Modbus Test is a modbus master tool I built to test connections to RTUs using modbus over a com port or TCP/IP. You can connect to slave devices using either the RTU or ASCII Protocols. The tool also lets you read/write holding registers, Coils, Discrete Inputs, and more.
Features:1. Read/Write Coils
2. Read Discrete Inputs
2. Read/Write Multiple Registers
3. Com RTU Protocol
4. Com ASCII Protocol
5. MODBUS/TCP Protocol
Protocol Information:
ASCII Protocol
The ASCII protocol uses a hexadecimal ASCII encoding of data and an 8 bit checksum. The message frames are delimited with a ':' character at the beginning and a carriage return/linefeed sequence at the end.
The ASCII messaging is less efficient and less secure than the RTU messaging, and therefore it should only be used to talk to devices which don't support RTU. Another application of the ASCII protocol are communication networks where the RTU messaging is not applicable because characters cannot be transmitted as a continues stream to the slave device.
RTU Protocol
The RTU protocol uses binary encoding of data and a 16-bit CRC check for detection of transmission errors. The message frames are delimited by a silent interval of at least 3.5 character transmission times before and after the transmission of the message.
MODBUS/TCP Protocol
MODBUS/TCP is a TCP/IP based variant of the Modbus RTU protocol. It covers the use of Modbus messaging in an 'Intranet' or 'Internet' environment.
|
Table |
Terminology |
Registers |
Characteristics |
|---|---|---|---|
Discrete outputs |
Coils |
0:00000 |
Single bit, alterable by an application program, read-write |
Discrete inputs |
Inputs |
1:00000 |
Single bit, provided by an I/O system, read-only |
Input registers |
Input registers |
3:00000 |
16-bit quantity, provided by an I/O system, read-only |
Output registers |
Holding registers |
4:00000 |
16-bit quantity, alterable by an application program, read-write |
Version Info. and Requirements
Version: 1.0.1
Release Notes
Requirements:
1. Windows 10 64bit and up
2. .Net 5.0
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Modbus History and Info.
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