FA125 Data Format Aug 11, 2015

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Location and Time

Room: CC F326

Time: 3pm.

Remote Connection

You can connect using BlueJeans using the meeting number 589 693 655 .       (Click "Expand" to the right for more details -->):

(if problems, call phone in conference room: 757-269-6460 might not be the correct number)

  1. To join via Polycom room system go to the IP Address: (bjn.vc) and enter the meeting ID: 589693655.
  2. To join via a Web Browser, go to the page [1] https://bluejeans.com/589693655.
  3. To join via phone, use one of the following numbers and the Conference ID: 589693655
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Specific instructions for connecting via polycom:

  • Turn polycom on if necessary
  • With the polycom, place a call at
  • Press # to enable the polycom keypad, then enter the meeting id: 589693655 and #
  • You may have to unmute the microphone: #*4
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  • Previous meeting (July 7, 2015)
  • FADC125 Firmware status
  • Driver library status
  • Mode names: CDC long/FDC short with amplitude, etc (See list)
  • Catch up on format spec since last meeting
    • Field range for configuration parameters unchanged (See table in June minutes)
    • Latest version of format spec includes diagrams
    • Added NE
    • Question on NPK>1 output in combo mode
  • Format spec still-to-do
    • Add table of time error codes
  • Testing plans
  • Next meeting

Useful Info


Present: Naomi, Mike (CMU), David, Bryan, Cody, Lubomir, Beni (JLab)

  • FADC125 Firmware status - Cody has the short and long CDC modes working; with Beni he ran some tests to make sure that the output was as expected. The short mode ran at 120 kHZ with a random trigger. Next they will try the long mode, and different configuration parameters.
  • Driver library status - Bryan reported that the driver is ready, and available on his git repository as branch release-2.0.1. This includes redefined arguments for fa125procmode and incorporates the new parameter names and functions for setting and retrieving timing thresholds and scaling factors, etc.
  • Mode names: We decided to stick with the names CDC long/FDC short with amplitude, etc (See list) but will have to renumber some of the data types to maintain consistency between the new and old data. David emailed that data type numbers 5,6,9,11 and 12 are available as these have not been used for the FA125 (some were defined but not used).
  • Catch up on format spec since last meeting
    • The field range for configuration parameters was unchanged.(See table in June minutes)
    • The latest version of format spec includes diagrams
    • The configurable parameter NE is required in place of the hard-coded 6 to prevent the subset of samples required by the timing algorithm from extending past the end of the data window. 6 was sufficient for the number of samples NU=15 and threshold crossing sample X=9, but making NU configurable requires a configurable parameter (NE) in place of '6'.
    • NPK>1 output should be removed from the CDC combo mode as we will not use it
    • An extra word containing NW and number of peaks found is needed for the long (combo) modes. It was suggested either to add that word as the second word in the data format (before the peak data and before the raw samples), or to use the 250 data format for raw samples.
  • Next meeting - to be decided, either Aug 25 at 2.30 or the following week at 1.30.

Postscript: Next meeting will be Tuesday Aug 25 at 2pm