https://devzone.nordicsemi.com/f/nordic-q-a/15184/cannot-able-to-transmit-data-address-in-uarthi Ole BAUCK, my slave device is STPM33 ENERGY METER using this device we can calculate vrms,irms,real power,reactive power,energy and many more.. that device is not having comman address. we can use address from 00-8A. to read active power address isen-USTelligent Community 13Mon, 18 Jul 2016 12:04:44 GMThttps://devzone.nordicsemi.com/thread/57966?ContentTypeID=1Mon, 18 Jul 2016 12:04:44 GMT137ad170-7792-4731-bb38-c0d22fbe4515:86b5b2e6-b428-4257-b734-0b1278544f74Ole Bauck<p>The problem is that 0x5c is not sent over uart? I notice you are using printf which is using app_uart_put (see retarget.c), so you should see the 0x5c transmitted to your terminal also. You are sure you are using the correct pins to the slave device?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/57965?ContentTypeID=1Mon, 18 Jul 2016 12:00:13 GMT137ad170-7792-4731-bb38-c0d22fbe4515:585dfc0a-8678-4324-ba07-b16e553fe93fOle Bauck<p>Adding previous post for reference: <a href="https://devzone.nordicsemi.com/question/87287/cannot-able-to-transmit-the-address-through-uart/">devzone.nordicsemi.com/.../</a></p><div style="clear:both;"></div>