Novak Sentry Problem
 

I have three Sentry Pros ans about seven current monitors. I just got around to connecting them to a computer to use the real time mode. I have not been able to get the current monitor function to work. I have tried two different Sentry modules and three different current sensors. I have double checked the polariy on the current sensors. I have the sensor on the negative wire of the esc with the negative connection soldered to the negative wire t the battery. All other functions (voltage, speed etc.) appear to be working.

Is there something I missing?