| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a game machine which hardly allows transmission errors in a serial communication method even when power-supply lines for supplying power from a power-supply device are separately provided on a main control board and a sub-control board. <P>SOLUTION: A ground line 19B of a serial transmission line 19 is formed of two electric wires 19C, 19D, and the ground line 19B is configured to show higher conductive performance than a signal line 19A to hardly allow a potential difference to be generated between grounds of the main control board 15 and the sub-control board 16. As a result, even when the potential difference is likely to be generated between the grounds of the main control board 15 and the sub-control board 16 due to the difference in lengths and flowing currents of a first power-supply line 17 and a second power-supply line 18, two electric wires 19C, 19D suppress the potential difference. Consequently, since the fluctuation of a reference potential of the serial transmission line 19 is suppressed, and the transmission errors are hardly generated even when the second power-supply line 18 is provided separately from the first power-supply line 17. <P>COPYRIGHT: (C)2013,JPO&INPIT |
