![]() If a signal was on an equal length of time as it was off, you would have 0, 1, 0, 1, 0, 1 as the binary message being sent out. It could represent what the throttle position voltage is, a signal being sent from the airbag module to the BCM reporting the status of a sensor. This could be a either a J1850 or CAN-Hi bus. Whatever the bus message, it’s comprised of 0s and 1s, or the states of highs and lows. Some systems use a variable pulse width that not only toggles between on/off, but can transmit additional information by varying the length of time the voltage is either on or off. ![]() This is how all serial data buses operate. ![]() What separates the earliest serial data bus from a modern CAN bus is how fast the system can toggle between 0 and 5 volts. ![]() The faster the switching, the more information can be transmitted in a given amount of time. ![]()
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