Automation System
An up/down counter used in a TI510PC has three inputs. Which of the following is not one of them?

None of these
Reset.
Count up
Count out
Count down

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Automation System
Digital signals:

are assigned values of 1 or 0 depending on the voltage level
have a sinusoidal shape.
can have three possible levels
None of these
have a frequency measured in units of hertz

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