Hi Lee


1) Do you mean the signal 0-5V?
Yes. The output is a constant 5V.
2) What shape is the waveform? Sinusoidal, square, etc.
Square
3) Does the signal include any noise, i.e. does it come from an external device, or from a nearby
logic chip?
Signal is from an external device, which will be connected to the 8051.
4) What is the approximate frequency of the activated state and deactivated state?
I have not exactly measured the value, just was observing the pattern on the scope.Roughly it is one is to ten.
5) What language are you coding in?
Assembly language.


As far as activating the device goes it is random and not a one time activity.The time of activation can be as low as one tenth of a second to a max of half a second.

Regards
Pramod