A vehicle-mounted meter system includes: an inputting and outputting circuit for data measured to show a condition of the vehicle, a control circuit for controlling the system as a whole and for procession of the data, a meter main body, and a control unit detachably attached to the meter main body. The porphyrin-peptoid conjugate according to the present disclosure has porphyrins arranged face-to-face on a helical peptoid. The first channel characterization can be based upon signals transmitted in an initial mode. The written magnetization state transition is uniquely identified from the readback pulse shape of the transition or from both the readback pulse shape of the transition and the readback pulse shape of one or more contiguous magnetization state transitions.