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Entry  Fri Nov 4 18:31:05 2016, Lydia, Update, CDS, c1auxex channels/pins for Acromag 
    Reply  Sat Nov 5 15:45:44 2016, rana, Update, CDS, c1auxex channels/pins for Acromag 
       Reply  Mon Nov 7 19:49:44 2016, Johannes, Update, CDS, acromag chassis hooked up to PSL acromag_chassis_location.jpgacromag_chassis_top_view.jpg
          Reply  Tue Nov 8 17:51:09 2016, Lydia, Update, CDS, acromag chassis hooked up to PSL 
             Reply  Mon Nov 21 19:54:13 2016, Johannes, Update, CDS, acromag chassis hooked up to PSL acromag_chassis.jpg
                Reply  Wed Nov 30 11:56:56 2016, Lydia, Update, CDS, Wiring for Acromag auxex replacement auxex_acromag.pdf
                   Reply  Wed Nov 30 14:54:01 2016, Johannes, Update, CDS, Slow machine replacement 
                      Reply  Wed Dec 14 19:16:57 2016, Lydia, Update, CDS, Acromag Binary I/O testing 
                         Reply  Tue Jan 31 22:15:02 2017, Johannes, Update, CDS, vme crate backplane adapter boards vme_backplane_conn_sketch.jpg
                            Reply  Tue Feb 7 19:14:59 2017, Johannes, Update, CDS, vme crate backplane adapter board layout vme_backplane.pdf
                               Reply  Wed Feb 15 00:26:44 2017, Johannes, Update, DAQ, panels and pcbs acromag_chassis_panel.pdfvme_backplane_panel.pdfrfAmp.pdf
                                  Reply  Wed Feb 15 09:06:13 2017, ericq, Update, DAQ, panels and pcbs 
                                     Reply  Wed Feb 15 22:21:12 2017, Lydia, Update, DAQ, panels and pcbs 
Message ID: 12651     Entry time: Wed Nov 30 14:54:01 2016     In reply to: 12649     Reply to this: 12677
Author: Johannes 
Type: Update 
Category: CDS 
Subject: Slow machine replacement 

I was talking with Larry yesterday, and he suggested the rack-mounted supermicro machines SYS-5017A-EP (~$400) or SYS-5018A-FTN4 (~$600) that he uses for moving data around in LIGO. They have 2 gigabit ethernet ports and can thus function as modbus gateways, conveniently placed in the rack close to the slow DAQ/DIO chassis and running some local ubuntu or other distro (I think Aidan uses CentOS in the PSL lab). These only have atom processors, which would be sufficient for the slow machine replacement, but there are many more powerful models with sometimes subtle differences. If we motion towards a more complete GigECam coverage in the lab it could be better to kill two birds with one stone and get something a little faster that can do the video capture/processing, since these machines will be distributed more or less strategically around the lab. Just a thought, as I have currently no clear idea what resources are required for this or how much we're throwing at this GigECam upgrade.



I've attached a schematic for how we will connect the Acromag mosules to the slow channel I/O curently going to c1auxex. The following changes are made:

  • We are getting rid of the slow readbacks from the Anti-Image and Oplev boards, as Rana says they are unnnecessary.
  • The whitening switching for the QPD is currently done by a Contec "fast" binary I/O module, but can be managed by acromag instead. This alllows CAB_1Y9_34 to  be fed directly into the Acromag box since all of its connections can now be managed slow. 
  • There's no need to change the PD whitening scheme around (since the signals never get huge), so we can set those to always be on and then lose those Contec channels. This means all of the necessary pins on CAB_1Y9_10 can go to Acromag. 
  • All the other backplane cables go the the fast machines only. 



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