https://devzone.nordicsemi.com/f/nordic-q-a/39215/problems-with-hwfcLet&#39;s send a string over UART. RTS signal will go low (active). So far, so good. The problem is that RTS remains active even after sending is done. And because it is still active, receiving does not work. So, how is it supposed to work? There areen-USTelligent Community 13Mon, 08 Oct 2018 06:35:05 GMThttps://devzone.nordicsemi.com/thread/151950?ContentTypeID=1Mon, 08 Oct 2018 06:35:05 GMT137ad170-7792-4731-bb38-c0d22fbe4515:50e678fe-3ff2-4fec-82df-36d1c167d0fbEinar Thorsrud<p>Hi,</p> <p>The nRF use the &quot;modern&quot; RTS/CTS scheme, where RTS is normally always asserted when the nRF is able to receive data. You can refer to for instance <a href="https://devzone.nordicsemi.com/f/nordic-q-a/27327/uart-hw-flow-control-bugs/133915#133915">this post</a> or the <a href="https://en.wikipedia.org/wiki/RS-232#RTS,_CTS,_and_RTR">RTS, CTS, and RTR section in the RS-232 Wikipedia article</a>.</p><div style="clear:both;"></div>