The Doubler Ref portion of DMXRef is there to help you when you have ETC Dimmer Doublers with an ETC Sensor rack but not an ETC console:

To get the DMX address for a given Dimmer Doubler you just have to enter the number of the Dimmer Doubler without the letter and press the “Convert” button. The “A” and “B” displays will show the DMX addresses for the A and B side of the doubler. All conversions will also be added to the list and saved until you press the “Clear” button.

Still having problems, let me know.