Comparison of communication architectures for a fiber-positioning spectrograph

Sofia Martínez-García; Fernando Lopez-Colino; Javier Garrido; Guillermo Glez-de-Rivera; Justo Sanchez; Francisco Prada

doi:10.1117/1.JATIS.5.1.014007

23 March 2019 Comparison of communication architectures for a fiber-positioning spectrograph

Sofia Martínez-García, Fernando Lopez-Colino, Javier Garrido, Guillermo Glez-de-Rivera, Justo Sanchez, Francisco Prada

Journal of Astronomical Telescopes, Instruments, and Systems, Vol. 5, Issue 1, 014007 (March 2019). https://doi.org/10.1117/1.JATIS.5.1.014007

Abstract

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.

Citation Download Citation

Sofia Martínez-García, Fernando Lopez-Colino, Javier Garrido, Guillermo Glez-de-Rivera, Justo Sanchez, and Francisco Prada "Comparison of communication architectures for a fiber-positioning spectrograph," Journal of Astronomical Telescopes, Instruments, and Systems 5(1), 014007 (23 March 2019). https://doi.org/10.1117/1.JATIS.5.1.014007

Received: 31 October 2018; Accepted: 7 March 2019; Published: 23 March 2019

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