LED is lit, flashing indicates the connection is intermittent
(for interference), and drive off when a serial connection is
unsuccessful (You can check the baud rate setting)
DP Profibus master card and connect normal state of the
indicator is lit. flashing indicates the connection is
intermittent (for interference), and Profibus master is off
when connection is unsuccessful (you can check the slave
address, data formats, and Profibus cable )
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