Merge branch 'cosmic-run-904-instruction' into 'master'

Cosmic runs with the intregration setup in b904

See merge request cmsgemonline/gem-ops/gem-daq-doc!3

docs/operations/taking-data.md

@@ -237,3 +237,22 @@ optional arguments:
         4.  Start
 
 Happy calibrating and commissioning!
+
+
+# Getting a Cosmic run with the CSC-GEM integration setup in building 904
+This paragraph covers the reqired actions on the GEM side in order to be able to take Cosmic data on the integration setup using as Triggers the signals from the ME1/1 chamber, available on the setup. 
+
+As prerequisite, the GEM operator needs to have an account on the `cms904usr` network and `gem904daq04` machine. The operator needs to have the GEM DAQ software installed and working correctly, as per the instructions https://gitlab.cern.ch/cmsgemonline/gem-daq/cmsgemos . Trying taking a run as test is adviseable. 
+1. Checkout and rebase interactively the branche of this MR https://gitlab.cern.ch/cmsgemonline/gem-daq/cmsgemos/-/merge_requests/162 onto main, keeping only the commit  "WIP: Use external clock from TCDS"
+2. The AMC13 needs to be configured to recieve the TCDS as input by connecting in the input slot the yellow fiber "B" on top, and "A" on the bottom from the TCDS.  
+3. Connect to the xDAQ GEM supevisor page and initialize the GEM FSM. Refer to the CSC DAQ expert (usually Karoly Banicz) to have the proper configuration of the CSC ME1/1 chamber. 
+4. On the  `cms904usr` network, in `/nfshome0/cgalloni` there are 2 scripts (CSC_GEM_Local.sh and sendSOAP, that were provided by Karoly) that the operator can copy in their local folder. 
+5 The Cosmic run with the ME1/1 chamber providing the triggers, can be taken by using the above scripts to change in the right order the FSM of the GEM and the CSC.
+```
+sh CSC_GEM_Local.sh Configure
+sh CSC_GEM_Local.sh Start
+sh CSC_GEM_Local.sh Stop
+```
+6.  Tha GEM raw data will be collected in the user's `/tmp/` folder, and overwritten at every run. 
+
+