1700AS0001 TCS Spec.pdf

4 Functional Requirements
4.1 Functional definition
4.1.1 Operational Concept
Doc No. SALT1700AS0001 Issue A
TCS Specification
The SALT operational concept is defined in the “SALT Operational Requirement” document listed in
section 2. The TCS will provide information to and receive instructions from the SALT Operator,
SALT Astronomer, Principal Investigator and the maintenance personnel. The TCS will also store
and distribute that data as required.
The TCS comprises a network of computers that together perform the desired functions.
Initially the SA and SO will operate the telescope from the SALT control room at the telescope but
the design shall facilitate moving this to Cape Town at a later stage.
The PI may be located anywhere in the world and has limited interaction with the TCS across the
Internet.
The maintenance staff will perform operational and maintenance tasks from various positions
inside the telescope but the design shall facilitate also doing this from Cape Town at a later stage.
Science data will be stored on a data processor from which the PI will retrieve the data via FTP
and/or CD-ROM.
4.1.2 Functional Diagrams
4.1.2.1 TIMELINE DIAGRAM
Timelines of the operation can be found in the SALT Operational Requirement.
4.1.2.2 SYSTEM STATES
4.1.2.2.1 TCS Control States
Figure 1 below defines the anticipated control states of the Telescope System and will be
controlled by the TCS Server. Each of the modes are defined in the paragraphs that follow
while the conditions for state transitions are defined in Table 1. Final modes and states will
be determined during the software design.
4.1.2.2.2 OCS States
The non TCS-server functions may have specific states but these will be determined during
the design phase and are not defined here.
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