On the Sheffield CMM, PC-DMIS does not control when the CMM is in manual control or DCC control. The buttons to control this are on the jog box. The operator must select "AUTO MODE" or "MANUAL MODE". If PC-DMIS is trying to move the CMM and it is in Manual mode, the one line readout on the jog box will tell you that Auto mode is required. Once you press the auto mode button, the CMM will execute any DCC moves that have been sent to the controller.
If you have been executing in DCC, and PC-DMIS asks you to take a manual hit, you need to press the MANUAL and JOY buttons to enable the joysticks. There are also FAST and SLOW buttons that work in both DCC and Manual modes.
If you want to stop the CMM, just press the MANUAL button. You can press the AUTO MODE button to continue the move later.