I do not understand where BATD is connected to? Is it connected to the negative end of the battery? I am using a single cell battery with only 2 terminals but this seems to imply there are 3 battery terminals.

Hi,I would like to connect my Sequans GM02s iot module to my Stm32L4 mcu via uart. Would the RTS Signal from the iot module connect to the CTS signal from STM32L4 or vice versa?