Modbus Mapper Pro
Modbus Mapper Pro
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Modbus RTU & ASCII Analyzer, RS-485 Sniffer, Mapper and Replay Tool
Modbus RTU & ASCII Analyzer, RS-485 Sniffer, Mapper and Replay Tool
Capture → Map → Record → Replay
Capture → Map → Record → Replay
Modbus Mapper Pro is a professional Windows Modbus traffic analyzer for automation engineers who need to understand and troubleshoot existing RS-485 communications.
Passively monitor live Modbus RTU and Modbus ASCII traffic, decode requests and responses, automatically build a live Modbus register map from observed traffic, view engineering values, record communication sessions, and replay captured device behavior for testing without the original hardware.
Understand Modbus Traffic Without Guessing
Understand Modbus Traffic Without Guessing
Troubleshooting an existing Modbus system is difficult when you don't know which registers an HMI, PLC, power meter, controller, or other device is actually using.
Modbus Mapper Pro lets you observe the communication already taking place on the RS-485 network and turn that traffic into useful engineering information.
Use it to:
Troubleshoot existing Modbus RTU and ASCII networks
Discover communication with undocumented devices
Identify the registers an HMI or PLC is accessing
Build and document Modbus register maps
Analyze requests, responses, addresses, function codes and values
Capture real field communication for later analysis
Reproduce recorded device behavior during development and testing
Capture → Map → Record → Replay
Capture → Map → Record → Replay
1. Capture:
1. Capture:
Connect to an existing RS-485 network and observe live Modbus RTU or ASCII communication.
In RS-485 Monitor mode, Mapper Pro is designed for passive monitoring without intentionally transmitting requests onto the network.
2. Map
2. Map
Mapper Pro decodes observed communication and builds a live Modbus map from the registers being accessed.
Configure names, data types, byte or word order, scaling and address interpretation to turn raw register data into useful engineering values.
3. Record
3. Record
Capture real request and response exchanges from working equipment for troubleshooting, documentation and repeatable testing.
4. Replay
4. Replay
Load recorded communication into Replay Emulator and respond to matching requests using the previously captured device responses.
This allows an HMI, SCADA application or other Modbus client to be tested without requiring the original field device.
Three Ways to Analyze Modbus Communication
Three Ways to Analyze Modbus Communication
RS-485 Monitor — Passive Modbus Sniffing
RS-485 Monitor — Passive Modbus Sniffing
Observe an existing Modbus RTU or Modbus ASCII network without inserting the PC into the normal communication path.
Use RS-485 Monitor when you need to:
Passively sniff existing RS-485 communication
Troubleshoot a production network
Discover undocumented device registers
Analyze HMI or PLC polling
Capture requests and responses
Build a live Modbus map
Monitor decoded values
Mapper Pro does not intentionally transmit in this mode, making it the preferred mode for observing an existing system.
Bridge / Proxy — Analyze Traffic in the Data Path
Bridge / Proxy — Analyze Traffic in the Data Path
Place Mapper Pro between a Modbus client and server when controlled pass-through analysis is required.
Traffic is forwarded between the configured serial ports while Mapper Pro simultaneously captures and decodes the communication.
Bridge / Proxy is useful for:
Integration testing
Serial pass-through diagnostics
Capturing known request/response exchanges
Recording reliable replay files
Observing communication while Mapper Pro is intentionally in the data path
Replay Emulator — Test Without the Original Device
Replay Emulator — Test Without the Original Device
Record communication from a real Modbus device and later reproduce its responses in a test environment.
Replay Emulator matches an incoming request against recorded traffic and returns the associated captured response.
Use Replay Emulator for:
HMI development
SCADA development
Bench testing
Regression testing
Commissioning preparation
Reproducing field behavior in the lab
Testing when the original Modbus device is unavailable
More Than a Modbus Sniffer
More Than a Modbus Sniffer
A traditional Modbus sniffer may stop after displaying serial frames or raw hexadecimal traffic.
Modbus Mapper Pro goes further by turning captured communication into usable engineering information.
With Mapper Pro you can:
Decode Modbus Traffic
Decode Modbus Traffic
See device address, function code, register addresses, quantities, values and CRC/LRC validation instead of relying only on raw bytes.
Automatically Build a Live Modbus Map
Automatically Build a Live Modbus Map
Turn registers discovered in actual communication into editable Modbus map points.
View Live Engineering Values
View Live Engineering Values
Configure data type, byte/word order, gain, offset, labels and address interpretation so captured registers can be understood as useful values rather than only hexadecimal data.
Find Unique Client Requests
Find Unique Client Requests
See the requests being made by an existing HMI, PLC, SCADA system or other Modbus client.
Record Real Communication
Record Real Communication
Preserve working request/response exchanges from actual equipment.
Replay Device Behavior
Replay Device Behavior
Use captured responses to emulate the recorded Modbus device during testing.
Export Your Work
Export Your Work
Export Modbus maps and captured request information for documentation, handoff and additional engineering workflows.
Instead of stopping at packet capture, Mapper Pro helps turn unknown Modbus communication into a documented and reusable register map.
Modbus RTU and Modbus ASCII Support
Modbus RTU and Modbus ASCII Support
Mapper Pro analyzes both major Modbus serial formats.
