Trying to get US Digital encoders to work

[Dival]

Our electrical plate is almost finished, and now we are trying to get our encoders to work, so we can test some features in the programming. However, we could not get the encoders to work on the robot. The encoders are showing lights, but we cannot see anything on the dashboard.
We tried switching cables and DSCs, but with no success.
We connected an encoder from another robot to the same elctronic system and it worked. We know that they are from different model. The encoders on the robot were E4P-360-250-D-D-D-B, and the one we tried on the old robot was E4P-360-250-D-D-H-B. One didn't work, one did.
Any help? I don't know if it matters, but we are programming with java.