Graph scaling and navigation
ModbusScope offers several axis scaling modes to support two distinct workflows: live monitoring while data is being logged, and post-session analysis after logging has stopped. Understanding the difference helps you choose the right mode for each task.
X-axis: following live data vs. reviewing history
The default Full auto-scale mode keeps the entire logged time range in view — useful for a broad overview but increasingly crowded as a session grows. Sliding window mode instead anchors the right edge of the graph to the most recent sample and shows only the last N seconds. This is the natural choice during active logging: the graph scrolls forward with each new sample, giving a live oscilloscope-like view without the x-axis continuously rescaling.
Manual mode is entered automatically when you drag the graph or draw a zoom rectangle. It freezes the x-range at whatever you have navigated to, so you can examine a specific period without the view jumping. Double-clicking the x-axis label returns it to its previous auto-scale mode.
Y-axis: tracking the visible window vs. all history
Full auto-scale sizes the y-axis to all values ever logged, which can make recent detail hard to see if earlier data had a very different range. Window auto-scale restricts the y-axis to the values present in the currently visible x-window — as you pan and zoom the x-axis the y-axis rescales to match. Pairing Sliding window on the x-axis with Window auto-scale on the y-axis is the recommended setup for live monitoring: both axes stay focused on what is happening right now.
Limit from / to fixes the y-axis at specific bounds, useful when you know the expected operating range and want consistent vertical scale across sessions. Manual mode, as with the x-axis, is entered automatically on drag or zoom-rectangle operations and can be reset by double-clicking the axis label.