1 INTRODUCTION

1.1 PURPOSE

This document is the User Manual for the HOS/Sequencer version 2.69 and is intended to provide all the necessary information for the installation and use of this module.

1.2 SCOPE

The Sequencer-module in its present release (2.69) is limited to an embeddable interpreter with low level commands. The use of this interpreter and its shells (seqWish and seqSh) will typically be in workstation applications offering higher level functionality, including a user interface and acces to the CCS functionality.

The user-interface to create and execute Sequencer-scripts is named sequencer. It is currently not included. It will create scripts that can be interpreted by seqWish and seqSh, and will itself be a set of Sequencer-scripts.

1.3 REFERENCE DOCUMENTS

The following documents are referenced in this document.

[1] Tcl and the Tk toolkit, John K. Ousterhout, ISBN 0-201-6337-X

[2] Practical Programming in Tcl and Tk, Brent Welch, ISBN 0-13-182007-9

[3] VLT-MAN-ESO-17200-0981, 1.0 15/01/96 -- VLT SW Problem Report Change Request User Mnl

[4] VLT-MAN-ESO-17229-0866, 2.8, 16/05/1999 -- VLT SW Real Time Display User Manual

1.4 ABBREVIATIONS AND ACRONYMS

The following abbreviations and acronyms are used in this document::

CCS Central Control Software

HOS High Level Operating Software

HW Hardware

I/O Input/Output

SW Software

TBD To Be Defined

VLT Very Large Telescope

WS Workstation

1.5 GLOSSARY

sequence
a set of commands in Sequencer language, generally intended to define and execute a series of related observations. These sequences are to be interpreted by a sequencer shell.

Tcl/Tk
Tool command language / Toolkit. A general purpose scripting language designed and implemented by Dr. John Ousterhout of the University of Berkeley, CA (presently working at Sun Microsystems Laboratories).

1.6 STYLISTIC CONVENTIONS

The following styles are used:

bold
in the text, for commands, filenames, pre/suffixes as they have to be typed.

italic
in the text, for parts that have to be substituted with the real content before typing.

teletype
for examples.

<name>
in the examples, for parts that have to be substituted with the real content before typing.

bold and italic are also used to highlight words.

1.7 PROBLEM REPORTING / CHANGE REQUEST

Please refer to [3]:

1. to report a problem encountered using the software and/or documentation

2. to suggest changes in the software or documentation

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