P&F Mux cards and AMS

I cannot scan a series of 10 mux cards with AMS.  When using a separate Hart Mux scanning software I can see all cards and instruments.  When I rescan with AMS one card at a time there is only one card that fails, why will AMS not complete the scan of the other 9, and how can I identify why AMS won't scan one card when other software can.  The mux cards are P&F HD2700 and are in series using RS485.  All suggestions are appreciated.


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