The Remotec remote can sometime appear to be disconnected from the controller. This is due to the device going into sleep mode and saving battery.
If you ware wanting to program the device and it is showing in the interface as disconnected, follow these steps:
1.  Turn the ZRC-90 over and remove the battery cover
2.  Press the “W” setup button*
3.  Replace the battery cover
4.  The message should now clear and you should see a green OK