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(4) If there is no match, the slave discards the request message, then waits for a next request
message (non-response status).
(5) After sending a request message, the master checks if it receives a response from the slave.
If there is no response or exception response message (exception code), the master will
perform a communication error process.
Master
Slave
Request message
Command
Response message
Command
Response message
Exception code
No response
