HEIDENHAIN PWM 20 - Manual (Page 36)

August 2014 Overview of cables and adapters 37
3.6.3 Absolute FANUC SERIAL interface; feed-through (listening-in) with SA 110 (NC side)
Note
The "closed loop" check can only be run with the PWM 20.
The control must support the diagnostic function.
The data transfer can only be listened in (monitored)!