https://devzone.nordicsemi.com/f/nordic-q-a/13704/nrf51-uart-pin-configHi everyone, I pass few days to try to fix my issue whiteout success. I&#39;m working on UART example provide by SDK 10 and tried to set up a communication from my computer to the nRF51422 board. There is the code used: #define RX_PIN_NUMBER 11en-USTelligent Community 13Mon, 09 May 2016 07:10:29 GMThttps://devzone.nordicsemi.com/thread/52372?ContentTypeID=1Mon, 09 May 2016 07:10:29 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d0a6b251-07d2-4bb6-b5b5-fcfc7a55cda8shadowsky<p>The problem is the Nordic device is using UART with TTL signal and my computer RS232 who used his own signal</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/52373?ContentTypeID=1Mon, 09 May 2016 07:08:45 GMT137ad170-7792-4731-bb38-c0d22fbe4515:853ce9fb-0934-43e0-b87f-cb5a3ef4d9fbshadowsky<p>I found what was wrong and it&#39;s not from the code. My mistake was to thing UART and RS232 are the same protocol. Following this picture we can see the difference between them. <img src="http://4.bp.blogspot.com/-HWeT6EZ5xS8/UU7tpcnfw-I/AAAAAAAAAKc/aSHZLUUpD1U/s1600/UART.png" alt="image description" /></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/52371?ContentTypeID=1Mon, 09 May 2016 04:16:40 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8b78c0aa-08ce-4b45-b47b-4cee6df2aa6fMilan<p>Hi, As far as pin configuration is concerned, there must not be any issue. Problem could be there in connection with PC using some UART to USB converter. Do you receive proper data making pin as 11 and 9 ?</p><div style="clear:both;"></div>