Modbus RTU
Modbus RTU
Automatic RTU frame recognition
CRC validation
Request and response decoding
Passive monitoring
Bridge / Proxy capture
Recording and replay
Modbus ASCII
Modbus ASCII
Automatic ASCII frame recognition
LRC validation
Request and response decoding
Passive monitoring
Bridge / Proxy capture
Recording and replay
Mapper Pro retains the original traffic while internally decoding validated frames into the Modbus information needed for map building and live value display.
Don't have the register documentation?
Don't have the register documentation?
Capture the existing communication → decode requests and responses → map the observed registers → record useful exchanges → replay the device behavior in the lab.
Once the map is understood, continue with Modbus Monitor XPF for active polling, testing, trending and HMI visualization.
From Unknown Device to Working Modbus Map
From Unknown Device to Working Modbus Map
Don't have the register documentation?
A practical Mapper Pro workflow is:
1. Capture existing communication between the Modbus client and device.
2. Decode the requests, responses, function codes and register addresses.
3. Map the observed registers and configure their engineering data formats.
4. Record useful request/response exchanges from the working system.
5. Replay the captured behavior when the original hardware is not available.
6. Continue with Modbus Monitor XPF when you are ready to actively poll, test, trend or visualize the discovered register map.
Modbus Monitor XPF or Modbus Mapper Pro?
Modbus Monitor XPF or Modbus Mapper Pro?
The two applications solve different parts of the Modbus engineering workflow.
Use Modbus Monitor XPF for Active Testing
Use Modbus Monitor XPF for Active Testing
Choose Modbus Monitor XPF when you want to:
Actively poll Modbus devices
Read and write registers
Scan register ranges
Simulate Modbus servers
Monitor and log live values
Create trends
Build HMI dashboards
Work with ready-to-use Modbus device maps
Active Testing → Modbus Monitor XPF
Use Modbus Mapper Pro for Passive Analysis
Use Modbus Mapper Pro for Passive Analysis
Choose Modbus Mapper Pro when you want to:
Observe an existing RS-485 network
Sniff Modbus RTU or ASCII traffic
See what an existing HMI or PLC is requesting
Discover undocumented registers
Build a map from observed traffic
Record communication
Replay recorded device behavior
Troubleshoot an unfamiliar Modbus system
Passive Analysis → Modbus Mapper Pro
Many engineers can use both.
Many engineers can use both.
Mapper Pro helps discover and document how an existing system communicates.
Modbus Monitor XPF helps actively test, poll, simulate, trend and visualize the resulting Modbus data.
Free Edition — Start With Real Modbus Traffic
Free Edition — Start With Real Modbus Traffic
The free edition provides a useful way to evaluate Mapper Pro on an actual RS-485 system.
Free features include:
Passive RS-485 Monitor mode
Modbus RTU and ASCII traffic capture
Frame decoding and traffic logging
Up to 3 live Modbus map points
Up to 10 captured client requests
Live updating of included map points
There is no need to purchase Pro before confirming that Mapper Pro can see and decode your communication.
Upgrade to Modbus Mapper Pro
Upgrade to Modbus Mapper Pro
The Pro license unlocks the advanced workflows needed for deeper analysis, mapping, recording and replay.
Pro capabilities include:
Bridge / Proxy mode
Replay Emulator
Replay recording
Replay file loading
Active response emulation
Unlimited live map points
Unlimited captured requests
Automatic map-add tools
Bulk operations
CSV map import and export
Request export and copy tools
Choose a perpetual Pro license for a one-time purchase, or use the available subscription option when that better fits your project.
Built for Automation Engineers
Built for Automation Engineers
Modbus Mapper Pro is designed for:
Industrial automation engineers
Controls engineers
System integrators
SCADA and HMI developers
Field service technicians
Modbus device developers
Commissioning engineers
Engineers troubleshooting RS-485 networks
Engineers reverse-engineering undocumented equipment
Common Modbus Mapper Pro Use Cases
Common Modbus Mapper Pro Use Cases
Troubleshoot an Existing RS-485 Network
Troubleshoot an Existing RS-485 Network
See requests, responses and communication errors without introducing another polling client.
Discover an Unknown Register Map
Discover an Unknown Register Map
Observe what the existing HMI or PLC is already reading and writing and build a map from that traffic.
Replace Missing Documentation
Replace Missing Documentation
Use actual communication to help understand undocumented or poorly documented Modbus equipment.
Capture a Working Field System
Capture a Working Field System
Record communication while the real equipment is available and bring useful request/response behavior back to the lab.
Develop an HMI Without the Device
Develop an HMI Without the Device
Replay recorded device responses so client software can be developed and tested without permanent access to field hardware.
Diagnose Integration Problems
Diagnose Integration Problems
Use passive monitoring or Bridge / Proxy mode to understand what two devices are actually exchanging instead of guessing from configuration settings.
Get Modbus Mapper Pro
Get Modbus Mapper Pro
Capture the traffic. Build the map. Record the system. Replay it in the lab.
Start with the free edition and confirm Mapper Pro works with your Modbus network before purchasing advanced features.
Download / Try Modbus Mapper Pro • Buy Pro License • Subscribe • Read the User Manual
Modbus Mapper Pro is developed by Quantum Bit Solutions for industrial automation, commissioning, troubleshooting and Modbus system development.
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