Task-1
(a) The letter ‘H’ has the ASCII code 0x48. Show the complete word that would be used to send this character over a serial port link using the 7-E-2 format, sending the most significant bit first.

7-E-2 format has seven data bits, even parity bit, two stop bits
Start bit 0
data 0x48 1001000
even parity (1+1) = 0
Two stop bits 11

Sending bits 01001000011 total 11 bits

(b) An asynchronous communication link sends the message Hello. How are you? What are you going to do today? over an RS232 link using ASCII encoding and 38400 7-E-2 format.
Calculate how long the message takes to send.
Calculate the overhead associated with the protocol (i.e. the number of non-data bits sent divided by the total number of bits sent).

The message is “ Hello. How are you? What are you going to do today?”
Total 51 characters are available.
The baudrate is 38400 and the bit per second is 2.6042e-05 sec
51x11 bit = 561 bits and total time 561x2.6042e-05 = 0.0146

(c) The devices at either end of a serial port link must use baud rates that are approximately equal. Explain what factors determine the degree of baud rate mismatch that is tolerable. Calculate the maximum allowable mismatch when using 38400 7-E-2 format.
Usually, If the receiving UART device has a baud rate mismatch of more than 5%, then a error of framing can occur when the stop bit is captured incorrectly. Below the %5 error rate acceptable for the serial communication. We try to calculate it;
Ttx = 1 / baudrate = 26,042 us

Problem 1. A fast acting brake on a fast turning lathe is estimated...