Q: Why does my dot matrix display show “D”? (some older units may show “CE”)

A: This normally means that the dot matrix display is either getting no floor signals or the signals are the wrong voltage and/or polarity.

1. If you have a DHXXX or DVXXX display, the value of the R1 – R8 resistors will determine the signal voltage it is expecting. For 6 to 20 VAC/DC the value will be 820Ω (grey, red, brown, gold); for 24VAC/DC the value will be 6.8KΩ (blue, grey, red, gold); for 120VAC the value will be 18KΩ (brown, grey, orange, gold); and for 125VDC the value will be 39KΩ (orange, white, orange, gold).  The DH/DV displays are polarity sensitive, so ensure that the BLU/RED and RED/GRN wires have been connected to the correct return for the floor signals.

If your signal voltage is DC and you have the wrong polarity board, you will need to contact someone in our sales department and order a new board that is set up for the correct polarity.