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Trying to send data from sbRIO9623's RS232 to Odroid/Arduino

Hi guys,


I have been trying to achieve this half duplex communication for quite sometimes but I could not do it. There shows no signal when I send which data (string) from labview out of my RS232 to Odroid/Arduino. I have tried connecting the 2 RS232 pins (Tx and GND) to Oscilloscope to see whether is there data sending. It shows a flat -5V even my programme is running. 


However, when I connect to just Tx it gives me a sine wave with amplitude of 1V. I am puzzled and have no clue what I should do. 


Can someone please guide me as I am currently studying and hope to finish this programme before I graduate and pass down the project to my junior.

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