ModbusScope documentation

Introduction

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ModbusScope is a graphical tool for logging and visualizing Modbus data in real time. It connects to one or more Modbus slaves over TCP or RTU, plots register values as they arrive, and exports data to CSV for further analysis.

Features

• Real-time graphing — plot Modbus register values live over TCP or RTU

• Zoom and pan — interactively navigate the graph to inspect any time window

• Markers — place two markers on the graph to measure elapsed time and value differences

• Multiple devices — log registers from several Modbus slaves simultaneously

• Expressions — write formulas to convert units or combine multiple registers into one value

• CSV export — save logged data to CSV for further analysis

New here? Start with the Your first logging session tutorial in the sidebar.

Download

• Download

Tutorials

• Your first logging session
  • Step 1 — Add a connection
  • Step 2 — Add a device
  • Step 3 — Add registers
  • Step 4 — Start logging
  • Step 5 — Navigate the graph
  • Step 6 — Stop logging
  • Step 7 — Export to CSV
  • What’s next

How-to guides

• Configure a TCP connection
  • Steps
  • See also
• Configure an RTU connection
  • Steps
  • See also
• Add registers
  • Before you start
  • Steps
  • Tips
  • See also
• Write expressions
  • Steps
  • Error handling
  • See also
• Import from MBC file
  • Steps
  • Notes
  • See also
• Use markers
  • Steps
  • Notes
  • See also
• Export data
  • Export as CSV
  • Export as image
  • Notes
  • See also
• Open a CSV file
  • Steps
  • Notes
  • See also
• Create CSV presets
  • Steps
  • Notes
  • See also
• Optimize poll rate
  • Steps
  • Reduce Modbus overhead
  • See also
• Save and restore a project
  • Save a project
  • Open a saved project
  • Notes

Reference

• Register syntax
  • Expression form
  • Address notation
  • Data types
• Expression operators
  • Arithmetic operators
  • Bitwise operators
  • Comparison operators
  • Logical operators
  • Operator precedence (high to low)
  • Unary operators
  • Number literals
  • Limitations
  • See also
• Connection settings
  • Common settings
  • TCP settings
  • RTU settings
  • See also
• Device settings
  • Settings
  • See also
• Log settings
  • Settings
  • See also
• CSV format
  • File structure
  • Column layout
  • Separators (export)
  • Separators (import)
  • Timestamp units (import)
  • See also
• Preset file format
  • Top-level structure
  • Preset fields
  • Example
  • Notes
  • Backward compatibility — XML format
  • See also

Explanation

• Connections and devices
  • What a connection is
  • What a device is
  • Why they are separate
  • How registers tie in
  • See also
• Polling and sample rate
  • The poll cycle
  • What affects how long a read takes
  • Getting a faster rate
  • See also
• How expressions work
  • Two-stage evaluation
  • What the parser can do
  • What the parser cannot do
  • The compose expression dialog
  • See also
• Diagnostic logs
  • Opening the logs
  • Log categories
  • Exporting logs
  • See also

Release notes

• Release notes