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Subject: Re: Recommendations for EPICS Based Data Acquisition System
From: Mark Rivers <rivers@cars.uchicago.edu>
To: Matt Rippa <mrippa@gemini.edu>, Talk EPICS Tech <tech-talk@aps.anl.gov>
Cc: Rolando Rogers <rrogers@gemini.edu>
Date: Thu, 7 Dec 2017 14:17:12 +0000
Hi Matt,


Can you describe a bit more the specifications and how it operates?


- How many inputs at 5 kHz?

- How much calculation to determine the outputs?

- How many outputs to be written, and at what rate?

- Is this just for feedback control, or do you need to log the inputs and if so at what rate?


Mark



________________________________
From: tech-talk-bounces@aps.anl.gov <tech-talk-bounces@aps.anl.gov> on behalf of Matt Rippa <mrippa@gemini.edu>
Sent: Wednesday, December 6, 2017 2:54 PM
To: Talk EPICS Tech
Cc: Rolando Rogers
Subject: Recommendations for EPICS Based Data Acquisition System

Aloha,

I'm looking for your recommendations on the latest data acquisition
hardware, compatible with EPICS.

Our Secondary Mirror system at Gemini has a 1 meter diameter,
55 kg mass. There's 3 degrees of freedom and a 5 kHz control loop.
The system was designed in the 90's by Lockheed Martin, based on
a DOS PC with an ISA backplane (PICMG 1.0) and a DSP data
acquisition board with 16 bit ADC's and DAC's. The DOS PC interfaces
with an EPICS IOC via Reflected Memory.

In 2010 I did a conceptual redesign based on a Hytec Blade 9010 using
IP cards and an Intel CPU running RTEMS. Today it seems FPGA's are
a popular choice for data acquisition. Perhaps a Xylinx zynq solution?
Would anyone still consider VME?

I have no requirement for 5 kHz EPICS control.  Although that's intriguing.

Thanks for your time.

-Matt

Replies:
Re: Recommendations for EPICS Based Data Acquisition System Matt Rippa
References:
Recommendations for EPICS Based Data Acquisition System Matt Rippa

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