Those links you posted had nothing but confusion because the discussion couldn't figure out what the jumpers were for or how anything was powered. I -think- they think they solved it but that wasn't clear either. But they did lead to the actual vendor sainsmart. NEVER EVER EVER BUY ANYTHING FROM THAT EBAY VENDOR OR FROM SAINSMART AGAIN!! I found the board page. It had a rar file of documents, including PCB layouts. But it was all for the WRONG BOARD. IT was for an SSR board not mechanical relays. So I looked at the 4-channel board. It had relays, but was the WRONG VERSION. Waste of time.