2.4. Interface protocol

The second step of the open NC achievement is to make the connection method of the information between each hierarchy (The interface protocol) to clear . All hierarchies and the connection methods between modules are basically opened to the public.

In the interface protocol making, it was considered as follows.

• Encapsulation of function
  Standardization or making open to the public about specification of connection between the each layer and each module should be able to. Moreover, it should be used as long as if there is an old standard.
• Abstraction of information
  It does not use a specific attribute of the hardware used and the control machine which targets. Interface information must be abstracted, and generality of the made software must be secured, and portability must be secured.
• Plug and play
  It must be showed the function enough without tuning when new function is built in.

Figure 2.4:Open NC interface Protocol chart

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