In order to use the Digital Link Interface with Commander3, UpLink or E-Stim Connect you need to switch Commander on on the 2B.
Switch your E-Stim Systems 2B on. once the 2B has gone through its self-check process you should see a screen similar to this;
Double Press Select in order to get into the mode select display.
Rotate the adjust knob so the display shows
22 Commander. The bottom line will be moving.
Press Select, you should now see the select option display
Now rotate the adjust knob to show Commander:On
Now press Select. At this point Commander is not yet switched on. You should now see an arrow on the bottom line of the display on the 2B.
This indicates Commander on the 2B is now active. Now you can plug in the Digital link interface cable.