Data Specifications

The flow of information within the ATCS is basically divided in two different classes of data, whose definition is given in [AD04], § 2.2.1. Table 2 in this chapter reminds their description and their main requisites.

Data class

Data type

Requirements

Control Information
  • Commands and replies
  • Data stored in the on-line database
  • LCU software to be down-loaded and specific rebooting commands
  • Common syntax of LCU and WS commands
  • Standard commands to test, operate and monitor the software
  • Command protocol reliability:
  • compulsory acknowledgement
  • syntax and parameters range checking
  • error reply or timeout expiration when command in failure
  • periodic replies when long lasting command under execution and explicit last reply when completed

    • Synchronization Signals
    • Time reference signals
  • Availability to all LCUs and WSs
  • Implemented using the Time Reference System [14] (10 m s accuracy in the LCUs)

    • Table 2. Data classification within the ATCS.

    All data structures produced or used by the ATCS shall comply with the specification provided in the ESO Data Interface Control Document [AD16].