Ren-W needs to tap +5v from the Ren32. It's not just "plug it in and go." Someplace on the Ren32 is a spot where +5v is found -- connect a wire from that point to one of the +5v pins. The Ground connection is made when you connect the cat5 cable from the Ren-W to the RS485 OUTPUT of the Ren32. And if you have the Rev6, Rev7 or Rev8 version of the Ren-W and you're trying to transmit from the RP32, be sure there's a jumper on the Ren-W's TX pins.
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