DRAGON™ D151
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A SERIAL INTERFACE SPECIFICATION
PURPOSE
The Serial Interface Specification (SIF) describes the requirements that two digital
systems must meet to exchange asynchronous serial data. SIF deals only with the
physical flow control and asynchronous serial transmission of data between two
digital systems. This specification does not impose any requirements on how the
data is packaged and the number of characters exchanged.
SIF data exchange generates errors under certain conditions but does not specify the
actions to take to correct the error. This is the responsibility of the software/hardware
layer above SIF.
TERMS AND DEFINITIONS
Systems
Unless otherwise noted, the systems described in this specification are digital
systems.
Inactive
Each system interprets what physical quantity represents inactive. To communicate,
two systems must have the same interpretation of inactive.
The Reader and the Host
The two systems described in this specification are the reader and the host. Only one
host is allowed to exist at any time.
A Character
This chapter uses the term
character
to generalize a unit piece of information. This
unit could be in bit, byte, word, etc.
Data
Data
refers to a group of characters.
Содержание Dragon D151
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