PySerial write times out when communicating with USB CDC ACMhttps://devzone.nordicsemi.com/f/nordic-q-a/67501/pyserial-write-times-out-when-communicating-with-usb-cdc-acmHi, I&#39;m trying to integrate the USB CDC ACM example into a project that I&#39;m currently running on an NRF52840 DK with SDK 16.0. My PC is running windows 10 and python 3.7 I want this project to be able to send and receive binary data to/from a PCen-USTelligent Community 13Fri, 23 Oct 2020 00:26:14 GMTRE: PySerial write times out when communicating with USB CDC ACMhttps://devzone.nordicsemi.com/thread/276516?ContentTypeID=1Fri, 23 Oct 2020 00:26:14 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6adc4181-26bf-4ae5-acc7-2cd86254f684goldwake<p>I found the problem. I was using one of our python libraries that was calling <br />_serial.setRTS(False)<br />_serial.setDTR(False)<br />after initialising the pySerial object.</p> <p>This behaviour should have been in the script that actually needs this behaviour, not our serial library.<br /><br />Strange that it hasn&#39;t caused issues in the past</p><div style="clear:both;"></div>RE: PySerial write times out when communicating with USB CDC ACMhttps://devzone.nordicsemi.com/thread/276423?ContentTypeID=1Thu, 22 Oct 2020 11:40:21 GMT137ad170-7792-4731-bb38-c0d22fbe4515:cdde0133-2057-4c30-845f-d81b947e7c05Kenneth<p>I don&#39;t know, but maybe try to look into adding some time.sleep() to give the serial port some time to process the data between opening, writing/reading and closing? At least that may give some indication to where the problem may be.</p><div style="clear:both;"></div>