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5 USER GUIDE
5.1.9 Message transmission
(1) Message transmission overview
The message transmission function supports asynchronous data exchanges that are made
between nodes.
The fundamentals of the message transmission function are described below.
When a node receives the token, it can transmit up to one frame of data before cyclic
frame transmission.
The maximum amount of data that can be transmitted in one session is 1,024 bytes.
A special algorithm is employed to ensure that the refresh cycle time limit for cyclic
transmission is not exceeded.
One-to-one transmission for sending data to a preselected remote node and one-to-n
transmission for sending data to all nodes are both achievable.
In one-to-one message transmission, the delivery verification feature is available to check
whether transmitted data is properly received by a recipient.
Request
Node 1
Request
Node 1
Node 2
One-to-one transmission
Reception
Node 2
One-to-N transmission
Figure 5-18 Message Transmission Overview
Response
Node 3
Reception
Node 3
5-16
Node 4
Reception
Node 4
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