tamagawa encoder pinout

Hey,

next question. I have a Tamagawa AC servo with an unknown (tamagawa)
encoder on it.

The encoder has the following differential pairs:

A,B,Z,T,U,V,W.

I don't know what T,U,V, and W are. I know Tamagawa encoders have both
an absolute and an incremental output, so presumably T,U,V, and W are
the absolute portion, but does anybody know what they mean exactly (ie
I want to use them to generate some fake hall-effect signal for
commutation).

Thanks!