Describe different data flow modes between two devices in data communication with proper figures and examples (Hint. Simplex, Half-duplex and Full-duplex).

 

In data communication, data flow modes define how data is transmitted between two devices. The modes specify whether the communication is one-way or two-way, and whether it can occur simultaneously in both directions. The three primary modes of data flow are:

1. Simplex Mode

- Description: 

   In simplex mode, communication is unidirectional, meaning data flows in only one direction. One device is the sender, and the other is the receiver. The receiver cannot send data back to the sender.

- Example: 

   A classic example of simplex communication is a keyboard and a monitor. The keyboard sends data (keystrokes) to the computer or monitor, but there is no data sent back from the monitor to the keyboard.

- Figure:

   ```

   Sender  ----------------------->  Receiver

            (One-way communication)

   ```

2. Half-duplex Mode

- Description: 

   In half-duplex mode, both devices can send and receive data, but not simultaneously. When one device sends data, the other can only receive it, and vice versa. Communication happens one at a time in alternating directions.

- Example: 

   Walkie-talkies are an example of half-duplex communication. When one person speaks (transmits), the other can only listen (receive). They need to take turns to communicate.

- Figure:

   ```

   Sender  ----------------------->  Receiver

               (At one time)

   Receiver  <-----------------------  Sender

               (At another time)

   ```

3. Full-duplex Mode

- Description: 

   In full-duplex mode, communication can occur in both directions simultaneously. Both devices can send and receive data at the same time without interference.

- Example: 

   Telephones are a prime example of full-duplex communication. Both parties can speak and listen at the same time without needing to wait for the other to finish.

- Figure:

   ```

   Sender  ----------------------->  Receiver

               (Simultaneously)

   Receiver  <----------------------  Sender

   ```

Summary of Data Flow Modes:

1. Simplex: One-way communication (e.g., TV Broadcast).

2. Half-duplex: Two-way communication, but not simultaneous (e.g., Walkie-talkies).

3. Full-duplex: Two-way communication simultaneously (e.g., Phone call).

These modes determine how devices interact and share data, and the choice of mode depends on the specific requirements of the system or application.