Thanks for your very fast reply, however,thats what I saw in other posts,so I just want to be sure before I mess things up,seeing from your pict. 5V AND GND Can be connected to terminal on the Fireplace,My fire place has a terminal block that has from top: TH, P, TPTH, AND the Black wire connected to terminal TH GOES to the switch and the white wire connected to terminal TPTH goes to the switch,so where do I connect the black wire to the I/o Linc and where do I connect the white wire to the I/o Linc, and what wire goes to the switch. Thanks