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2. Terms and Definitions
2
2. Terms
and
Definitions
Term
Explanation and Definition
Protocol macro
A protocol macro is a function that stores a data send/receive procedure
(protocols) in a Serial Communications Board or Serial Communications
Unit to exchange data with general-purpose external devices by
executing the ExecPMCR instruction on the CPU Unit.
Protocol
A unit of independent communication processing with a specific
general-purpose device. A protocol includes a data send/receive
procedure. A protocol consists of multiple sequences.
Sequence
A unit of the independent communication processing which can be
started by executing the ExecPMCR instruction of a program. A
sequence that is started will execute steps registered in its own
sequence.
Step
A unit to execute any one of the followings: message send processing,
message receive processing, message send/receive processing, clear
receive buffer, or step wait. Up to 15 steps can be set per sequence.
Send message
A communication frame (command) sent to the external general-purpose
device. A send message is read from the step in the sequence, and sent
to the external general-purpose device.
Receive message
A communication frame (response) sent from the external
general-purpose device. A receive message is read from the step in the
sequence and is compared with data received from the general-purpose
external device.
Matrix
A matrix is used when a general-purpose external device sends multiple
types of communications frames (responses). More than one
communication frame can be registered in one matrix.
Case
A unit to register multiple communication frames (response) to a matrix.
One communication frame is registered as one case. Up to 15 types of
cases can be registered per matrix.
AT
(AT specification)
This attribute allows the user to specify an address assigned to a
variable. An I/O port or an address in memory used for CJ-series Units
can be specified.
Содержание V400-R2 Series
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