HEIDENHAIN iTNC 530 HSCI Technical Manual page 1520

When using a wireless handwheel and the HRA handwheel adapter at X23,
you must ensure that the assignment between the handwheel and the HRA
is unambiguous. The wireless handwheel serial number and the HRA serial
number are used for mutual assignment. When the control to which the HR
and the HRA are connected is switched on for the first time, both units
exchange their serial numbers and store them. This process is called "pairing."
To do this, the wireless handwheel must be located in the HRA. If this is the
case, the HR and the HRA communicate only over the serial interface.
Both serial numbers (HRA and HR) will then also be saved in the control. If you
remove the HR from the HRA during the initialization process, the process will
be canceled and a corresponding error message will be issued.
During the emergency stop test and when the connection to the wireless
handwheel is set up, the system ensures that only the HR and the HRA are
addressed, whose serial numbers have been assigned unambiguously to each
other. If a difference is found in one of the comparisons of serial numbers, the
connection will be terminated. During this entire process the relays in the AP
for the emergency stop and the permissive buttons remain open.
1520 HEIDENHAIN Technical Manual iTNC 530 HSCI