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AS-i is a system in which exchange managem ent is ensured by a single master who calls in succession, by scanning the bus, each detected slave and awaits a response.The serial communication frame sends:
* 4 data bits (D0 to D3), which are the ima ge of inputs or outputs according to the nature of the interface.
* 4 parametering bits (P0 to P3), which are used to set the operating modes of the interface.
P0 to P3 bits are used for "intelligent" devices, including AS-i ASIC (specific integrated circuit). Operation can be modified while it is running.
The address of the slave is coded on 5 bits.At the request of the AS-i master, outputs are set and the inputs for AS-i devices are sent in the slave’s response.
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