Embedded design, especially design work utilizing low speed serial signaling, is one of the fastest growing areas of digital electronics design. Customized communication protocol and bus usage is critical to design efficiency and time to market, but comes with the risk of sometimes being difficult to analyze and debug. The most common sources and types of problems when using low speed serial data in an embedded application include: timing, noise, signal quality and data. This paper recommends debug tips and describes features available in modern oscilloscopes that make debugging these complex systems faster and easier.