Have you got just one channel working and reading accurate input voltages?
If you put ;
0V input what do you get RAW from the 2414?
1V input what do you get RAW from the 2414?
2V input what do you get RAW from the 2414?
3V input what do you get RAW from the 2414?
4V input what do you get RAW from the 2414?
5V input what do you get RAW from the 2414?
For 0v
RAW TX: B4
RAW RX: 1503D8A1
VOLTAGE: -1.716403V
For 1v
RAW TX: B4
RAW RX: 19681DA0
VOLTAGE: -1.030203V
For 2v
RAW TX: B4
RAW RX: 1DBFCDA0
VOLTAGE: -0.351683V
For 3v
RAW TX: B4
RAW RX: 22181721
VOLTAGE: 0.327203V
For 4v
RAW TX: B4
RAW RX: 2654DFE0
VOLTAGE: 0.989303V
For 5v
RAW TX: B4
RAW RX: 2ABBE761
VOLTAGE: 1.677187V