Time-of-day coincidence system

Details Time-of-day coincidence system Time-of-day coincidence system

1987-09-03

1989-02-07

Heyman, John S.

Electrical pulse counters, pulse dividers, or shift registers: c

Systems

Identifying or correcting improper counter operation

371 61, 364200, G06F 1100

Patent

active

048037087

ABSTRACT:
A time of day coincidence system for coinciding time of day values of a plurality of apparatuses includes a clock pulse generator for generating clock pulses having a predetermined interval, a TOD time of day timer controlled by the clock pulse, a time of day correction signal generator for generating a correction signal in a predetermined interval which is a predetermined multiple of the count cycle of the TOD timer. The clock pulse generator, the TOD timer, and the time of day correction signal generator are arranged commonly for the apparatuses. The system also includes a counter, a count of which is incremented in response to the clock pulse, a time of day read and set unit for reading out current time of day information from the TOD timer in response to an external instruction and setting the time of day information in the counter, and a time of day correction unit for correcting the count of the counter in response to the correction signal in accordance with a predetermined rule. The counter, the time of day read and set unit, and the time of day correction unit are arranged in each of the apparatuses.

REFERENCES:
patent: 4490821 (1984-12-01), Lacher
patent: 4566111 (1986-01-01), Tanagawa
patent: 4575848 (1986-03-01), Moore et al.
patent: 4586180 (1986-04-01), Anders et al.

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