VB code for MODBUS RTU

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i want to connect a Energy meter to PC and want to receive electrical data on excel files using VB code. the protocol supported by energy meters is MODBUS RTU. need a sample code to do this task.
Thank you in advance

Posted 25-Aug-14 20:33pm

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Sergey Alexandrovich Kryukov 26-Aug-14 2:49am

Excel... Oh, gosh... Anyway, you don't need the sample code. What would be the use of it if it supports different devices? You need documentation on your meter, RTU, on MODBUS, frame format (ASCII? TCP?) and the MODBUS hardware you use, and some MODBUS library...
—SA

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Sergey Alexandrovich Kryukov · Answer 1 · 2014-08-25T20:57:00

Please see my comment to the question.

In principle, you can wrap the available C library MODBUS library using .NET P/Invoke: http://www.protocessor.com/solutions/Free-Modbus-RTU-Source-Code.php[^],
http://libmodbus.org[^].

But you can find available native .NET library. Please see:
http://modbus.codeplex.com[^],
http://www.modbustools.com/modbus_wsmbt.asp[^],
http://www.mesta-automation.com/modbus-with-c-sharp-libraries-examples[^],
http://code.google.com/p/nmodbus[^].

See also these CodeProject articles:
Simple Modbus Protocol in C# / .NET 2.0[^],
Modbus TCP class[^].

I hope you are not going the make a problem because of having C# code instead of VB.NET; it does not really matter; developers of serious library hardly will deal with non-standard language like VB.NET.

—SA

cadiazran · Answer 2 · 2015-10-07T03:32:00

Hi, I'm using the same code for this on .Net <<([^])>>. I have a PLC connected to a PC through Modbus RTU (RS485). Between PLC and PC I have a RS485-RS232-USB converter.

I'd like to know how this program could read and write memory registers of 4 bytes (2 words) size. I need to handle memory registers with float data type and others with negative values. I have a PLC with the next registers (dropbox image) that I need to read and write, so I'll be very pleased if you could give me some help with this.

This is the link with the PLC registers <<([^])>>

Thanks!.

VB code for MODBUS RTU

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