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If an error occurs, the device returns an error code. In the case of a normal transaction, the function code in the response is returned unchanged; in the case of an error, the highest bit of the function code is set to one (that is, the function code + 0x80) | |||
[[Special:MyLanguage/Файл:Modbus_transaction_ERR.png|700px|thumb|center|Modbus-транзакция с ошибками]] | [[Special:MyLanguage/Файл:Modbus_transaction_ERR.png|700px|thumb|center|Modbus-транзакция с ошибками]] |
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