Thanks TumbleWeed,
The pic is running 3v3, my concern was that the generated signal from SEROUT was producing the signal in the images, but as you pointed out I set the sensor to DC from AC and the voltage measured 3v3(approx) so the generated neg-cycle was an error of the osciliscope.
ya only get what you pay for
So the answer is "SEROUT" produces TTL format