MuSR: 3He Refrigerator Communications

[JamesKingWork]

As a MuSR scientist, I would like the 3He Refrigerator IOC to be able to send commands to set and get values on the 3He Refrigerator IOC.

Acceptance criteria:

• [x] The VI uses an ISOBUS (a type of serial) comms protocol. Check that this is still the plan and document the setup.
• [x] Create EPICS protocol and db records to implement the communications protocol. The protocol can be found in various VIs e.g. Muon HlxSetSorbFlow2.vi
• [x] Document the communications protocol
• [x] Test the communications sufficiently with the IOCTestFramework

Notes:

• The communications protocol is based on the Heliox/ITC503 protocol but is to be implemented in its own IOC
• The 3He refrigerator is a Heliox/ITC503 based system
• LabVIEW VIs are at C:\LabVIEW Modules\Oxford Software\Muon Heliox and in the Muon HxSubVis subfolder.

3He Refrigerator tickets:

• Document VI control logic: https://github.com/ISISComputingGroup/IBEX/issues/6239
• Implement control logic: https://github.com/ISISComputingGroup/IBEX/issues/6240
• Communications: https://github.com/ISISComputingGroup/IBEX/issues/6241
• OPI: https://github.com/ISISComputingGroup/IBEX/issues/6244
• Machine setup: https://github.com/ISISComputingGroup/IBEX/issues/6242
• Testing on Device: https://github.com/ISISComputingGroup/IBEX/issues/6243

[JamesKingWork]

PRs:

• https://github.com/ISISComputingGroup/IBEX/pull/6246
• https://github.com/ISISComputingGroup/EPICS-ioc/pull/589
• https://github.com/ISISComputingGroup/EPICS/pull/249
• https://github.com/ISISComputingGroup/EPICS-hlx503 (code is already on main as this is a new submodule. Originally this contained a new proto and db file, but now we are using the itc503 submodules proto and db. I believe this support module should be kept as we will need one for the cryogenic logic and having a placeholder already created will save time.)
• https://github.com/ISISComputingGroup/EPICS-IOC_Test_Framework/pull/417
• ~https://github.com/ISISComputingGroup/EPICS-DeviceEmulator/pull/104~ (Using 4 itc503 emulators now)
• https://github.com/ISISComputingGroup/EPICS-Itc503/pull/5

Docs:

• https://github.com/ISISComputingGroup/ibex_developers_manual/wiki/ITC503-Heliox

[JamesKingWork]

Confirmed with cryogenics and MuSR scientists that this is purely ITC503 and doesn't use ITC502s and ITC601s as the LabVIEW suggests

[JamesKingWork]

Confirmed with cryogenics and MuSR scientists that the ITC503 is not on ISOBUS but is an RS232 connection going direct into a moxa.