Is there a way to connect MODBUS 485 without using virtual com port?

[RevolutionKwon]

I am trying to do serial 485 communication via ethernet using adam 4571.
For ASCII communication, you can change the setting of adam 4571 to connect without using virtual com port.
However, in the case of Modbus communication, communication connection is not possible without using Virtual Com port.
Of course, it is possible to connect the serial communication line directly to the PC, but it is not possible to install the serial communication line due to the distance from the PC and noise caused by the power line.
If you know how to connect Modbus without using Virtual Com port, please let me know.

[wiebe@CARYA · Accepted solution]

Why don't you want a virtual com port?

This reason is rather important to find a solution.

For instance, you won't need a virtual com port if you use a TCP\IP to RS485 converter, like a Moxa.

You could of course also use a RS232 to RS485 converter, and use a real COM port...

[GerdW]

Hi Kwon,

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@RevolutionKwon wrote:

For ASCII communication, you can change the setting of adam 4571 to connect without using virtual com port.
However, in the case of Modbus communication, communication connection is not possible without using Virtual Com port.

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As you are not using ASCII mode communication you need to use the virtual COM port created by the ADAM driver.

So why don't you want to use that?

[RevolutionKwon]

wiebe@CARYA

In case of using Virtual Com port, if the power of ADAM is cut off due to power failure during communication, the Labview program stops and the computer freezes.

[RevolutionKwon]

Hi GerdW

In case of using Virtual Com port, if the power of ADAM is cut off due to power failure during communication, the Labview program stops and the computer freezes.

[RavensFan]

No need to duplicate the message.

Does it outright freeze?  Or do you get an error message that causes it to no longer execute properly, and that if you handled that error you could allow the program to recover.

[RevolutionKwon]

RavensFan

It stops completely.

[GerdW]

Hi Kwon,

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@RevolutionKwon wrote:

It stops completely.

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How does it stop "completely"? Due to (inefficient) error handling? Due to BSOD?

Mind to attach your VI? How did you implement the serial communication with ADAM?

[RevolutionKwon]

When I checked the converter of MOXA, I confirmed that using ADAM 4572, MODBUS TCP communication is possible without using virtual comfort.
Thank you.