Radio pager receiver capable of informing whether or not memory

Details Radio pager receiver capable of informing whether or not memory Radio pager receiver capable of informing whether or not memory

1987-01-29

1988-10-18

Caldwell, Sr., John W.

Communications: electrical

Continuously variable indicating

With meter reading

3403111, 455343, G08B 522

Patent

active

047790911

ABSTRACT:
A radio pager receiver has a memory with a message area, and an additional area and a message processor for processing a message signal into messages and to store the messages in the message area. A specific datum is written (S6) in the additional area by the message processor. Although the message processor and the memory are activated by main electric power of a power supply circuit, only the memory is backed up by backup electric power of a backup power source. When the memory and the message processor are activated after once deactivated, the message processor judges (S2) whether or not the specific datum is correctly kept. The message processor controls display (S3 and S4) of a result of judgement. In the message area and the additional area, entries may be erased (S8) by the message processor when the specific datum is not correctly kept. When the specific datum is correctly kept, the message processor may make a display unit display each of the messages together with an announcement which indicates whether or not the each of the messages is subjected to a backup operation by the backup electric power.

REFERENCES:
patent: 4232377 (1980-11-01), Tallman
patent: 4368532 (1983-01-01), Imazeki et al.
patent: 4369443 (1983-01-01), Giallanza et al.
patent: 4646307 (1987-02-01), Nishimura
patent: 4658352 (1987-04-01), Nagasawa
patent: 4682148 (1987-07-01), Ichikawa et al.
Desautels et al., "Battery Backup Failure Detection", IBM Technical Disclosure Bulletin, vol. 26, No. 6, Nov. 1983.

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