Comparison of communication architectures for a fiber-positioning spectrograph
Entity
UAM. Departamento de Tecnología Electrónica y de las ComunicacionesPublisher
SPIEDate
2019-03-23Citation
10.1117/1.JATIS.5.1.014007
Journal of Astronomical Telescopes, Instruments, and Systems 5.1 (2019): 014007
ISSN
2329-4221DOI
10.1117/1.JATIS.5.1.014007Funded by
This work was funded by the Spanish MINECO, under Grant No. AYA2014-60641-C2 coordinated project of the EPS-UAM and IAA-CSIC research groups. The authors declare no conflicts of interests.Project
Gobierno de España. AYA2014-60641-C2Editor's Version
https://doi.org/10.1117/1.JATIS.5.1.014007Subjects
astronomical instrumentation; spectrograph; telescopes; communication; fiber positioning system; TelecomunicacionesNote
Copyright 2009 Society of Photo‑Optical Instrumentation Engineers (SPIE). One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this publication for a fee or for commercial purposes, and modification of the contents of the publication are prohibited.Rights
© 2019 SPIEAbstract
The communication architecture required to provide a bidirectional communication between a central
command node and a full set of fiber positioners feeding a spectrograph is studied. Six different architectures have
been analyzed in terms of communication time and power consumption. These architectures are the result of the
combination of three different communication protocols: transmission control protocol/internet protocol (TCP/IP)
over ethernet, interintegrated circuit (I2C), and controller area network. The design of communication architecture
must prioritize between communication time and power consumption. The fastest architecture is the hybrid TCP/IP
over ethernet-I2C. This architecture requires the least time to provide a full set of coordinates to every fiber
positioner less than 50 ms. The most power efficient solution is the I2C—I2C with demultiplexers. This architecture
solves a bidirectional communication between a central node and a full set of fiber positioners requiring only an
addition of 27 mW.
Files in this item
Google Scholar:Martínez García, María Sofía
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López Colino, Fernando Jesús
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Garrido Salas, Javier
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González de Rivera Peces, Guillermo José
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Sánchez, Justo
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Prada, Francisco
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