Some interfaces require that you toggle between Readouts and Hits Modes since these modes must operate exclusively from each other. This is due to the operation of these interfaces being in either a receiving state (Hits Mode - waiting for a hit signal) or a sending state (Readouts Mode - sending probe location data to the Probe Readouts window). An LK-RS232 interface is an example of this type of interface.
If you have an LK interface, from the Probe Mode toolbar, you can use the Readouts Mode icon to place the probe into readouts mode:
Readouts mode
If you have an LK interface, from the Probe Mode toolbar, you can use the Hits Mode icon to place the probe into hits mode:
Hits mode