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Questions about interpreting isoSPI: One cell voltage reading in the middle of the stack is 0.7V below expected

Category: Hardware

Hello, I am designing a BMS using the LTC6813. I built a custom board to balance 18 cells and communicate using isoSPI. Currently, I am debugging the board using the DC2792B isoSPI adapter plugged into the Linduino and I am running the test code from the LTSketchbook titled DC2350AB. To emulate a battery pack, I have connected 1000 Ohm resistors in series and connect the top and bottom to 60V power supply. I am unsure how to interpret the calculated packet error codes for the commands. Should the received data match the written?

I ran commands 1, 2, 3, 4 from the sketchbook to produce these results. When looping, the cell measurement is also around 2.6V. 

Also, a second question as in the title and visible in the screenshot, one cell, cell 14, is measuring around 2.6 V, whereas it is expected to be around 60/18 = 3.3V, which all the other are correctly measured at. I attached a screenshot of the schematic for this cell. I also attached the layout of the board as a reference. I have another question about discharge, which i will ask in a separate thread.