Right from Dennis at Z-Stuff, worked for me. If the green light is lighted after the initialization, you have to press the button on the switch machine momentarily to get the red light lighted, then follow the remainder of the instructions.
If the switch machine has both RED and GREEN "ON" together for the first two seconds at power up. If this is the case, then starting with the RED LED lighted, press and hold the button on top of the DZ-2500 until the RED and GREEN lights flash alternately. As soon as they do, release the push button. Then, turn off power. When power is turned on again everything should be fine.