Patent ID: 8346494
Filing Date: 2013-01-01
Classification: G01D

Abstract:
1. A physical quantity measurement device comprising: a terminal unit having a power terminal, an output terminal, and a ground terminal, said power terminal and said output terminal being adapted in use to be connected to an external device; a sensor configured to detect a predetermined physical quantity; a storage unit configured to store predetermined property information; an output unit configured to output the physical quantity detected by said sensor to said external device; a communication unit configured to establish serial communications with said external device; a control unit configured to have an adjusting mode in which said control unit updates said property information stored in said storage unit to receive said property information from said external device, and a normal mode in which said control unit does not update said property information stored in said storage unit; and a discriminating unit configured to judge whether or not an electrical potential of each of said power terminal and said output terminal satisfies a predetermined condition, said discriminating unit being configured to decide that said external device requests said adjusting mode when the electrical potential of each of said power terminal and said output terminal satisfies the predetermined condition, and said discriminating unit being configured to decide that said external device requests said normal mode when the electrical potential of at least one of said power terminal and said output terminal does not satisfy the predetermined condition, wherein said control unit is configured to select said normal mode when said discriminating unit decides that said external device requests said normal mode, and is configured to select said adjusting mode when said discriminating unit decides that said external device request said adjusting mode, and wherein said communication unit is configured to use said power terminal in order to receive a serial signal from said external device.