# HMI interface

The current state of an axis can be read by the following channel-specific CNC objects of the axis.

- requested_link_to_physical_axis
- actual_link_to_physical_axis
- link_state

In the example below, channel 1 is waiting for the acknowledgement of the request for the second axis. This can be seen by the CNC object “link_state” which has the value 2.

The command value suppression is not active in either channel.

Waiting for axis acknowledgement.