ADS125H01 Main Status (STATUS0) Register (address = 01h) [reset = 01h],shows that there is a Reference Voltage Alarm (bit three of this register),This bit sets when the reference voltage falls below < 0.4 V (typical). The alarm updates at each new conversion cycle (autoreset). However, the voltage reference is selected as 2.5V and the oscilloscope shows that the voltage of pin1 is actually 2.5V and Pin 32 is well grounded.
The dataRegisters is read from RREG Command.