https://devzone.nordicsemi.com/f/nordic-q-a/3227/openlog-with-nrf51-over-uartafter several attempts to debug and understand what goes in my handlers in the BLE callbacks, I thought to give a UART logger a try. this is what I&#39;m trying to use: OpenLog With a simple uart setup, even with 9600 baud rate I get no input on theen-USTelligent Community 13Wed, 30 Jul 2014 06:04:52 GMThttps://devzone.nordicsemi.com/thread/11838?ContentTypeID=1Wed, 30 Jul 2014 06:04:52 GMT137ad170-7792-4731-bb38-c0d22fbe4515:25de83fb-efef-4148-bd72-da0b73cfb1a4Oleh<p>it must be somewhere near :-) I have connected to these pins but have the same behavior. also the baud rate the same (now trying with low values).</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/11837?ContentTypeID=1Wed, 23 Jul 2014 19:18:47 GMT137ad170-7792-4731-bb38-c0d22fbe4515:66946bfe-8ac2-40aa-b024-657b909d29c9cocoa<p>Use P.09 and P0.10 as TX and RX pins on EK Board port connector P4.</p> <p>P4.2 = P0.9 = TX</p> <p>P4.4 = P0.11 = RX</p> <p>-c</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/11836?ContentTypeID=1Wed, 23 Jul 2014 11:12:32 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1daee382-42bf-4762-8fdc-1bc3e97f0736Oleh<p>I&#39;m testing with the DEV/EK kits, connecting P0.1 to RX of openlog, P0.1 is configured as TX. Power supply is taken from the board, thus is of the same level. I do not use any Pollup/down resistors, or should I?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/11835?ContentTypeID=1Wed, 23 Jul 2014 09:32:50 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e5a31a05-e957-4258-af5f-3c2b41aed3c9cocoa<p>Can you draw a schematic about how nRF51 pins are connected to OpenLog Pins ? Are the voltage level between boards the same ? Is baud rate the same ? Have you tried to swap RX with TX wires ?</p><div style="clear:both;"></div>