Quatech RS-485 - Manual (Page 16)

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Apply “Write”
To click the item of “Write”, the meaning is to save all parameters after
configuring into the “BT RS232 Config Tool”.
Apply “Read”
To click the item of “Read”, the meaning is to load all parameters as last time
saving from the “BT RS232 Config Tool”. The local address will be updated
the real device address at first time.