NEC KT-X46UN User Manual page 22

 | NEC Display Wall Calibrator - UsEr's GUiDE
Next the corner location of the first display in the layout will be selected.
This should generally be the display with the lowest MONITOR ID, or IP address, so that sequential IDs or IP
addresses can be automatically assigned to the rest of the displays. This display will also be the first one to be
measured and calibrated when automatically performing these actions on all displays.
Next the order of remaining displays can be selected. Again, this selection determines how sequential IDs or IP
addresses will be automatically assigned to the rest of the displays, and the order of measurement and calibration.
Keep in mind that the automatically assigned IDs or IP addresses can be modified later if necessary.