A method of actively controlling the impedance of a contact input of an electronic circuit, the method comprising: maintaining a contact input in a first state and an impedance of the contact input at a first impedance level; validating that the communication signal sent to the contact input is a valid change of state for the contact input; changing the contact input to a second state; and adjusting the impedance of the contact input to a second impedance level using adaptively active impedance when the communication signal is validated; the method comprising: either verifying that a communication signal is above a first threshold value before the validating, wherein the validating comprises assuring that the communication signal remains above the first threshold value longer than a first predetermined duration, the first state is an OFF state, the second state is an ON state, and the second impedance level is higher than the first impedance level; or verifying that the communication signal is below the first threshold value before the validating, wherein the validating comprises detecting that the communication signal remains below the first threshold value longer than a first predetermined duration, the first state is an ON state, the second state is an OFF state, and the second impedance level is lower than the first impedance level; wherein during a change of state from the OFF state to the ON state the changing the impedance of the contact input to the second impedance level comprises increasing a current implemented by a current source or flowing through a resistor, said current being consumed by the contact input for a period of time while a capacitively coupled voltage associated with the communication signal and generated in a wire bundle is below the first threshold value, the voltage being measured at a voltage measuring circuit in the contact input, and then reducing the current a period of time after the voltage is above the first threshold, thereby reducing an amount of power consumed at the contact input and improving an overall response time of the contact input. maintaining a contact input in a first state and an impedance of the contact input at a first impedance level; validating that the communication signal sent to the contact input is a valid change of state for the contact input; changing the contact input to a second state; and adjusting the impedance of the contact input to a second impedance level using adaptively active impedance when the communication signal is validated; verifying that a communication signal is above a first threshold value before the validating, wherein the validating comprises assuring that the communication signal remains above the first threshold value longer than a first predetermined duration, the first state is an OFF state, the second state is an ON state, and the second impedance level is higher than the first impedance level; or verifying that the communication signal is below the first threshold value before the validating, wherein the validating comprises detecting that the communication signal remains below the first threshold value longer than a first predetermined duration, the first state is an ON state, the second state is an OFF state, and the second impedance level is lower than the first impedance level; wherein during a change of state from the OFF state to the ON state the changing the impedance of the contact input to the second impedance level comprises increasing a current implemented by a current source or flowing through a resistor, said current being consumed by the contact input for a period of time while a capacitively coupled voltage associated with the communication signal and generated in a wire bundle is below the first threshold value, the voltage being measured at a voltage measuring circuit in the contact input, and then reducing the current a period of time after the voltage is above the first threshold, thereby reducing an amount of power consumed at the contact input and improving an overall response time of the contact input.