ModMaster - Modbus master simulator
ModMaster is a diagnostic program that operates as a Modbus master or client. It provides all the features of Modsak's master mode, but at a lower price.
ModMaster's other main features are:
- The user can send individual requests to a Modbus slave, and ModMaster can also continually continually poll (send read and write requests to) the slave.
- Cross-platform: runs on any system that supports Java JRE 1.6 or later (serial communications is only supported on Windows and Linux x86 architectures).
- Manual and troubleshooting guide.
- Command (and command sequence) definitions may be saved for re-use.
- Informative interpreted trace of all Modbus messages sent and received.
- Logging of all register reads and writes.
- All configuration settings may be saved to and restored from files, in XML format.
- Register definitions may be imported/exported in CSV format.
- Full support for coils, discrete inputs, input registers and
holding registers, using the following
- 1 Read Coils
- 2 Read Discrete Inputs
- 3 Read Holding Registers
- 4 Read Input Registers
- 5 Write Single Coil
- 6 Write Single Holding Register
- 7 Read Exception Status
- 8 Diagnostics
- 11 Get Comm Event Counter
- 15 Write Multiple Coils
- 16 Write Multiple Holding Registers
- 17 Report Slave ID
- 22 Mask Write Holding Register
- 23 Read/Write Multiple Holding Registers
- 43/14 Read Device Identification
- Custom commands
- Invalid commands - for testing the slave's error handling
- Supports network and serial (RS232/RS422/RS485) interfaces using the following protocol variants:
- Modbus TCP (also known as Modbus TCP/IP)
- Modbus RTU
- Modbus ASCII
- Modbus RTU encapsulated in TCP
- Modbus ASCII encapsulated in TCP
- Modbus UDP (also known as Modbus TCP encapsulated in UDP)
- Modbus RTU encapsulated in UDP
- Modbus ASCII encapsulated in UDP
- All known extensions of the Modbus protocol for handling 32-bit and 64-bit integers and floating-point numbers are supported (including Enron/Daniel Modbus).
- Can transfer a mixture of integers and floats, of different sizes, in a single message.
- Flexible address mapping allows separate or overlaid address spaces (for coils, discrete inputs, input registers, and holding registers) with arbitrary bases.
- Registers are individually configurable for type (integer or float), size (1/8/16/32/64-bit), radix (binary, octal, signed decimal, unsigned decimal, hex, or char), and scale/offset.
- Supports broadcast requests (slave ID 0).
- Full support for exception responses 10/0x0A ("Gateway Path Unavailable") and 11/0x0B ("Target Device Failed To Respond").
You can download the complete version of ModMaster for a free 3-day evaluation period.