In a wave gear device, an annular rigid externally toothed gear is disposed on the inner side of a cup-shaped flexible internally toothed gear. The electronic circuit includes a data fuse coupled to a data node and a reference fuse coupled to a reference node. A Woutf correction processing portion corrects the output power limit value given to a motor power calculating portion to a motor power command value at a timing when at least one of the currents IB1, IB2, and IBT reaches the threshold. Then, a relier of the campaign can acquire private information that were not able to be acquired only with the POS system.