Heidenhain ROD 420 encoder pinout and new servo drive on EMCO CNC Mach3 conversion

I am wishing to connect a new servo drive to a Heidenhain encoder. The encoder is on an EMCO "EMCOTURN 242" CNC machine. The electronics are toast and we are doing a conversion to Mach3. We will try to use the original encoders because they seem like nice encoders. If these can't work with the new drive, then we will get different encoders.

Here is our problem. The EMCO Heidenhain ROD 420 encoders have 10 wires. The new servo drive has ten points to where we can connect. The Heidenhain pinout, per datasheet from Heidenhain, includes values like Ua0, _Ua0, Ua1, _Ua1, Ua2, 5V sensor, 0V sensor, Un, Up, and 0V sensor. The servo drive connections are ground power input, +5V power input, Index signal output, _Index signal output, A signal output, _A signal output, B signal output, _B signal output, NC. No internal connection, and NC. No internal connection. The EMCO will be without power during the conversion and I doubt I will be able to use an oscilloscope to determine A, B, etc. if that were possible. Is there a pin for pin conversion for those TTL values (Ua0, _Ua0, etc.) that will enable the use of the new servo? I looked at an adapter board, but that only had 4 terminal connections to input our 10 wires.

Thanks for any advice.