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4 APT Masterswitch implementation
4.1 Introduction
Currently the Masterswitch is controlled via an “Expect” script which runs a telnet session to
interface to the device. Expect is a scripting language designed to respond to text on the
screen.
The JAS interfaces to the Masterswitch using the APTSystem framework. Each time a
Masterswitch outlet property is set, the APTSystem calls the aptSetProperties script which in-
turn invokes the expect script. Eventually resulting in the outlet changing state. I.e. Switch on or
off.
There are several issues with the current implementation:
• There is no state change notification
The Masterswitch device must be queried at regular intervals in order to discover when
an outlets state has changed, possibly due to another user controlling the device.
• Unreliable, occasionally the TELNET session created within the expect script fails for
unknown reasons.
• Poor Error handling. If the script fails, very little error information can be obtained.
The SNMP (Simple Network Management Protocol) interface provides a much more powerful
way to control the hardware. When the SNMP interface is enabled, the Masterswitch generates
SNMP Traps which can be used to notify the system of any state changes within the system.
Capturing this information at runtime allows notification of state changes within the system rather
than using a polling technique.
It is desirable for the APT System to be able to access the Masterswitch as a Java Object. This will
allow more powerful JASCommands to be written, which will, in turn provide a framework for a
more reliable and flexible software module.
4.2 Controlling the masterswitch
Due to the simple functionality of the Masterswitch, the requirements for controlling it are fairly
straightforward. These are:
• get and set outlet state
• Real-time notification of outlet state changes
It is vital that the system always reflects the current state of the Masterswitch. Although
the outlets are unlikely to be switched often, correctly knowing the state of each outlet at
all times would be valuable information, particularly if a fault had occurred elsewhere in
the system.
• Error Notification
Internal errors and warning conditions within the Masterswitch should be able to be
monitored
• Support for adding multiple Masterswitch devices in the future.
- Oliver Mather 1
- Abstract 3
- Acknowledgements 5
- Contents 7
- List of Figures 9
- 1 Introduction 11
- 2 APT hardware 13
- 2.3 Mistral 14
- 2.4 Telescope 14
- 2.5 CCD 16
- 2.6 Telescope movement 16
- 2.6.1 Anti backlash motor 17
- 2.6.2 Limit switches 18
- 2.6.3 Tilt sensor 19
- 2.6.4 Macrostation 19
- 2.7 Masterswitch 20
- 2.8 Web cameras 21
- 2.10 Roof 22
- 2.11 ROTSE 23
- ParralelRS232RS232 24
- 3 APT software 25
- 3.3 Command line tools 26
- 3.4.1 Introduction 27
- 3.4.2 Architecture 27
- 3.5 APT server 28
- 4.1 Introduction 31
- 4.3 Code 32
- 4.3.2 Configuration 33
- 4.3.3 SNMP messages 33
- 4.4 JAS integration 34
- 4.4.1 Commands 35
- 4.4.2 Messages 36
- 4.5 Screenshots 37
- 4.6 Conclusion 38
- 5.1 Introduction 39
- 5.2 Architecture 40
- 5.3 Process manager 40
- 5.4 Roof 41
- 5.5 Chat system 43
- Figure 5-8 APT chat system 44
- 5.6 Look and Feel 45
- 5.6.2 Problems 46
- 5.6.3 Screenshots 46
- 5.7 Conclusion 47
- 6 APT software deployment 49
- 6.3.1 Versioning 50
- 6.3.2 Security 51
- 6.4 Compilation 52
- 6.5 Version synchronisation 55
- 6.6 Uploading 56
- 6.7 Conclusion 57
- 7.1 Introduction 59
- 7.2 Hardware 59
- 7.3 Software 59
- 7.3.2 Maintenance 60
- 7.3.3 Client SP server 60
- 7.3.4 Client error control 60
- 7.4 Conclusion 62
- 8 SkinnedTextField 63
- 8.4 TextSkin 64
- 8.5 SkinnedTextFieldDemo 65
- 9 CSIRO SEARFE project 69
- 9.3 Requirements 70
- 9.4 Hardware 71
- 9.5 Architecture 71
- 9.5.1 Data files 72
- 9.6 User interface 73
- 9.6.2 Data visualisation 76
- 9.7.1 Visualisations 80
- 9.8 Conclusion 81
- 10 Conclusion 83
- 10.4 Logging analysis 84
- Bibliography 87
- A. Glossary 89
- B.1. Introduction 91
- B.2. JAS message sender 91
- B.4. Creating JAS commands 91
- B.4.1. JASCommand object 92
- B.4.2. Installing commands 92
- B.5. JAS channel monitoring 93
- C. Software tools 95
- C.1.3. Checkout the code 96
- C.1.4. CVS user interfaces 96
- D. SNMP overview 97
- Response 98
- RequestRequest 98
- E. Astronomy primer 99
- E.1.3. Coordinate epochs 100
- E.2. Astronomical times 101
- E.3. Gamma ray bursts 102
- E.4. Astronomical filters 102
- E.5. Flat fielding 103
- E.6. Cosmic rays 103
- F. Selected code listings 105
- F.1.6. SnmpTrapDaemon.java 121
- F.2. APT deployment system 132
- F.2.3. apt build.xml 134
- F.2.4. lib build.xml 141
- F.3. CSIRO / SEARFE 144
- F.4. TextSkin 145
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