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Answer it!
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Of the five connections:
Two are to the coil. They're interchangable. Apply and remove power across these to switch the output.
One is output common. One is output normally-closed. One is output normally-open. When power is not applied to the coil, common is connected to normally-closed. When power is applied, common is connected to normally-open.
As far as which pin is which: The relay may have come with a small diagram labelling the pins, or the may be labels on the relay itself (often just a letter or two -- NC, NO, and so on), If not, you can figure it out with a bit of experimentation... or, if the case is transparent, you can often figure it out by inspection.
Two are to the coil. They're interchangable. Apply and remove power across these to switch the output.
One is output common. One is output normally-closed. One is output normally-open. When power is not applied to the coil, common is connected to normally-closed. When power is applied, common is connected to normally-open.
As far as which pin is which: The relay may have come with a small diagram labelling the pins, or the may be labels on the relay itself (often just a letter or two -- NC, NO, and so on), If not, you can figure it out with a bit of experimentation... or, if the case is transparent, you can often figure it out by inspection.
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