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(Answer) (Category) Home Automation FAQ : (Category) HA Equipment : (Category) ELK Products : (Category) Magic Module :
What is the polarity of the MM's RS-485 port?
Some RS-485 modules use the A/B designation for RS-485 polarity. Others use a +/- designation.

According to ELK Tech Support:

A is the positive terminal B is the negative terminal

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