Dial inbound meter interface unit (MIU) for automatic meter read

Details Dial inbound meter interface unit (MIU) for automatic meter read Dial inbound meter interface unit (MIU) for automatic meter read

1991-01-22

1992-07-28

Dwyer, James L.

Telephonic communications

Telephone line or system combined with diverse electrical...

To produce visual-graphic copy

379104, H04M 1100

Patent

active

051346508

ABSTRACT:
The present invention is a method by which a dial inbound MIU is able to provide for connection with a central station computer without the need for any specialized telephone equipment at the telephone company's central office. If the customer's phone has been called, the invention detects whether the customer has answered. It then waits until the customer hangs up, and when the customer hangs up it siezes the line and waits for a modem tone indicative of the presence of the central station computer waiting to establish communication. If that modem tone is present, the MIU will connect to the central computer and permit communication to take place before releasing the phone line.

REFERENCES:
patent: 4660218 (1987-04-01), Hashimoto
patent: 4720851 (1988-01-01), Smith
patent: 4949372 (1990-08-01), Steele

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