Protocol Analysis
Decode, visualize, and understand CAN bus communication in real time
Understanding what is actually being communicated on a CAN bus requires more than capturing raw frames. Helix combines a full database editor with real-time signal decoding and multi-axis chart visualization — letting you see physical values like temperature, pressure, and RPM the moment they appear on the bus.
How It Works
Key Capabilities
What Helix brings to the table for protocol analysis.
CAN FD support
Full support for CAN FD frames up to 64 bytes with BRS (Bit Rate Switch) and ESI (Error State Indicator) flag handling.
Real-time signal charts
Visualize decoded signals on multi-axis line charts with configurable time windows, auto-fit scaling, and LTTB downsampling.
Built-in database editor
Create, edit, import, and export signal database files directly in Helix with support for signals, value tables, multiplexing, and attributes.
Gauge widgets
Display key signals on radial (speedometer-style) or linear (bar-style) gauges for at-a-glance monitoring.
Common Challenges
Problems engineers face with protocol analysis — and why they matter.
Signal complexity
CAN signals use a wide variety of encodings — different byte orders (Intel/Motorola), signed and unsigned integers, IEEE floats, and arbitrary scaling factors. Getting the decoding wrong means incorrect physical values that can lead to dangerous misinterpretation.
Multi-signal correlation
Understanding system behavior requires analyzing relationships between signals from different CAN messages simultaneously. Viewing signals one at a time makes it nearly impossible to spot timing dependencies or causal relationships.
Unknown protocols
Not every CAN network comes with existing documentation. When no database file exists, engineers need a way to iteratively build message definitions while watching live data — a workflow most tools do not support.
High-speed data rates
CAN FD at 8 Mbit/s generates thousands of frames per second. Plotting this volume of data in real time overwhelms most charting tools, causing lag, dropped frames, or browser crashes.
Ready to get started?
See how Helix fits into your workflow. Browse our hardware, software, and plugin products.