IzoT TM CT Release Notes

Release 4.5, August 2021

Copyright © 2013 – 2021 Dialog Semiconductor Corporation
All Rights Reserved


The IzoT Commissioning Tool (CT) is a graphical software tool based on Microsoft Visio that you can use to install and commission a network of LON devices by simply drawing your network using the powerful and easy-to-use Visio software.  As you draw your network, IzoT CT communicates with your devices to make them match your drawing.  To make two devices communicate, you draw a line between them.  The result is a network drawing that serves as the as-built documentation for your network.

The “IzoT Commissioning Tool” name is the current name for the software previously called the OpenLNS Commissioning Tool (CT) and the LonMaker Integration Tool.  The “IzoT Net Server” name is the current name for the software previously called the OpenLNS Server and the LNS Server.  The product names referred to by the IzoT CT and IzoT Net Server software and documentation are not all updated to the new IzoT names, so you may see references to both sets of names in the software and documentation.

The following sections describe IzoT CT 4.5:

·         Requirements

·         Releases

·         Changes

·         Warnings

For additional documentation, see the Resources listing at https://www.dialog-semiconductor.com/products/industrial-edge-computing/izot-commissioning-tool-ct.  For the latest software updates, see http://iecdocs.diasemi.com/display/PortTL/IzoT+CT+and+OpenLNS+CT.


Following are system requirements for computers running IzoT CT:

·         64-bit and 32-bit versions of MicrosoftÒ Windows 10, Windows Server 2019, and Windows Server 2016.

·         1GHz x86 or x64 processor or faster with SSE2 instruction set or newer (2 GHz or faster processor recommended).

·         Microsoft .NET Framework 4.8 or newer.

·         LON/IP or LON Network Interface.  You can use any OpenLDV 5.1 compatible network interface including the Dialog SmartServer IoT and the Dialog U10, U20, U60, or U70 USB network interfaces.


You can verify that you have Release 4.5 by starting IzoT CT, clicking the IzoT CT icon in the top-left corner of the Echelon IzoT CT Design Manager, and then clicking About Echelon IzoT CT.  The About Echelon IzoT CT Design Manager dialog appears.  This dialog displays the version number of your IzoT CT software.

The “IzoT CT” name is the name of the OpenLNS CT software starting with Release 4.1.  The following table summarizes the OpenLNS CT releases:


Version Number


OpenLNS CT 4.0


January 2013

IzoT CT 4.1


March 2018

IzoT CT 4.3


July 2019

IzoT CT 4.4


March 2020

IzoT CT 4.5


August 2021



IzoT CT 4.5 removes the requirement to run IzoT CT as an administrator with a Click-to-Run version of Visio.


Following are warnings for IzoT CT.

Visio Macro Problems

Macros Disabled in IzoT CT Drawings Created with the LonMaker Tool

If you open an IzoT CT drawing originally created with the LonMaker tool, Visio may display message the following error message: “Macros in this document are disabled because the security level is high…”  If you click OK, the drawing opens, but most of the IzoT CT functionality is disabled.  Workaround: To enable the IzoT CT software to work with a drawing created with the LonMaker tool, use the following steps to decrease Visio's macro security.

1.      Open the Tools menu.

2.      Click Options, select the Security tab, and then click Macro Security.  A dialog appears allowing you to select Low, Medium, High, or Very High security.

3.      Select Low or Medium security.  If you select Low security, you will be able to open the drawing without a prompt.  If you select Medium security, you will be prompted to enable macros for unsigned network drawings or network drawings signed by companies that have not been added to the trusted signatures list.  

Visio's security level is persistent.  When you change Visio's security level, it will be the security level for Visio every time it is started until you change it again.  Alternatively, you can apply your own company's digital signature to any IzoT CT drawings to disable macro warnings for those drawings.  For detailed instruction on how to do this, go to support.microsoft.com.  (40186)

Extra Visio Drawings Opened

When you open an IzoT CT document, more than one instance of the document may open in Visio, or additional documents may be opened at the same time.  Workaround: To prevent opening extra drawings, follow these steps:

1.      On the Visio Add-Ins menu (the LonMaker menu in Visio 2003), click Synchronization/Resynchronize.

2.      Select Reset Visio Workspaces.

3.      Click Next.

4.      Select either Only the Current Drawing to update the workspace for the current drawing only, or All Drawing Files in the Network to update the workspace for all drawing files.  (40066)

Windows Reports Visio has Failed after Closing an IzoT CT Drawing

When you close an IzoT CT document, Windows may infrequently report that Visio has stopped responding after closing the IzoT CT drawing.  Workaround: This problem occurs after the IzoT CT add-in has properly closed the IzoT database and the Visio drawings and then terminated.  As a result, the IzoT CT drawing and IzoT Net Server database are not corrupted, and you can safely close and ignore the error message.  (56976)

IzoT CT Menus not Displayed in Visio

If automation events have been disabled in Visio, the IzoT CT menus may not be displayed in Visio.  Workaround:  To display the IzoT CT menus, follow these steps:

1.       In Visio, click the File tab, and then click Options (on left side).  The Visio Options dialog opens.

2.       In the Visio Options dialog, click Advanced (on left side of dialog)

3.       On the right side of the dialog, scroll to the bottom, and verify that Enable Automation Events is selected under the General heading.

