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Proceedings Paper

New control software of the 188cm telescope of Okayama Astrophysical Observatory
Author(s): Michitoshi Yoshida; Yasuhiro Shimizu; Etsuji Watanabe; Kenshi Yanagisawa; Fumihiro Uraguchi
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Paper Abstract

We developed the telescope control software for the 188cm telescope of Okayama Astrophysical Observatory (OAO) based on Java technology. Basically, the software consists of two processes running on separate Java virtual machines; one of which is the “Command Dispatcher (CD)” and the other is the “User Interface (UI)”. Among the two, CD is the main engine/server of the telescope control, whereas UI is just a client. The “standard” UI we provide is a graphical user interface written in Java/Swing. CD communicates with the local control units (LCUs) of the telescope through RS232C. CD is a Java multi-thread program, in which a number of threads run simultaneously. The threads running in CD are the follows: UNIX socket servers for external communications, socket opener for on-demand open/close of a socket port, socket client manager, auto-guider and dome watcher, internal command dispatcher, status manager, status collector, RS232C writer and reader, logger, and control units. The above “control units” are software models (“objects”) of the telescope system. We introduced four control units- “Telescope”, “Dome”, “Weather-Monitor”, and “Pointing”- for telescope control. The first three units are simple software models of the real-worlds devices. The last one, “Pointing”, is a unit which abstracts pointing procedure of the telescope. CD and UI communicate with each other using UNIX socket. The command protocol of this communication is fairly simple, and observation instruments, auto guider, or additional UI for remote observation are also able to communicate with CD through socket using this protocol. CD opens and closes socket ports for communication on demand according to the request of client process (UI, instruments etc.), so that any clients can be connected to CD dynamically.

Paper Details

Date Published: 13 December 2002
PDF: 9 pages
Proc. SPIE 4848, Advanced Telescope and Instrumentation Control Software II, (13 December 2002); doi: 10.1117/12.461308
Show Author Affiliations
Michitoshi Yoshida, National Astronomical Observatory of Japan (Japan)
Yasuhiro Shimizu, National Astronomical Observatory of Japan (Japan)
Etsuji Watanabe, National Astronomical Observatory of Japan (Japan)
Kenshi Yanagisawa, National Astronomical Observatory of Japan (Japan)
Fumihiro Uraguchi, National Astronomical Observatory of Japan (United States)


Published in SPIE Proceedings Vol. 4848:
Advanced Telescope and Instrumentation Control Software II
Hilton Lewis, Editor(s)

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