Chapter 7: Computer Link Function
[9]Message transfers
(1)Outline of the message transfer process
The message transfer process is a function that allows asynchronous data to be exchanged be- tween nodes.
The basic operation of the message transfer process is shown below.
1When a node receives a token, it will send a maximum of one frame of message data before the cyclic frame data sending.
2A maximum of 1024 bytes can be sent at one time.
3The
4The
5It has a data send confirmation function used to check whether a target node has correctly received the data in a "1:1" message transfer.
Request
7
Response
Node 1 | Node 2 | Node 3 | Node 4 |
"1:1" data transfer
Request
Receive | Receive | Receive |
Node 1 | Node 2 | Node 3 | Node 4 |
"1:N" data transfer
Outline of the message transfer process