| 摘要 |
PURPOSE:To prevent damage to a controller connected to a relay control circuit, by locating a diode between a connection terminal of the relay control circuit and a reference potential. CONSTITUTION:A plurality of controller connection terminals T1 to T4 to which a plurality of controllers are connected through data lines DL1 to DL4 is provided in a relay control device 20 which is connected to a game machine body through a data line DL 20. Further, diodes D1 to D3 are inserted between Data lines DL2 to DL4 of the relay control circuit on the side which is connected to the controllers 12a to 12d, and the ground potential. With this arrangement, even though a controller 12 connected to one of data line DL2 to DL4 is inappropriate, a pull-up resistance in the relay control circuit prevents source voltage which is produced at the terminal connected with the controller from being applied as a voltage reverse to the controller, thereby it is possible to prevent a semiconductor circuit in the controller from being damaged. |
