System of identifying local stations by a central interrogating

Details System of identifying local stations by a central interrogating System of identifying local stations by a central interrogating

1983-12-02

1986-10-07

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

34082564, 34087024, 34082507, 34082536, H04Q 914, G08B 1100

Patent

active

046162232

ABSTRACT:
A station identification system comprising a central interrogating station (10) and M local stations (100, 200), etc. arranged in parallel with each other along a transmission bus (20) which connects them to said central station. Each local station is adapted to receive the interrogation signal supplied by the output stage of the central station (10) and to return a specific answer signal to this station. The answer signal represents the state of one or a plurality of detection circuits in said station. Each local station comprises a sequential loading circuit for the temporary storage of a digital identification word specific to each station, an encoder wheel (122) whose N outputs enable said N-bit identification word to be defined, 2.sup.N being greater than or equal to the number M of stations, a discriminator circuit for the validation of said word, a comparator circuit for the comparison of said temporarily stored digital word with a digital reference word, and a circuit for returning the specific information to the central station when the words thus compared are identical.

REFERENCES:
patent: 4435706 (1984-03-01), Callan
patent: 4535401 (1985-08-01), Penn

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