[chub, gautam]

With Chub's help, most of the problems have been resolved. Summary: I judge that we are good to go ahead with an install tomorrow.

1. The problem with the BIO channels was a mis-wiring internal to the chassis - Chub fixed this and now all 32 AA enable/disable switches seem to work as advertised. Of course we will need to do the in-situ test to make sure.
2. The problem with the ADC channels were multiple:
   • On the software end, I had gotten some addressing wrong - this was fixed.
   • On the hardware side - even though the inputs of the Acromag are "differential", I found that the readback was extremely noisy (~0.5 V RMS for a 3 V DC signal from the handheld calibrator unit 😲 ). Looking through the manual, I found a recommendation (pg10) that the "IN-" terminal of the Acromag ADC units be tied to the "RTN" pins on the same units. I don't know if this preserves the differential receiving capability of the Acromag ADCs - anyways, after Chub implemented this change, all the Analog Input channels behave as expected (I tested with a DC voltage and also a 200 mHz sine wave from a function generator).
   • Note that most of the Eurocard electronics we use are single-ended sending anyways.
   • What does this mean for the other Acromag ADCs (e.g. OSEM Shadow Sensor monitors) we have installed????? I saw no documentation in the elog/wiki.
3. Binary input channel:
   • This is used by the "CM LIMIT" channel.
   • I found that I had to initialize a separate alias for the BIO3 unit, which acquires this signal, to use the modbus function "4" corresponding to "Read Input Registers" - c.f. the binary output modbus function 6, which is to "Write Single Register".
   • The fix for the mbbo channels is also likely to be along this lines - but I don't have the energy for that endavor right now.
4. Testing of the physical mbboDirect bit channels using the Acromag Window utility
   • I can't get the mbboDirect EPICS record to work as expected, so I decided to use the native Acromag utility to test the functionality
   • First I released control of the acromags from the supermicro (stopped modbus)
   • There were several wiring errors - Chub had left for the day so I just fixed it myself.
   • The LED tester kit was used to check that the correct bits were flipped - they were.
5. At the time of writing, the non-functional channels (in EPICS) are all related to the CM board:
   • C1:LSC-CM_LIMIT (binary input) tested later in the day, works okay...
   • C1:LSC-CM_REFL1_BITS (mbboDirect)
   • C1:LSC-CM_REFL2_BITS (mbboDirect)
   • C1:LSC-CM_AO_BITS (mbboDirect)
   • C1:LSC-CM_BOOST2_BITS (mbboDirect)

Since we don't immediately need the CM board, I say we push ahead with the install - at least that will restore the ability to lock PRMI / DRMI. Then we can debug these issues in situ - I'm certain the issue is related to the EPICS/Modbus setup and not the hardware because I verified the physical channel map using the Acromag windows utility.

Remaining Tasks:

1. Install power supply cables at 1Y3
2. Install supermicro and Acromag crates in 1Y3
3. Migrate existing P1 connectors to P2 where applicable (Whitening boards)
4. Connect Dsub-->P1 / P2 adaptors
5. Run in-situ tests