Command Initiators/Executors; Summary - Allen-Bradley 1779-KFMR User Manual

Chapter 7
Introduction to Message Sets

Command Initiators/Executors

Summary

7 6
The application layer contains the command initiators and command
executors.
Command Initiators
Create the command message and pass it on down for the network
layer.
Maintain the sequence number and timeout.
Accept the reply message.
Cancel the timeout and sequence number.
Destroy the reply message when it is no longer needed.
Command Executors
Accept the command message.
Create the reply message.
Copy over certain information from the command message.
Fill in any reply information.
Pass the reply message on down for the network layer.
Destroy the command message when it is no longer needed.
This chapter provided a brief description of the different message sets
available on Data Highway II network. It also covered the overall
functions of the upper layers of protocol.
Chapters 8 through 12 describe each message and the fields each message
requires.