I managed to activate the UART connection on the Raspberry Pi header using the command UART 1 on CLI, followed by INITF and then followed by SAVE. The INITF command is just for making sure the module start outputting some range data on reboot. I can see the range measurement outputs (in JSON format) while connecting to the module using minicom from the Raspberry Pi. However, it seems like the module is not taking any keyboard inputs. Tried to send the STOP command to terminate the session, but nothing happens (range measurement outputs from the saved ranging session keeps printing). Any idea what might be causing this UART transmit issue?