No communication to gas price display, DM-100 DNR command 5 error

Potential Symptoms

  • Not able to communicate to the display.
  • DM-100 getting DNR command 5 error.
  • DM-100 does not say the correct function on start up sequence.


  • Product Family: Digit and Price Displays
  • Product: Fuelight or DataMaster,FL-2000, FL-2100, FL-2109, FL-2300, FL-4000, DF-2000, DF-2009, DF-2100, DF-2109, DF-2300, DF-4000
  • Component: DM-100 handheld
  • Control System: FLD-2000 or FLR-1500


  • DM-100 is set to the wrong Function.


  • Set the DM-100 to the correct function.  Follow How to set the DM-100 Handheld function?, DD2017710 for details on changing the functions.
    • DF-4000 and FL-4000 should be set to "Rate Display" function.
    • DF-2000, DF-2009, DF-2100, DF-2300, FL-2000, FL-2100, FL-2300 should be set to "Gas Price" function.
    • DF-2109, FL-2109 should be set to "Cash Credit" function.

KB ID: DD2172305

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