This is the PHC10-3 PLUS head control #A-5863-0100.

The PHC10-3 PLUS controller has replaced the PHC10-3 and the PHC10-2 and provides support for RS232 and USB communications. It uses a 24 V external power supply, manages all the PH10 and PH10 PLUS head functions and interfaces with the CMM’s computer. PHC10-3 PLUS does not manage the probe functions but does have the provision for a PI 200-3 or PI 7-3 interface card to be fitted internally.