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Data Transmission

Data Transmission. Communication mode. Simplex. 2-wires loop. Tranmitter. Receiver. earth-return. Tranmitter. Receiver. Half-duplex. 2-wires. Tranmitter/ Receiver. Tranmitter Receiver. Full-duplex. Tranmitter/ Receiver. Tranmitter Receiver. 4-wires. Parallel v.s. Serial.

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Data Transmission

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  1. Data Transmission

  2. Communication mode • Simplex 2-wires loop Tranmitter Receiver earth-return Tranmitter Receiver • Half-duplex 2-wires Tranmitter/ Receiver Tranmitter Receiver • Full-duplex Tranmitter/ Receiver Tranmitter Receiver 4-wires

  3. Parallel v.s. Serial data line parallel sender receiver data line serial sender receiver

  4. Serial Transmission Mode • Asynchronous transmission • clock independent • Synchronous transmission • clock dependent

  5. line idle line idle start bit stop bit parity bit 7-8 data bits 1-2 bits Time Direction of transmission Asynchronous Transmission

  6. SYN SYN DLE STX DLE DLE DLE DLE DLE ETX Synchronous Transmission : Character Oriented Synchronization : Bisync character synchronization start of frame data end of frame transmitted addtional stuff

  7. Synchronous Transmission : Bit Oriented Synchronization closing flag opening flag data 01111110 01111110 01111101101111100 addtional bit inserted

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