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I need to connect a Modbus RS485 Multifunction Instrument to PC, but unfortunately I don't have its user manual. My question is how I can make it talk to PC if I don't know its address or about its registers. The device is "Ziegler mfm 3440 Multifunction Instrument" which can measure up to 18 Electrical parameters like energy, power, voltage, current etc. I am new to Modbus, Please if someone reply me I shall be very thankful. waiting for replies......Thank you all