The OSI Network Reference Layers, IO@, Cables@
The difference between a "serial bus" and a "serial interface" and a "network protocol" is blurring -- see busses (Modbus, X10, USB, MIDI, etc.), serial IO (RS485, SPI, etc.). See also:
http://yaspnet.sourceforge.net/ YASP: A simple and open protocol for building networks with small microcontrollers.
* Adresses length: 1 to n bytes
* Medium access: CDMA/CS/NDA (Carrier Sense Multiple Access / Collision Detection / Non-Destructive Arbitration)
* Addressing modes: unicast, broadcast and multicast
* Smallest frame: 6 bytes
* Error detection: CRC16
* Physical layer: 1-wire "open collector" or 2-wire diferential (CAN transceiver)
* Current PIC implementation: about 480 words of code and 25 bytes of RAM (interrupt driven)
* License: LGPL
Frame structureFLAG ADDRESS Payload CRC FLAG (8bits) (0-16Bits) (8 * N Bits) (16 Bits) (8Bits)
- The flag is a fixed byte (often 0b01111110 or 0x7E)
- The flag must be escaped if it appears in the data stream.
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<A HREF="http://piclist.com/Techref/networks.htm"> Network protocols</A>
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