1.75 is expected with no comms. In order to fit the full cell range into 8 bits, and keep the necessary resolution, the slave subtracts 1.75V from the true cell reading before transmitting. The master then adds 1.75 to the reading before reporting it. So if there are no comms, it reads 0, and adds 1.75V
One test u can do is measure the voltage across the likes of each data bus. They should normally be held high at 5V, and pulled low for each bit that is transmitted.
Threads relating to the BMS system begun by Peter Perkins
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