Chapter 3. Electrical Characteristics (The Physical Layer)

3. Electrical Characteristics (The Physical Layer)

 

3.1 Data Encoding: Manchester II Bi-Phase

Unlike standard commercial serial protocols (like RS-232 or SPI) which use Non-Return-to-Zero (NRZ) encoding, MIL-STD-1553 uses Manchester II Bi-Phase Level encoding.

In Manchester encoding, data is not defined by a voltage level (high or low), but by the direction of the transition at the center of the bit period.

  • Logic 0: A transition from High to Low.
  • Logic 1: A transition from Low to High.

Chapter 4.

 

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