| 摘要 |
A transmitter having a battery (6) therein and which is driven by a voltage supplied from the battery is comprised of an input key pad (4) having operation keys for inputting transmission data, a data length detecting unit for detecting a length of the input transmission data, a voltage supervisory unit (8) for detecting an output voltage of the battery, a discharge characteristic memory (P) for previously storing a discharge characteristic of the battery, and a calculating unit (1) for calculating data length which can be transmitted on the basis of a voltage value detected by the voltage supervisory unit and discharge characteristic data stored in the discharge characteristic memory, wherein when the data length detected by the data length detecting unit is longer than the data length which can be transmitted, the transmission data is inhibited from being transmitted. Thus, communication can be increased in reliability. <IMAGE> |
