Digital command system
Abstract
The correct processing of the Digital Command System (DCS), which provides a limited real-time means of controlling specific flight program functions, was verified. The ability of the flight program to correctly read and process DCS commands was verified. Tests made by the flight program after reading the contents of the command decoder register to establish the validity of the received data were verified through the following: DCS mode command verification, DCS data command verification, DCS data validation, and DCS error message. The operation of the following DCS commands accepted and processed by the flight program was tested: time base update, navigation update, generalized switch selector, memory dump, terminate, execute generalized maneuver, return to nominal timeline, ECS water control valve logic inhibit, execute maneuver, execute alternate sequence, targeting load, ladder magnitude limit, S-IVB/IU de-orbit, compressed data dump, and remove inhibit on the extraction maneuver.
- Publication:
-
In its Program Verification Doc. for the ASTP Flight Program 9 p (SEE N75-33114 24-12
- Pub Date:
- April 1975
- Bibcode:
- 1975pvfp.nasaU.....
- Keywords:
-
- Automatic Control;
- Digital Command Systems;
- Acceptability;
- Real Time Operation;
- Space Communications, Spacecraft Communications, Command and Tracking