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“…the encoder intended to be used is:
-             Read head: T2601-15M or T1611-15M (this depends on availability, the arc can be resolved with a linear and a rotary encoder head, it is actually more a matter of how the scale is mounted and that will be done on an arc)
-             Interface: Ti20KDA06A, that is 20,000x interpolation to get the highest resolution. Note, on the interface one has to check with controls what options they may want to see, for that see below link. What is of importance are the last for letters (i.e. currently the …A06A, this is our usual default):
o            First A: this is for alarm outputs. I have to admit, I have no real clue on that, this needs to come from controls
o            06 is the max output frequency. 6 MHz in this case, often controllers have a limit of what they can take as maximum. The 6MHz is for vibrations check more than sufficient
o            Second A: some options regarding what kind of signals are output, also here this is a controls related question.https://www.renishaw.com/media/pdf/en/257d836362cd4e8189908521185ff4bd.pdf”

Second High-Rate Encoder Meeting (Nov. 28, 2022)

• Axilon will install in FEE in December
• Georgi wants it in DAQ by end of 2023
• Quadrature output, oversample counter at 186MHz, sample that at 1MHz
• front-end board (not a computer) KCU105 receiving (like wave8)
• need to order now (16-week lead time)
• should ask hard x-ray hutches if they want any of these
• does TID need a test encoder?  they think it's ok to use an oscilloscope to capture a few ticks of the encoder (May Ling wants to do this anyhow to test connections)
• this encoder will be in the FEE, so not always accessible
• will absolute encoder plus interpolation be as good as the high rate relative encoder?  answer: we will have to look at the photon "energy resolution".

Encoder Simulator

Chris Ford has an encoder simulator in lab3, with documentation here:  UDP Encoder Interface (rix Mono Encoder).  He also has committed lab3-caf-encoder.cnf to lcls2 GitHub in psdaq/psdaq/cnf/

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