When measuring an active High Speed (HS) CAN bus system, what should the combined voltages of the bus HI and LOW equal?

In an active High Speed CAN (Controller Area Network) bus system, the combined voltages of the bus Hi and Low should indeed equal 5VDC (+/- 5%). This is because the CAN bus is designed to operate with a differential signaling method, where the voltage levels of the CAN High (Hi) and CAN Low (Low) signals are used to represent data.

During normal operation, CAN High typically operates at approximately 2.5V to 3.5V above ground, while CAN Low is around 2.5V to 3.5V below ground, resulting in a differential voltage that effectively equals 5V when measured between the two lines. This differential signaling allows for improved noise immunity and enhances the communication integrity over the network.

Other voltage levels presented in the options do not accurately represent the standard specifications for a High Speed CAN bus system. Therefore, it is crucial for those working with these systems to understand the standard operation at 5VDC so they can properly interface with the technology and ensure reliable communication.