A RS$232$ data frame is a group of data bits for communicating one character in ASCII code. There are few items$/$bits in a data frame: a$.$ Data bits $($D$\_7$ D$\_6..$ D$\_1$ D$\_0)$ with D$\_7$ being the MSB$.$ b$.$ Start bit c$.$ Stop bit$($s$)$ d$.$ Parity bit Answer the following questions: $(1)$ When data bits D$\_7$ D$\_6..$ D$\_1$ D$\_0$ being transmitted over an RS$232$ serial interface, which bit will be transmitted first and which bit last? $(2)$ In the data frame, give the transmitting sequence of the four items $($a$,$ b$,$ c$,$ and d$)$ listed above by indicating the order as $1,2,3,$ and $4.(3)$ Assuming the communication port setting being $19\mathrm{.}2$k$,8,$ odd, $1($baud rate, data bits, parity, stop bit$).$ a$.$ How many characters can be transmitted per second? b$.$ If the DCE is a temperature device which provides temperature reading with format being xxx$.$xx $(6$ characters$),$ what is the upper limit of the temperature sampling rate imposed by the port setting above?