| 摘要 |
PURPOSE:To reduce the power consumption and thus eliminate a replacement of the batteries for a long time, by carrying out a transmission of data when the input data changes and giving a data transmission with a fixed time interval when the input data has no change respectively. CONSTITUTION:The pulley 4 is turned according to the change of water level, and this turning motion is converted into a digital data through the A-D converter 5 to be converted into a pulse series by the parallel-serial converting circuit 6. This pulse series is converted into the optical signals by the light emitting element 7 to be transmitted via the optical fiber cable 8. The BUSY signal 12 at the moment when the input data changes is detected by the fall detecting circuit 13, and then the power supply switch 14 is closed to perform a transmission of data. The switch 14 is closed by the automatic starting circuit 15 and with every second T1 for a transmission of data. This transmission of data is monitored by the information renewal check timer 16 at the reception part, and an external alarm is delivered in case the data is not renewed within the T2 second. |
