Add link to chopper comms protocol

Author: FreddieAkeroyd

doc/processes/instrument_details/MARI-Instrument-Details.md

@@ -39,7 +39,7 @@ MARI has two ISIS MK3 disk choppers.  User needs the ability to change speed & p
 Ideally, the two choppers should seen as a single pair by visiting scientists; instrument scientists need the ability to control the two choppers independently (e.g. for diagnostic purposes).
 
 ##### Note: MARI Fermi Chopper #####
-The fermi chopper is a Jülich model (FZJ - Forschungszentrum Jülich) - custom built for ISIS (therefore unique, although very similar to models installed on MAPS and MERLIN).  A copy of the communications manual (PDF) is [here](https://stfc365.sharepoint.com/sites/ISISExperimentControls/ICP%20Discussions/Forms/AllItems.aspx?id=%2Fsites%2FISISExperimentControls%2FICP%20Discussions%2FMERLIN) and the operating manual [here](https://stfc365.sharepoint.com/sites/ISISExperimentControls/ICP%20Discussions/Forms/AllItems.aspx?id=%2Fsites%2FISISExperimentControls%2FICP%20Discussions%2FMERLIN).<br>
+The fermi chopper is a Jülich model (FZJ - Forschungszentrum Jülich) - custom built for ISIS (therefore unique, although very similar to models installed on MAPS and MERLIN).  A copy of the communications manual (PDF) is [here](https://stfc365.sharepoint.com/:b:/r/sites/ISISExperimentControls/ICP%20Discussions/MAPS/Fermi%20Chopper%20Communications%20Protocol.pdf?csf=1&web=1&e=DXEcym) and the operating manual [here](https://stfc365.sharepoint.com/sites/ISISExperimentControls/ICP%20Discussions/Forms/AllItems.aspx?id=%2Fsites%2FISISExperimentControls%2FICP%20Discussions%2FMERLIN).<br>
 The control program will need to include various safety-critical condition monitoring routines (e.g. overspeed, bearing voltage out-of-range).  There are some aspects of the control system which are specific to MARI and will need to be incorporated into the IOC.  Ideally, they would be modular (e.g. macro, configuration file) so that the main program would be compatible between the three systems (MERLIN, MAPS, MARI).<br>
 David Keymer wrote the original VIs, which are a useful reference.<br>
 The Fermi chopper on MARI is primarily controlled via scripts.  Scripts are used to calculate the frequency & phase, based on the energy (longer-term this calculation could be folded into IOC).  The OPI should merely display the frequency & phase, not allow the user to change them. <br>

doc/processes/instrument_details/MERLIN-Instrument-Details.md

@@ -50,7 +50,7 @@ We believe this "button" is the local vs computer-control switch.  If set to loc
 
 {#merlin_noteFermiChopper}
 ##### Note: MERLIN Fermi Chopper #####
-The fermi chopper is a Jülich model (FZJ - Forschungszentrum Jülich) - custom built for ISIS (therefore unique, although very similar to models installed on MAPS and MARI).  A copy of the communications manual (PDF) is [here](https://stfc365.sharepoint.com/sites/ISISExperimentControls/ICP%20Discussions/Forms/AllItems.aspx?id=%2Fsites%2FISISExperimentControls%2FICP%20Discussions%2FMERLIN&viewid=45d81cb9%2D9571%2D4a80%2Da5cc%2D2cb4871703a3) and the operating manual [here](https://stfc365.sharepoint.com/:b:/r/sites/ISISExperimentControls/ICP%20Discussions/MERLIN/MERLIN%20Fermi%20Chopper%20Operating%20Manual%20Oct05.pdf?csf=1&web=1&e=5Rzsb8).<br>
+The fermi chopper is a Jülich model (FZJ - Forschungszentrum Jülich) - custom built for ISIS (therefore unique, although very similar to models installed on MAPS and MARI).  A copy of the communications manual (PDF) is [here](https://stfc365.sharepoint.com/:b:/r/sites/ISISExperimentControls/ICP%20Discussions/MAPS/Fermi%20Chopper%20Communications%20Protocol.pdf?csf=1&web=1&e=Y55Yzp) and the operating manual [here](https://stfc365.sharepoint.com/:b:/r/sites/ISISExperimentControls/ICP%20Discussions/MERLIN/MERLIN%20Fermi%20Chopper%20Operating%20Manual%20Oct05.pdf?csf=1&web=1&e=5Rzsb8).<br>
 The control program will need to include various safety-critical condition monitoring routines (e.g. overspeed, bearing voltage out-of-range).  There are some aspects of the control system which are specific to MERLIN and will need to be incorporated into the IOC.  Ideally, they would be modular (e.g. macro, configuration file) so that the main program would be compatible between the three systems (MERLIN, MAPS, MARI).  David Keymer wrote the original VIs, which are a useful reference.<br>
 The Fermi chopper on MERLIN is primarily controlled via scripts.  Scripts are used to calculate the frequency & phase, based on the energy (longer-term this calculation could be folded into IOC).  The OPI should merely display the frequency & phase, not allow the user to change them. <br>
 Current system exhibits odd behaviour at 600Hz - see if we can fix this when migrating to IBEX.<br>