Question #7099   Submitted by Answiki on 11/11/2022 at 05:33:01 PM UTC

How is built a serial frame ?

Answer   Submitted by Answiki on 11/11/2022 at 05:43:54 PM UTC


In a serial frame, bits are sent successively one after the other:

  • Idle: at idle, the line is in the high state (1).
  • Start bit: the frame always starts with a start bit in the low state (0). Since there is no clock, it is the falling edge of the start bit that will be used to synchronize the receiver.
  • Data: the data is transmitted after the bit of start by starting with the least significant bit.
  • Parity: the parity makes it possible to check the integrity of the frame. The parity is added so that the number of 1's in the data + the parity bit is even or odd. The parity bit is optional.
  • Even parity: the bit is 0 if the number of 1's in the data is even, otherwise 1.
  • Odd parity: the bit is 0 if the number of bits at 1 of the data is odd, otherwise 1.
  • Stop bit: at the end of transmission, the line is put back to idle (state 1). To enable the receiver to be ready to receive the next frame, it must be guaranteed that this idle period is sufficient. This is the role of the stop bit in the high state (1) whose duration is generally 1, 1.5 or 2 bits. After the stop bit, either the line is kept at idle until the next transmission, or it is set to 0 which corresponds to the next start bit.
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Answer by Answiki on 11/11/2022 at 05:43:54 PM


In a serial frame, bits are sent successively one after the other:

  • Idle: at idle, the line is in the high state (1).
  • Start bit: the frame always starts with a start bit in the low state (0). Since there is no clock, it is the falling edge of the start bit that will be used to synchronize the receiver.
  • Data: the data is transmitted after the bit of start by starting with the least significant bit.
  • Parity: the parity makes it possible to check the integrity of the frame. The parity is added so that the number of 1's in the data + the parity bit is even or odd. The parity bit is optional.
  • Even parity: the bit is 0 if the number of 1's in the data is even, otherwise 1.
  • Odd parity: the bit is 0 if the number of bits at 1 of the data is odd, otherwise 1.
  • Stop bit: at the end of transmission, the line is put back to idle (state 1). To enable the receiver to be ready to receive the next frame, it must be guaranteed that this idle period is sufficient. This is the role of the stop bit in the high state (1) whose duration is generally 1, 1.5 or 2 bits. After the stop bit, either the line is kept at idle until the next transmission, or it is set to 0 which corresponds to the next start bit.
Answer by Answiki on 11/11/2022 at 05:38:36 PM


In a serial frame, bits are sent successively one after the other:

  • Idle: at idle, the line is in the high state (1).
  • Start bit: the frame always starts with a start bit in the low state (0). Since there is no clock, it is the falling edge of the start bit that will be used to synchronize the receiver.
  • Data: the data is transmitted after the bit of start by starting with the least significant bit.
  • Parity: the parity makes it possible to check the integrity of the frame. The parity is added so that the number of 1's in the data + the parity bit is even or odd. The parity bit is optional.
  • Even parity: the bit is 0 if the number of 1's in the data is even, otherwise 1.
  • Odd parity: the bit is 0 if the number of bits at 1 of the data is odd, otherwise 1.
  • Stop bit: at the end of transmission, the line is put back to idle (state 1). To enable the receiver to be ready to receive the next frame, it must be guaranteed that this idle period is sufficient. This is the role of the stop bit in the high state (1) whose duration is generally 1, 1.5 or 2 bits. After the stop bit, either the line is kept at idle until the next transmission, or it is set to 0 which corresponds to the next start bit.
Question by Answiki 11/11/2022 at 05:33:01 PM
How is built a serial frame ?
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