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8-6. Process during abnormality
If there is an error in the contents of the message from the master, respond as follows.
8-6-1. In case of no response
In the following cases, the messages are ignored and no response is given.
① Transmission error (over run, framing, parity, CRC or LRC) is detected in the message.
② The slave address during the message is not the self address.
③ The data interval of the message is long.
RTU mode…When less than 9600bps: 20msec or more
When 9600bps or more: 5msec or more
ASCII mode…1 second or more
④ Transmission parameters do not match.
⑤ Received message exceeds the number of bytes that can be received (Sometimes no response is
given when the number of messages that can be received are received.)
Note) When slave address is '0' by write function, it there is no error in the message, message is
executed but there is no response. If the error mentioned above occurs in the message then
also there is no response, hence when slave address is '0' the normality/abnormality cannot
be judged.
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