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TDC1000-TDC7200EVM: Proper usage of Evaluation Board

Part Number: TDC1000-TDC7200EVM

Hi, I am trying to connect 2 ultrasonic sensors (one as transmitter and the other as receiver). I am completely new to the device and I have not found any documentation that can help me with the proper usage of the device. I connected a single sensor to the TX1 port and I was able to obtain the TOF. But that doesn't make sense to me. Shouldn't I get the output only when I connect to the RX ports.

Please help me in understanding the Evaluation Board. 

Thank you in Advance.