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AAT ICAS 2230 ✧ IDC interface timesetting specifications

document note: this document is part of the Integrated Chronological Applications System (ICAS). Alliance for the Advancement of Technology (AAT) provides ICAS standards documents subject to terms of use described in document AAT ICAS 9010. please refer to other key AAT ICAS standards documents accessible via the AAT ICAS web site at for important information about ICAS.

IDC interface timesetting specifications

this document describes AAT ICAS specifications for IDC interface timesetting that may be used for a functional implementation of ICAS methods or applications. developers and users should consider the use of appropriate documentation of timesetting methods or applications for strict implementations of ICAS timesetting methods or applications. timesetting methods and applications should moreover be designed for convenient or easy timesetting in support of usable design.

ICAS timesetting may be coordinated with a designated official timekeeping system such as a UT timeserver. ICAS timesetting may be coordinated with a designated local timekeeping system such as a broadcast or a desktop computer. ICAS timesetting may also be coordinated with an independent timekeeping instrument such as a clock.

ICAS timesetting may also be user-set provided that a coherent method for timesetting is established. for example, digital IDC interfaces should be designed to provide users with an easy scrolling range of 0 to 9 for each user-selectable decimal place (rather than a longer scrolling range for more than one decimal place at one time). user should thus have capability to set various decimal place units independent of other decimal place units.

ICAS timesetting for analog interfaces imposes some additional conditions. the various particular clock units for an IDC analog interface may phase incrementally or continuously. ICAS major, minor, and subminor clock units may be set dependently and/or independently of each other as may be practical; however any timeset method must accommodate conformance to a coherent ICAS relation among the major, minor, and subminor clock units.

a condition of clock unit coherence determines that by some method, the particular clock units must possess a capability to coherently synchronize with other clock units. if a subminor clock unit is to be set independent of the major and minor clock units, then a user might first set the subminor clock unit phase before setting the major and/or minor clock unit phases. moreover, if a user timeset of a clock unit phase results in an asynchronous relation, then the instrument should provide capability to correct the phasing of clock units to ICAS conformance.

top document updated:

system identifiersdatetime
Uniform CalendarUCUCN 12019 S19 Yellow
Inter-Dial ClockIDCzone(UT)t339 tt050
'ICAS in use' can accommodate calendar and clock formatting 'for all people, for all time'.
day of yearD-o-YAD common year day139
Gregorian calendarGG2019 May 19 Sunday
seconds, minutes, hoursSMHUT08:08:14
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