Having both DRO and controller connected to the encoder should normally be OK, it depends somewhat on the nature of the encoder output, you need to specify if it is standard RS422 differential or push/pull or open collector.
If the DRO is suppling power the second input just needs the signals and the common, no 5v.
Al.


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ower supply common 0v,I have already done that on my mill LV power supply +5,+12,+24 vdc seperate regulated outputs,0vdc common for all.I may have been misinformed by a n other as not to common up the seperate psu 0v from DRO as it may cause a problem with overworking/heating of 5vdc regulator on Controller card ??? (shows i know very little about electronics!!!

