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Linux/IWR1642: How can I get data using echo commnad (screenshot included)

Part Number: IWR1642


Tool/software: Linux

hi. 

I am using IWR1642 with people count flashing image. 

I try to get raw data through terminal. 

I could successfully send a command message 'startSensort' and receive a 'Done' message from the iwr1642. (/dev/ttyACM0)

However, I can not see any data from the data port. ($ cat /dev/ttyACM1)

What do I missing?