Modbus-TCP Server Tester is a purpose-built utility from Modbus.org for validating, simulating, and troubleshooting Modbus TCP communications. Designed for controls engineers, system integrators, and QA teams, it helps you verify interoperability between clients and servers, reproduce edge cases, and accelerate commissioning across PLCs, gateways, HMIs, and SCADA systems.
Key capabilities:
- Spin up a configurable Modbus TCP server with custom IP/port, unit IDs, and data table sizes.
- Read and write coils, discrete inputs, holding registers, and input registers using standard Modbus function codes.
- Emulate registers with common data types (signed/unsigned 16/32-bit, floating point) and configurable endianness.
- Monitor live traffic with time-stamped requests and responses, decoded fields, and exception codes for fast diagnostics.
- Log test sessions to files for reporting, regression tests, and compliance documentation.
- Inject test conditions such as response delays, exception responses, and out-of-range addressing to validate client behavior.
- Save and reload test profiles to repeat scenarios consistently across teams and projects.
Benefits:
- Shorten integration and factory acceptance testing by exposing protocol issues early.
- Improve reliability by validating error handling and boundary conditions.
- Streamline troubleshooting with clear visibility into Modbus PDU/ADU exchanges.
Developed by Modbus.org, the organization behind the Modbus protocol, Modbus-TCP Server Tester delivers a practical, standards-aligned toolset for teams that need dependable Modbus TCP testing without unnecessary complexity.
Modbus-TCP Server Tester is developed by Modbus.org. The most popular version of this product among our users is 1.0. The name of the program executable file is Modbus Server Tester.exe.
You can check Simply Modbus TCP Client, TCP Client Server, Simply Modbus TCP and other related programs like Advantech ModbusTCP OPC Server at the "download" section.
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