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I have attached the over all schematic diagram for current loop, We have to use the two different GND singal, Kindly refer the schematic
We have to verified that the load ground is connected to the input ground and also refereed the same ground as the XTR supply ground.
The input signals are 3.3V & 5V.
We have to connect the external load resistance of 220 OHM, but there is no response across the load.