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Entry  Wed Sep 18 12:40:09 2019, gautam, Update, CDS, Fast BIO Mapping at 1Y2 
    Reply  Thu Sep 19 21:23:51 2019, gautam, Update, CDS, Fast BIO splicing re-implemented at 1Y2 1Y2_FAST_BIO_WIRING_MAP.pdfIMG_7949.JPGREFL165.pdf
Message ID: 14895     Entry time: Wed Sep 18 12:40:09 2019     Reply to this: 14901
Author: gautam 
Type: Update 
Category: CDS 
Subject: Fast BIO Mapping at 1Y2 

INCORRECT INFO IN THIS ELOG HAS BEEN REMOVED. SEE THIS ELOG FOR THE UPDATED INFO.

Summary:

With the help of a tester board, I verified the mapping between fast BIO DB37 pins, and pins on the IDC50 connectors that are to be broken out to the whitening boards. I will enlist Chub to implement this mapping in hardware later today.

Details:

  1. The LSC PD demodulated signals are optionally whitened before acquisition by our RTCDS ADCs.
  2. The switching of each channel's whitening (enable/disable) is done by a single bit from the fast (a.k.a. RTCDS) system's BIO cards.
  3. The whitening boards live inside Eurocrates.
  4. The aforementioned switching signal needs to be sent to the whitening boards via the backplane of the Eurocrate.
  5. This requires some cross-connect based cable splicing between the BIO card outputs and the P2 connectors of the whitening boards in the Eurocrates.
  6. This connection was accidentally destroyed during the war on cross-connects at 1Y2. I couldn't find a wiring diagram anywhere.
  7. Today, with the help of a tester board, I verified the mapping by toggling the appropriate channels on the MEDM screen, and verifying the correct LEDs on the tester board were toggled.
  8. Map will be posted here after the meeting... Also now on the wiki.

Update 2019 Sep 19 1730: The pin numbers of the IDC 50 connector are all off by 1. i.e. 3-->4 and so on. I will fix this shortly. The problem was because of me looking at the pinout for the wrong gender of IDC50 connectors.

ELOG V3.1.3-