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Attached is a picture of a 4 channel relay. I have searched the internet for the function of the jumpers circled in red. They are labelled Low Com and High. On all sites which I have looked at they are labelled JD-VCC VCC and GND.

enter image description here

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  • $\begingroup$ I think this should be posted here: electronics.stackexchange.com while some of us have electronics experience, if you're after an 'electrical engineer', then look there. $\endgroup$ – Jonathan R Swift Aug 27 '20 at 19:51
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Each channel can be set to be triggered high or low. enter image description here See User Manual

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  • $\begingroup$ What is considered a high level trigger selection, and what is considered a low level trigger selection? $\endgroup$ – checkmate Aug 28 '20 at 9:30
  • $\begingroup$ @checkmate, the answer to your question can be found at end of document by posted by StainlessSteelRat. I have posted a snip below to help you find the information $\endgroup$ – Mahendra Gunawardena Aug 28 '20 at 10:50
  • $\begingroup$ If you look at your board or the image, high/low settings are written on there. If you download the User Manual, maybe all this information is available. $\endgroup$ – StainlessSteelRat Aug 28 '20 at 17:47
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A high level and low level trigger can be configured as the follows.

enter image description here

Note: This information can be found at end of the document from this post

Reference:

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