Set those channels which are to be enabled to provide the data for events. 
The mask cannot be changed while acquisition is running.


Channel Enable Mask (0x8120, R/W, C)
This register enables/disables selected channels to participate in the event readout. If disabled, the samples of the relevant channel are 
lost.
WARNING: this register must not be modified while the acquisition is running.
Bit Description
[7:0] Bit n can enable/disable selected channel n to partecipate to the
     event readout. Options are:
    0: disabled;
   1: enabled.
[31:8] Reserved