dll requirment

[itsabhist]

I'm currently exploring the OpenOPC2 package for Python to interface with OPC servers in my power plant. While going through the documentation, I came across mentions of the graybox DLL required for registering and connecting to OPC DA servers. However, I noticed that I was able to fetch data from my OPC server using a test script without explicitly using the DLL. Here's the test script I used: test_read.py. Could you please clarify when the graybox DLL is required and how it relates to accessing OPC servers using OpenOPC2?

[renzop]

Hi,

The graybox automation wrapper (dll) is a wrapper around your OPC server. Even if you don't register it you could work with openopc2. (I never tested it but it makes sense). I guess some error messages could be probably less understandable that with the dll. I might be that you already have registered a dll with a similar functionality. (http://gray-box.net/daawrapper.php?lang=en)

It is one part of the project that we took over from the original OpenOPC, and we did not touch it. I am really not an expert in that area.

[itsabhist]

[itsabhist]

I am trying to connect my office server using exe file

I have set environment variable as shown in list-config

But but while I am trying to get list-server
It's showing error

As shown in above image

[renzop]

Please do not post screen photos. Please plost the terminal output as text.

[itsabhist]

Ok

[itsabhist]

`(c) 2018 Microsoft Corporation. All rights reserved.

C:\Users\Administrator\Desktop\OPC>OpenOpcCli.exe --help

Usage: OpenOpcCli.exe [OPTIONS] COMMAND [ARGS]...

+- Options -----------------------------------------------------------------------------------------------------------+
¦ --install-completion Install completion for the current shell. ¦
¦ --show-completion Show completion for the current shell, to copy it or customize the installation. ¦
¦ --help Show this message and exit. ¦
+---------------------------------------------------------------------------------------------------------------------+
+- Commands ----------------------------------------------------------------------------------------------------------+
¦ list-clients [EXPERIMENTAL] List clients of OpenOPC Gateway Server ¦
¦ list-config Write values ¦
¦ list-servers List all OPC DA servers ¦
¦ list-tags List tags (items) of OPC server ¦
¦ properties Show properties of given tags ¦
¦ read Read tags ¦
¦ server-info Display OPC server information ¦
¦ write Write values ¦
+---------------------------------------------------------------------------------------------------------------------+

C:\Users\Administrator\Desktop\OPC>OpenOpcCli.exe server-info
[12:08:29] ERROR Could not connect to OPC server: unsupported serialized class: pywintypes.com_error cli.py:344

C:\Users\Administrator\Desktop\OPC>OpenOpcCli.exe list-config
Open Opc Config:
OPC_HOST : localhost
OPC_SERVER : Ovation.OPCDAServer.1
OPC_CLIENT : OpenOPC
OPC_GATEWAY_HOST : 192.168.2.180
OPC_GATEWAY_PORT : 7766
OPC_CLASS : Graybox.OPC.DAWrapper
OPC_MODE : com
OPC_TIMEOUT : 1000

C:\Users\Administrator\Desktop\OPC>OpenOpcCli.exe list-servers
[12:12:08] ERROR Could not connect to OPC server: unsupported serialized class: pywintypes.com_error cli.py:344

C:\Users\Administrator\Desktop\OPC>OpenOpcCli.exe list-servers
[09:07:15] ERROR Could not connect to OPC server: unsupported serialized class: pywintypes.com_error cli.py:344

C:\Users\Administrator\Desktop\OPC>OpenOpcCli.exe list-servers`

here is error