication-port electric energy meter data co-acquisition method applicable to the redundant double ERTUs. The redundant double ERTUs and the single-communication-port electric energy meter are networked in an RS485 serial bus mode; then the ERTU monitors whether data transmission exists on the RS485 serial bus or not, if not, the ERTU continues to monitor whether data transmission exists on the RS485 serial bus or not after a range time delay random multiple iteration strategy is adopted by the ERTU to delay and wait for random range time, and if not, the ERTU sends a data collection command to the electric energy meter, and the electric energy meter replies data. According to the method, common acquisition of data of the single-communication-port electric ene