The receiver boards are organised in a rack right above the MBS FEBEX case. They receive the analog signals from the detector and feed them in the FEBEX ADC. They are able to generate a logical trigger from the analog signals. You can set a threshold with the receiver board GUI:

Go to:

agmaas@hadanapc2:~$ cd ReceiverControl_dev/

Execute:

agmaas@hadanapc2:~/ReceiverControl_dev$ python receiverControl.py

Choose a channel and set thresholds. The most important threshold is the Thr. Sum