Q: Why does my DHXXX-XMXXX / DVXXX-XMXX display show “D”?

A: This indicates that the display is either not receiving any data from the driver, or something is keeping the data from being recognized.

1. This will happen when there is no communication between the MICRO COMM® driver and the display. Refer to this article Q: Why does my display show “2V”? (Some older displays may show “OK” instead.) – C.E. Electronics