Compuprint 10200 Programmer Manual Manual do Utilizador descarregar pdf (Página 212)

Interfaces

208

The link protocol is mainly based on the following three phases:

• Negotiation Phase

This phase is activated always by the host, only when in compatibility mode, and defines:

- whether a bidirectional link protocol can be established.

- the handshaking mode as well as the communications mode to be used.

- the device identification, if supported.

• Communication Phase

This phase is based on well defined handshaking rules which depend upon the selected link

mode.

• Termination Phase

This phase is initiated by the host and returns the interface to the compatibility mode.

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