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11.11.2016
Modbus Constructor 1.7 is compatible with Windows 10.
27.04.2015
Modbus Reader 1.6.2 released.
25.10.2010
Modbus Constructor 1.6.0 and Modbus Reader 1.6.0 released.
17.02.2010
Modbus Reader 1.3.0 Released.
10.10.2009
Modbus Constructor 1.1.12 Released. Some minor bugs fixed. Trial period renewed.
27.03.2008
Modbus Constructor 1.1.11 Released. Trial period renewed.
16.10.2007
Modbus Reader 1.2.14 Released. Some minor bugs fixed.
16.04.2007
A prerelease of the version 1.2 of Modbus Reader is now available. Data logging capability is added for a single device as well as for multiple devices.
04.03.2007
ModBus Constructor v1.1 Final Release is available (several critical bugs fixed, performance is improved).
» View QuickStart Guide..
12.02.2007
QuickStart Guide in French and German added to download area.
» View QuickStart Guide..
28.11.2006
QuickStart Guide is now available in Russian, Italian and Spanish!
» View QuickStart Guide..
01.11.2006
Modbus Constructor v1.0 RC1 Released.
» Download Evaluation..
 
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FREQUENTLY ASKED QUESTIONS

I have created a project which contains a few holding registers with addresses: 40001, 40002 and so on. But Modbus Reader reports Exception 2: ILLEGAL DATA ADDRESS.
The thing is, that notation like 4xxxx is not a pure address. It is alias that defines both address and type of Modbus item. For example:
40001 is holding register with address 1 (or 0);
00001 is coils with address 1 (or 0);
Two previous aliases are very common. It is good practice, when a manufacturer defines clearly such a notation in a user's manual.

Why Modbus Constructor is not a SCADA system?
Modbus Constructor and Reader are simple and convenient tools for communication with Modbus devices. There are useful for hardware and software developers and field engineers. If they would be a SCADA they were not convenient or not simple.

Where can I get Modbus protocol specification?
Use the following link: http://modbus-ida.org/specs.php

Does Modbus Constructor meet to Modbus IDA specifications?
The application has been fully tested with Modbus TCP toolkit, which provides a serial interface too.

Could you help me to implement Modbus slave on my microcontroller?
Of cause! Download an example project simple Modbus slave for Atmel AvrStudio and WinAVR. The target platform is Atmega2561, but it can be easily ported to any AVR or other microcontrollers.
Do not hesitate to ask if any question!
Design by Kury