libmodbus

Interoperability with commercial Modbus products ?

Asked by Sven Crouse

Hi libmodbus group. New to Modbus and automation in general, but I'm looking at this library with ideas for some higher-level tools to do remote switching/control. I'm wondering if those on list have any experience with how this library works with existing commercial Modbus couplers like those from Beckhoff, WAGO, etc. ? In other words, is Modbus = Modbus such that I should be able interface PC with RS-xxx and commercial Modbus coupler without too much pain ?

Appreciatively,

Sven

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Stéphane Raimbault (sra) said : 		#1

Yes, the protocol doesn't depend on proprietary extensions and must works with all Modbus devices.

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Nicodemmus (jesusht) said : 		#2

Hi Sven,

I have successfully used libmodbus to do the kind of interface you require through RS-485. I am using a B&B optically Isolated RS-232 (PC end) to RS-485 (device end) converter. I haven't used the couplers you mentioned, but I understand that the library follows the Modbus specification, and I would think it will work.

You can run a couple of tests with the master-slave example programs included with libmodbus.

Revision history for this message
Sven Crouse (svenc) said : 		#3

Thanks for the reply Jesus. Based on success reports like yours I've
ordered some equipment.

Sven

On Fri, 2008-12-12 at 16:04 +0000, Jesus Hernandez Tapia wrote:
> Your question #53426 on libmodbus changed:
> https://answers.launchpad.net/libmodbus/+question/53426
>
> Jesus Hernandez Tapia proposed the following answer:
> Hi Sven,
>
> I have successfully used libmodbus to do the kind of interface you
> require through RS-485. I am using a B&B optically Isolated RS-232 (PC
> end) to RS-485 (device end) converter. I haven't used the couplers you
> mentioned, but I understand that the library follows the Modbus
> specification, and I would think it will work.
>
> You can run a couple of tests with the master-slave example programs
> included with libmodbus.
>

Revision history for this message
Sven Crouse (svenc) said : 		#4

Thanks Stéphane. I've just ordered some modbus equipment. I will
report my findings to list when operational.

Sven

On Thu, 2008-12-04 at 11:06 +0000, Stéphane Raimbault wrote:
> Your question #53426 on libmodbus changed:
> https://answers.launchpad.net/libmodbus/+question/53426
>
> Status: Open => Answered
>
> Stéphane Raimbault proposed the following answer:
> Yes, the protocol doesn't depend on proprietary extensions and must
> works with all Modbus devices.
>

Revision history for this message
Launchpad Janitor (janitor) said : 		#5

This question was expired because it remained in the 'Open' state without activity for the last 15 days.

Revision history for this message
Stéphane Raimbault (sra) said : 		#6

Fix the status

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