Matsushita Electric Industrial Co., Ltd.

Norio Komaki

Akitoshi Aritaka

In a portable wireless telephone capable of providing a cellular mode which allows users to place or receive telephone calls through a cellular telephone network and a cordless mode which allows the users to place or receive telephone calls through an associated base unit of a cordless telephone, a battery condition is monitored to check whether or not the battery energy is so lowered that the cellular mode becomes inoperative. An LCD unit displays a warning if the battery energy is lowered down to such a low level. However, a micro computer equipped in this portable wireless telephone allows the users to use this portable wireless telephone as a cordless telephone, as long-as the remaining battery energy is sufficient enough to do so. Accordingly, this portable wireless telephone can be still activated in the cordless mode even if it cannot be no longer used as a cellular telephone.

Portable wireless telephone apparatus with use specific power monitoring

In a portable wireless telephone capable of providing a cellular mode which allows users to place or receive telephone calls through a cellular telephone network and a cordless mode which allows the users to place or receive telephone calls through an associated base unit of a cordless telephone, a battery voltage is monitored to check whether or not the battery voltage is so lowered that the cellular mode becomes inoperative. An LCD unit displays a low-voltage warning if the battery voltage is lowered down to such a low level. However, a micro computer equipped in this portable wireless telephone allows the users to use this portable wireless telephone as a cordless telephone. Accordingly, this portable wireless telephone can be still activated in the cordless mode even if it cannot be no longer used as a cellular telephone.

A data terminal device, having a plurality of protocols stored therein, has a data transmitting mode and a data receiving mode. When in a transmitting mode, the terminal device transmits to another data terminal initial data according to one of the protocols. The terminal device then awaits a feed back signal from the other terminal device. If a feed back signal is received, the terminal device transmits the data. If no feed back signal is received, the terminal device transmits a break signal which indicates that a change in receiving protocol is required. When in a receiving mode, the terminal device receives data according to one of the protocols. If data is received having the same protocol as that of the receiver of the terminal device, a feed back signal is transmitted to the other terminal device. If the data protocol received is different, no feed back signal is transmitted, and the terminal device awaits a break signal indicating that change in receiving protocol is required.

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Fukuoka, Japan

Norio Komaki