Hood, I wasn't sure if the pullup was in the unit or not. I just thought that by adding one we would be sure that there was nothing floating.
Chris, you either use a pullup to pull the signal high or a pulldown to pull it low.... not both.
In an "active low" circuit, a pull "up" is used.
In an "active high" circuit, a pull "down" is used.
I hope I'm not complicating matters here, just trying to help.
RC