/nordic/nordic-blog/b/blog/posts/weird-issue-with-pyserial-flow-controlEDIT: It seems less weird now. See You will never guess how JLink deals with UART flow control for the full story. Working on some Python code to control nRF51 and nrF52 targets I encountered a strange issue with pyserial. I don&#39;t have the full een-USTelligent Community 13https://devzone.nordicsemi.com/nordic/nordic-blog/b/blog/posts/weird-issue-with-pyserial-flow-controlThu, 31 Mar 2016 11:45:36 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f91d45df-b1c2-4dae-adac-21d47792bdd7Eirik Midttun0<p>Finally figured it out, see: <a href="https://devzone.nordicsemi.com/blogs/854/you-will-never-guess-how-jlink-deals-with-uart-flo/">You will never guess how JLink deals with UART flow control</a></p> <p>Pardon the clickbait format; it seemed like a fun idea :)</p> <img src="https://devzone.nordicsemi.com/aggbug?PostID=888&AppID=4&AppType=Weblog&ContentType=0" width="1" height="1">https://devzone.nordicsemi.com/nordic/nordic-blog/b/blog/posts/weird-issue-with-pyserial-flow-controlMon, 22 Feb 2016 08:36:08 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f91d45df-b1c2-4dae-adac-21d47792bdd7wlgrd0<p>You say that it is working with rtscts False, are you sure you are actually using flow control even even though the communication works?</p> <p>I have a lot of projects using flow control with rtscts True with pyserial. When not using the Segger OB I have had trouble with enabling flow control, so I have this disabled it. What Segger version is running in the OB?</p> <img src="https://devzone.nordicsemi.com/aggbug?PostID=888&AppID=4&AppType=Weblog&ContentType=0" width="1" height="1">