In order to decode serial data, the receiver or instrument is must use the same bit rate as the transmitter. Additionally, it is important to understand how fast the bits are being generated, or in other words, what the “bit time” or “bit rate” is. Note: Differential probes are very helpful for these measurements.ĭefining the “0” and “1” voltage levels is not enough to determine what bits are receiving. Differential means that a 0 or 1 is defined based on the difference between two voltages, rather than with respect to ground. Serial protocols used in challenging environments, such as automotive, often use a differential voltage, since differential signals tend to be more immune to noise. In fact, this is how some serial protocols work. In other words, how are bit values determined from voltage levels? A simple approach would be to define that a “low” voltage equals zero and a “high” voltage equals one. Protocol: which messages are exchanged under which circumstancesīefore doing any kind of digital decode, we need to be able to tell the ones and zeros apart.Framing: how bits are organized into groups and the role of each bit or group of bits.
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