Disclosed is a method for engaging in a transaction between a consumer and a merchant. The grey level controlled on a pixel is achieved with an analog voltage that varies monotonously depending on the row associated with the pixel andor a color to be displayed. A manager enters the calibration area in a management table in association with a physical address of the first area used as the calibration area. An IC chip is placed out of the region of the surface-side glass. The compound of formula I are useful for the preparation of 1,5-benzothiazepines which are useful as enzyme inhibitors, such as protease, interleukin-1-converting enzyme, elastase or angiotensin converting enzyme, GPCR antagonists. The capacitance is determined from the measured current.