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BQ756506-Q1: No data in Tx pin from BQ756506-Q1

Part Number: BQ756506-Q1

Tool/software:

I'm using the following steps to read cell voltages from the BQ756506 via UART:  

Able to read only part ID, but not able to read voltage , current and temperature.
I've attached the TX pin waveform from the oscilloscope. However, there's no response on the RX pin.

Any insights on what might be wrong? Is there an additional step needed for BQ756506 to respond?