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The communication via the serial link is provided by a byte frame protocol. These bytes take a value between 00 hexa and FF hexa.
The number of bytes of a frame is constant, but different from one type of interface to another:
Nombre |
Reception Interface |
3 |
DDO110 |
Nombre |
Emission Interface |
6 |
DDO110 |
A frame start is identified by the most significant bit of the first byte.
A frame intended to be received by an interface has this bit at 1. The other bytes of this frame will have their most significant bit at 0.
A frame intended to be transmitted by an interface has this bit at 0. The other bytes of this frame will have their most significant bit at 1.