WorksheetsSynchronous and Asynchronous serial communication
Total questions: 20
Worksheet time: 19mins
What is the main function of a data acquisition system?
Convert digital files into PDFs
Collect real-world data and turn it into digital values for processing.
Host websites for data sharing
Store user account credentials for multiple systems
Which component converts an analog voltage into a digital number?
Digital-to-Analog Converter (DAC)
Analog-to-Digital Converter (ADC).
Actuator
A special converter that both filters noise and encrypts signals before conversion
What does a signal conditioner do?
Amplifies, filters, or otherwise prepares sensor signals so the ADC reads them correctly.
Stores sensor data for long periods
Only digitizes signals without changing amplitude
Packages signals and prepares them for network transfer over multiple protocols
Which best describes an actuator?
A device that senses temperature
A device that converts electrical commands into physical motion or force.
A memory chip used in DAQ systems
A network interface that prioritizes actuator commands in distributed control
What is sampling rate?
The number of times per second a signal is measured.
The number of bits in an ADC
The maximum voltage the ADC can handle
The rate at which the control unit issues actuator commands under load
A sensor outputs 2.0 V. ADC reference = 5 V, 10-bit ADC (0–1023). What digital value is closest?
512
400
1023
256
A PWM period = 10 ms, ON time = 2.5 ms. Duty cycle = ?
15%
25%
50%
75%
Timer clock = 1 MHz. One timer tick = ?
1 second
1 ms
1 µs
0.1 µs
A square wave toggles every 2 ms (HIGH 2 ms, LOW 2 ms). Frequency = ?
125 Hz
250 Hz
500 Hz
50 Hz
A data logger records at intervals of 0.01 s. Sampling frequency = ?
10 Hz
100 Hz
1 Hz
0.1 Hz
What is the main difference between serial and parallel communication?
Serial sends one bit at a time, while parallel sends multiple bits simultaneously.
Serial uses multiple lines for each bit.
Parallel is slower than serial.
Serial communication reduces wiring but transmits data bits one after another through a single line.
In serial communication, what does “baud rate” represent?
The number of signal changes per second.
The number of bytes per second.
The total number of frames transmitted.
The rate at which bits are sent across a single channel during transmission.
Which two types classify serial communication?
Simplex and Duplex
Asynchronous and Synchronous
Digital and Analog
Full-duplex and Single-line systems used for real-time data flow
What is the role of start and stop bits in asynchronous communication?
They mark the beginning and end of each data frame.
They correct transmission errors.
They increase baud rate.
They synchronize data boundaries between two devices during transmission.
What makes synchronous communication generally faster than asynchronous?
Both devices share a common clock signal.
It uses fewer data bits.
It adds more stop bits.
It relies on a single timing source that coordinates both devices for continuous transfer.
Which of the following is an example of asynchronous communication?
SPI
UART
I²C
USB
If an asynchronous frame has 1 start bit, 8 data bits, 1 parity bit, and 1 stop bit, how many bits are transmitted per frame?
8
9
10
11
A device transmits using 8E1 framing at 19,200 baud. How many useful data bits are sent per second?
19,200
14,000
10,000
9,600
At 9,600 baud with 8N1 format, how long does it take to transmit 100 characters?
0.01 s
0.1 s
1.0 s
0.001 s
If an 8N2 frame is used, what is its efficiency compared to total transmitted bits?
70%
72.7%
80%
90%
