Due to different manufacturers, production of isolators, wiring definition is not all the same, but use is basically the same, so requests and maintain the products are basically the same.
1. Should carefully read the instructions before use.
2. When used as the signal isolation, input should be connected in series the loop circuit, the output sampling circuit.
3. Distribution when used as isolation, input should be incorporated into the power circuit, the transmitter at the output.
4. If it is not working properly you should check that the wiring is correct, note that the power supply has no polarity.