Remote meter reading method and apparatus

Details Remote meter reading method and apparatus Remote meter reading method and apparatus

1989-04-04

1991-04-23

Ng, Jin F.

Telephonic communications

Telephone line or system combined with diverse electrical...

To produce visual-graphic copy

379106, H04M 1100

Patent

active

050105680

ABSTRACT:
A remote meter reading system has equipment at a telephone company office coupled by modems to a utility company computer which issues requests for customer data. Telephone test trunks are used to access individual meter sites and initiate meter readings using a number of single frequency bursts. Meter sending units emit a pulse for each unit of consumption and a microprocessor counts the pulses in RAM to derive separate meter readings. When interrogated, the microprocessor outputs the readings in a binary coded decimal format to a DTMF tone generator which emits each decimal number as a tone pair which is transmitted via the telephone line and is detected at the telephone company, translated into ASCII code and transmitted by modem to the utility computer.

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patent: 4833618 (1989-05-01), Verma et al.
patent: 4847899 (1989-07-01), Hikida

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