Remote monitoring and controlling system

Details Remote monitoring and controlling system Remote monitoring and controlling system

1987-10-14

1989-08-22

Weldon, Ulysses

Communications: electrical

Continuously variable indicating

With meter reading

34082506, 34082507, H04Q 100

Patent

active

048600016

ABSTRACT:
A remote monitoring and controlling system in which time information from a secondary clock in each slave station is transmitted in coded signal form to a master station in response to a time inquiry command issued from the master station. The transmitted time information and the time information of the primary clock of the master station are compared in the master station by taking into account the length of the coded signal and a transmission delay time from the corresponding slave station. The difference found by the comparison is temporarily stored in memory as time correction data to be used to correct the time information of the respective slave stations.

REFERENCES:
patent: 3798650 (1974-03-01), McComas et al.
patent: 3801981 (1974-04-01), Alpers
patent: 3889461 (1975-06-01), Marti et al.
patent: 4149144 (1979-04-01), Diefenerfer
"Definition, Specification, and Analysis . . . Control and Data Acquisition", American National Standard, 1979, p. 13.

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