Test external HVAC compressor control with Modbus TCP or RTU. Request installer access and a trial license from the Download page.
External Machine and System Test Platform

Simulate exact compressor behavior. Integrate the complete machine. Prove the controller.

Connect the external controller to a realistic compressor and plant simulation, reproduce the devices and signal logic of the real machine, then measure system integrity and control quality before site commissioning.

Model- and refrigerant-specific compressor behavior
Portable whole-machine Signal Logic
Modbus TCP, RTU, and assigned physical I/O
Integrity trends, events, limits, and reports
Product Purpose

One continuous path from exact compressor response to a proven integrated system.

ModbusSim joins behavior simulation, real-machine device integration, and full-system testing in one portable project.

Exact compressor simulation

Run model- and refrigerant-specific startup, loading, unloading, limits, warnings, faults, and recovery against the external controller.

Real-machine system integration

Compose compressors, circuits, economizers, water loop, confirmation, auxiliary I/O, alarms, and Modbus decoding in one plant.

Integral system testing

Run the active plant as one machine and measure commands, proofs, response timing, limits, events, integrity, and control quality.

Integrated Product Workflow

Build and test the machine in the same order it exists.

Use four controlled stages from device inventory to an evidence-backed external control test.

1

1. Define the Live System

Select I/O modules and compressors, assign each behavior model and refrigerant, confirm Unit IDs, then start communication when ownership is safe.

2

2. Configure the complete plant

Assign circuits, per-compressor or circuit economizers, water confirmation, auxiliary I/O, alarms, and logical point roles.

3

3. Compile and activate Signal Logic

Review the composed graph and ownership checks, compile an immutable candidate, then explicitly activate the approved plan.

4

4. Test the external control system

Run the integrated machine, set expected ranges and timing lanes, and use Control Quality Monitor to report integrity and control quality.

External Machine Test Workflow

Dark-theme surfaces for external machine and system-integration tests.

Configure the real plant topology, review Signal Logic, and validate system integrity in the same portable project. Select a picture to bring that stage forward.

Integrated Test Coverage

Validate one continuous chain from controller command to machine response.

The selected Compressor Behavior Model drives the complete active plant; every command, proof, limit, and measured response remains traceable.

Behavior and operating limits

Validate capacity, RPM, pressures, power, temperatures, warnings, trips, transitions, and recovery for the selected compressor model.

Signal ownership and timing

Verify controller outputs, simulated field feedback, water proof, auxiliary valves, economizers, delays, and engineering-unit conversions.

System integrity and evidence

Compare expected ranges and timing lanes with live trends, events, alarms, and the exported test report.

Integrated Verification

Inspect the active Signal Logic, then prove system integrity.

These are the two engineering views used after topology configuration and before release.

Signal Logic inspection

Signal Logic inspection

Review compiled signal paths, named I/O transformations, active logic, and exact output ownership.

System integrity and control-quality test

System integrity and control-quality test

Set expected ranges and timing lanes, run the active integrated plant, and preserve measured evidence.

Take Action

Move from product understanding to action.

Request the installer, follow the guides, or review licensing.