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The Very Simple Control Protocol (VSCP) is a free automation protocol suitable for all sorts of automation task where building- or home-automation is in the main focus. Its main advantage is that each VSCP-node can work completely autonomous, being part of distributed network of other nodes. VSCP is independent from the physical layer (e.g. CAN bus, Ethernet, RS-485, RS-232, MiWi) connecting the individual nodes to form the automation network bus. On the bus there can be nodes reading switches, controlling lighting, blinds, windows or information displays, broadcasting physical measurements (e.g. temperature, luminosity, power consumption, ...), multimedia control, burglar- or fire-alarm, etc. There is a subset of the protocol (Level I) that is very much tailored to the CAN bus and resource restricted microcontrollers. Protocol Level II is designed for Ethernet (UDP, TCP and own Ethernet-type ''Raw-Ethernet'') and wireless physical layers. All share the same common message fields & framework and can be connected through gateways. ==Event== VSCP is based on ''events''. Each time an ''event'' occurs it is broadcast towards all other nodes. Each node on the network will receive the event and will decide if this event needs to be handled or not. The example given in the diagram describes a button being pressed. This will result in node 1 sending an event message onto the bus informing all others the button is pressed. Node 2 receives the message but decides this button should not trigger an event for node 2. Node 3 receives the message and decides this button should trigger lamp 2 to turn on. There can be ''events'' for all sorts of things happening: an event can be a button pressed, a presence sensor being triggered, or the sun setting. Events can also be sent periodically, for instance a temperature reading every minute. VSCP predefines many events that could be happening. These events are defined into classes and types. Whether or not an event received should be handled is determined by the ''decision matrix'' or DM in short. Also the DM is explained further. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Very Simple Control Protocol」の詳細全文を読む スポンサード リンク
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