| 摘要 |
<p>PURPOSE:To inform the lowering of the potential of a battery from a remote place by inserting information showing the lowering of the voltage of the battery as a part of inside information of a general frame, which goes aroung the transmission line of a system to transmit it to other devices. CONSTITUTION:When the potential of the battery is lowered, a signal is generated at an interruption line 91 from a comparator 27. A processor 22 receives the signal, inserts it as a part of inside information of the general frame going around the transmission line of the system and writes it into the transmission buffer of a transmission line control circuit. Then, at the time of requiring to send the frame to the transmission line control circuit 21, the frame is sent for another data transmission device by way of the transmission line 11. In the other data transmission devices, interruption is generated in the processor 22 when the reception of the frame is finished. The processor 22 gets interruption, reads the content of a reception buffer to decode it and displays the lowering of potential on a display device.</p> |
