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I have af RUT955 Running af Modbus TCP Master reading Register 201 from Lan, where are these data storred, and can i read them through the Modbus Slave interface, and through which register number

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Queried information from the Modbus slave device is stored in Modbus masters RAM capacity, if you want to view it again it's better to set-up Data to server functionality and send the data to some kind of server, more information could be found here: https://wiki.teltonika-networks.com/view/RUT955_Modbus#Modbus_Data_to_Server

Also, if you want to query the same information on the same device, you can set up the slave device to also be the master device, which would query the same values and registers. Just do both configurations on one device, if it supports it.