Updated DAE Trouble Shooting (markdown)

Author: FreddieAkeroyd

DAE-Trouble-Shooting.md

@@ -463,4 +463,16 @@ If the run number comes back incorrectly (like as `000001`) then it means `c:\da
 
 ## SQLite database is very large 
 
-The `selog.sq3` file in `C:/Data` is used by ISISICP to store log data prior to a run end, it is then purged. It will normally only get very big if a run has not been ended for a long time, which either happens over a shutdown if logging has been left running, or on systems that do not often end runs such as RIKENFE, MUONFE, DETMON, HIFI-CRYOMAG etc. The solution is to begin and end a run, though on HIFI-CRYOMAG the scientist will normally do this themselves once a cycle to keep log data together in the same data file, so consult with them if it needs doing. Ending a run may take a while and will happen in the background, so don't stop ibex as soon as you get back to SETUP as it will likely not have finished saving. If you need to stop ibex, wait until the data file for the run you have saved appears in the archive.      
+The `selog.sq3` file in `C:/Data` is used by ISISICP to store log data prior to a run end, it is then purged. It will normally only get very big if a run has not been ended for a long time, which either happens over a shutdown if logging has been left running, or on systems that do not often end runs such as RIKENFE, MUONFE, DETMON, HIFI-CRYOMAG etc. The solution is to begin and end a run, though on HIFI-CRYOMAG the scientist will normally do this themselves once a cycle to keep log data together in the same data file, so consult with them if it needs doing. Ending a run may take a while and will happen in the background, so don't stop ibex as soon as you get back to SETUP as it will likely not have finished saving. If you need to stop ibex, wait until the data file for the run you have saved appears in the archive.  
+
+## Multiple VXI devices
+
+If you have multiple DAE2 VME crates then you will legitimately have multiple VXI devices in NI MAX. However there are cases when you can get two devices showing but have only one. This is usually because of either:
+- DAE USB cable has been plugged into a different socket in the PC
+- the DAE USB card has been changed
+in these cases when the "scan for new hardware" happens on the PC, it thinks it has found a new device. usually the old device will show as VXI0 and disconnected, the enw device as VXI1. To remedy teh situation
+- stop visa server in NI max
+- delete VXI0
+- rename VXI1 to VXI0
+- start visa server
+