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Terms and Definitions
2. Terms and Definitions
Term Explanation and Definition
Protocol macro A protocol macro is a function that enables data to be sent and received
with general-purpose external devices.
This function can be realised by executing the protocol macro instruction
(hereinafter referred to as PMCR instruction) in a CPU Unit's user program
through storing procedures for sending and receiving data (protocols) in a
Serial Communications Board or a Serial Communications Unit to
exchange data with general-purpose external devices.
Protocol A unit of independent communication processing with a specific
general-purpose device. A protocol includes procedures for sending and
receiving data. A protocol consists of more than one sequence.
Sequence A unit of the independent communication processing which can be started
by executing the PMCR instruction in a program. A sequence that is started
by the instruction executes 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, receive
buffer clear, or step wait. Up to 15 steps can be set for per sequence.
Send message A communication frame (command) to send to general-purpose external
devices. A send message is invoked by steps in the sequence and is sent
to general-purpose external devices.
Receive message A communication frame (response) received from general-purpose
external devices. A receive message is invoked by steps in the sequence
and is compared with data received from general-purpose external
devices.
Receive matrix A function to register and use some communication frames (responses)
when more than one communication frame is expected to be received from
general-purpose external devices. The receive processing can be
executed according to registered communication frames by using this
function.
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