Their is no synchronization, between the software and the vacuum, besides the way that it is reading through the relay(on/off method).
The vacuum pump is controlled by a circuit that has a pressure sensor, not included, (similar circuits used in industrial applications carry a very high price due to their specialization. This circuit keeps a range of suction in the tank at all times so the picking can be at its best performance. The range of suction is controlled by two potentiometers (components that can be adjusted like a dial on a stereo) to maintain a high and low vacuum and only run the vacuum when the tank needs to be . This vacuum is shown in inches of mercury. The higher the inches of mercury (Hg), the higher the vacuum.
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Which software does one use to connect the vacuum suction relay to synchronise with the pick and place part