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AD5700 Eval TXD and RXD data Mismatch


I'm using the EVAL AD5700 in duplex mode. I have not made any modifications to the hardware

I have an Arduino writing the integer 27 through the Serial port as shown in yellow below. The data seems to be generated properly, with the 0 start bit and the data following in LSB first format.

The green is the output HART data from the AD5700. I feed that HART OUT back in HART IN on the same AD5700 Eval board, and I observe the output on the RXD pin. 

The blue line below is the output RXD. As you can see the input TX and the output RX are not matched. What is the cause of this mismatch?

Corrected typo
[edited by: amostafa9 at 4:29 PM (GMT 0) on 8 Jun 2020]

Top Replies

  • Hi ,

    Seems like the TXD's baud rate is too fast. Kindly adjust it to 1200 BPS and let me know if you now get the expected result.