a$)$ You are looking at the $9$ pin COM port on a data logger via a breakout box. It is connected to a computer, but it is not sending any data, although the logger as well as the computer is switched on$.$

$$ i$.$ Is the logger a DTE or the DCE?

$$ ii$.$ On which pin would you find TxD and what voltage would you expect $($measured against ground$)?$

$$ iii.$$ On which pin would you find RxD and what voltage would you expect $($measured against ground$)?$

$($iv$)$ Which is the ground pin?