NXU-2B Configuration Utility
Realtime Status
Configuration Connection Management Connection Status Realtime Status Information Manual

NXU-2B Status and Control:

Link Active:
Channel Active:
Audio In:
PTT:
Aux In 0:
Aux In 1:
Aux Out 0:
Aux Out 1:

RX refers to the expected audio input level. TX refers to the desired audio output level.