Abstract: A magnetic sensor device may include “A”-phase magnetic resistance pattern and “B”-phase magnetic resistance pattern which are provided with a phase difference of 90° from each other; wherein the “A” pattern is provided with “+a” phase magnetic resistance pattern and “?a” phase magnetic resistance pattern with a phase difference of 180° from each other for detecting movement of a magnetic scale, and the “B” pattern is provided with “+b” phase magnetic resistance pattern and “?b” phase magnetic resistance pattern with a phase difference of 180° from each other for detecting movement of the magnetic scale, and the “+a” pattern, the “?a” pattern, the “+b” pattern and the “?b” pattern are formed on a same face of one piece of board so that the “+a” pattern and the “?a” pattern are diagonally located and the “+b” pattern and the “?b” pattern are diagonally located.

Abstract: A slave device communicating with a host device may include a program for controlling operation of the slave device. The program may include a discriminating function for discriminating types of communication interfaces through a control part provided in the slave device which controls the communication interfaces, a communicating function for communicating with the host device through the communication interface, an analyzing function for analyzing a command transmitted from the host device by utilizing a module to execute processing corresponding to each of the communication interfaces, and a controlling function for controlling operation of the slave device depending on a command after analyzing is executed by utilizing a single module which is not dependent on the communication interfaces.