HS Modbus Test
Norway

Modbus Test is a modbus master tool I built to test connections to RTU's using modbus over a com port or TCP/IP. You can connect to slave device 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 an hexadecimal ASCII encoding of data and a 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 continuos 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.

The Register Model

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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