I wanna interface a BCD thumbwheel switch to a controller through a 245 but the problem is that when I send a logic 0 on the thumbwheel switch it is converted to a high level (logic 1) by the 245, this happens because the Thumbwheel switch does not have its own ground I wanna know how I can make the input from the thumbwheel a logic 0 and make it appear like that on the output of the 245