| 摘要 |
PROBLEM TO BE SOLVED: To improve the noise tolerance of positional information or count value information obtained from an analog output encoder having sine and cosine wave voltage outputs of a short cycle by respectively shaping output voltages of an encoder, counting the output voltages as a two-phase digital signal and continuously transmitting the count value and a conversion value of an A/D converter as serial data. SOLUTION: Two comparators 21 input analog signals of short cycle sine and cosine waves from a motor with an encoder and output two-phase rectangular waves, and a counter 23 counts the rectangular wave outputs of the respective comparators 21. Also, two A/D converters 22 convert the analog signals into digital values. A CPU 24 converts the digital values of the two converters 22 into serial ones after the count value of the counter 23 and outputs the serial ones as positional information or count value information. Here, a coefficient value to be made a full scale value that is convenient as an output value of the CPU 24 is stored in an EEPROM 26.
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