Hi Morne & Raven,
you can also use a string constant set first to normal display, input AT+BT!!, then switch to hex display and insert 08 at the right position - no need for string concat

AT+BT!<del>! = "4154 2B42 5421 0821"
Best regards,
GerdW

using LV2016/2019/2021 on Win10/11+cRIO, TestStand2016/2019