There is one cabling change between the DR-1X and DR-2X. The DR-2X requires DB15 - pin 12 to be grounded to put the repeater into analog mode, as opposed to pin 11 on the DR-1X. Otherwise, the wiring harness and everything else is the same. I recommend a cable from Marshall at URI Cables and to generically follow Dave’s article for assistance. Repeaters
The RA-40 in Dave’s article resulted in the RA-DR1X that also works with the DR-2X.
https://www.masterscommunications.com/products/radio-adapter/radr1x.html