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IWR1443: IWR1443 UART

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Part Number: IWR1443

Working on a custom board using IWR1443. I can flash IWR1443 successfully with the binary image from SDK_2.1.04:

C:\ti\mmwave_sdk_02_01_00_04\packages\ti\demo\xwr14xx\mmw\xwr14xx_mmw_demo.bin

Commands can be sent with 'Done' acknowledgement on the 'User' UART port. After the 'sensorStart' cli command, only a  short burst of data can be observed at the 'Data' UART port at the beginning and then no more data is received. The demo bin supposes to provide a continuous data stream of the detected object coordinates and/or the heatmap data and the data can be used by mmWave Visualizer demo software. All the supply voltages including the internal ones of the chip were checked correct. Any suggestion on why no data is obtained?

Thanks,

Henry