Instead of voltage through the wires, you have pulses, which is read with frequency. All data is read and outputs are updated 10 times per second. Its a talk then listen aspect - talk cycle updates tth he outputs and the listen cycle reads the inputs.
That being said, my Hz are no where near 1200 on my group and hall station. Even after removing both risers I have around 50-90Hz. That's after completely removing the wires completely off the controller.
