Regarding the text near the ports, the COM will probably mean Common, so it will be the supply line of air (compressor). The NC will mean Normally Closed and the NO Normally Open.

To connect it in a safe way I would expect the NO should be connected to the wastegate and the NC should be open to atmosphere. In that case the valve needs to be actuated to bleed off air in order to increase the boost. Of course the question is also whether the valve is controlled in this way by the ECU. But it probably also needs some restrictors just like the amalvalve in order to set the boost levels.