ABB 3DDE300402 CMA120Basic Controller Panel
Packet communication protocol
All radio channels are subject to noise, intereference and fading. In many cases, radio channels are shared by several users of services. Packet communication protocols are widely used to achieve error-free communications over imperfect and/or shared communication channels.
Almost all short-range wireless data communications use some form of packet protocol to automatically assure information is received correctly at the correct destination. A packet generally includes a training preamble, a start symbol, routing information (to/from, etc.) a packet ID, all or part of a message and error detection bits. Other information may be included depending on the protocol
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