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What is a virtual wire ?
	
A virtual wire connects two ends of a controlled system using a radio frequency (RF) medium. The transmitting-end is hard-wired to the physical source control(s), e.g., foot pedal. The receiving-end is hard-wired to the device(s) being controlled, e.g. electro-surgical [generator].

On activation of the source controls, the [transmitter] sends a continuous stream of data packets to the receiver. Each data packet indicates the current state of the source controls. The receiver actuates the [associated] device(s) as directed by control [information] in the data packets. If the stream of data packets ceases, for any reason, then the receiver must turn off all devices being controlled, [i.e]., enter a fail-safe state.

The key element of the virtual wire paradigm is to provides a fail-safe mechanism based on a loss-of-signal (LOS) condition. LOS at the receiver-end is defined as the absence of the transmitters continuous data packet stream. If the receiver detects a LOS, it enters a fail-safe state, that typically results in deactivation of all devices being controlled.

A virtual-wired system is analogous to a hard-wired system, in that a switched [electrical] current flow gates the activation of a device; if the electric current flow ceases, for any reason, then the controlled device deactivates.

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