4.       Click OK.  (63602)

IzoT CT Design Manager Problems

Options not Displayed in the IzoT CT Default Options Tab 

If you press the ENTER key on the IzoT CT Default Options tab, the displayed options will disappear.  Workaround: Either re-select the category or click a different tab in the OpenLNS Design Manager and then re-click the IzoT CT Default Options tab.  (41369)

Different User Account Error

If you use IzoT CT from a different user account than the one used to install the IzoT CT software, the following error message may appear when you initially open or create a network: “Cannot start IzoT CT.  If you have run Visio directly, please instead run IzoT CT Design Manager…”.  Workaround: Exit Visio, exit and restart the IzoT CT Design Manager, and then re-open (or re-create) the network.  If the problem persists, reset the Visio workspaces as described in Corrupted Visio Macro Security Settings.  (23900)

Bottom of Dialog is not Visible

In some cases, the bottom edge of the IzoT CT Design Manager dialog may be clipped. Workaround: Go to the IzoT CT Default Options tab, and select the IzoT CT font category. Change the Dialog height factor (for example, if it is 1, change it to 1.1). Close the IzoT CT Design Manager, then restart and repeat the process, restoring the original Dialog height factor value.  (64882)

Imported LonMaker Databases Stored in Different Folders

If you import a network created with the LonMaker tool into IzoT CT, the folders in which the drawings and databases are stored may be different. IzoT CT stores the drawings and databases in the C:\Users\Public\Documents\LonWorks\OpenLnsCt folder by default; the LonMaker tool stored the drawings and databases in the C:\LM folder. Workaround: In the General tab of the IzoT CT Design Manager, change the selected folder in the Drawing base path field to select whether the IzoT CT Design Manager lists the IzoT CT networks or the LonMaker networks.  (63419)

IzoT CT Drawing Problems

Reference Connection Locations Not Synchronized

If you move a reference connection in one IzoT CT client, other IzoT CT clients will not be updated with the new location of the reference shape. Workaround: Replicate the drawing update in all instances of IzoT CT, or use the auto-alignment feature.

Database Access Error

If the IzoT Net Server does not have read/write access to the folder containing an IzoT CT database, you may receive an LCA #22 [DB Access Error #-2032] error message when trying to open that database Workaround: Use the Windows File Manager to browse to the folder containing the network database, which is C:\Users\Public\Documents\LonWorks\OpenLnsCt\Databases\<network name> by default, right-click the folder, and select Properties. Click the Security tab, and then add or edit an entry for “Everyone” with Modify permission.  (67626)

Subsystem Names with Ampersands

If you perform a network merge and the source network contains a subsystem (Visio page) with an ampersand character (&) in its name, IzoT CT may report an unexpected error or Visio may fail. Workaround: Remove ampersands from all subsystem names.  (51231)

Invalid RNI Names in Restored Networks

If you back up a network that uses a remote network interface (RNI) and restore it on a different computer, the name of the default network interface for the restored network will be the RNI even if it has not been defined on the current computer (or if the RNI is defined, but references a different device). Workaround: Use the LonWorks Interfaces application in the Control Panel to create an entry for the correct RNI, and then select that RNI when opening the network.  (47073)

Cannot use Accelerator Keys

You cannot use the Accelerator keys to access the IzoT CT menu items in the Visio 2010 Add-Ins tab. Workaround: Use the mouse to access the IzoT CT menus.  (57703)

Recovery does not Place Devices in Top-Level Subsystem

If you recover a network, some of the devices in the top-level subsystem may be recovered to a subsystem named “Subsystem 5”, which is not the top-level subsystem.  Workaround:  Move the devices and functional blocks from Subsystem 5 to the top-level subsystem as described in Changing the Subsystem for an IzoT CT Shape in the IzoT CT User’s Guide.  (41815)

IzoT CT Help Closes with IzoT CT Browser

If you open both the IzoT CT help and the IzoT CT Browser and then close the IzoT CT Browser, the IzoT CT help file also closes. Workaround: Do not close the IzoT CT Browser if you want to continue using the IzoT CT help file, or re-open the IzoT CT help after closing the IzoT CT Browser.  (39570)

Names with Multi-byte Characters

The IzoT CT tool and some plug-ins may fail if devices, functional blocks, or network variables have multi-byte character names.  Workaround: Change the name of the object in the IzoT CT drawing and then restart the plug-in.  If that does not correct the problem, do not use a multi-byte character name.  (41701)


Dialog, Adesto, Echelon, LON, the Dialog logo, the Adesto logo, the Echelon logo, LonWorks, NodeBuilder, LonTalk, LonPoint, Neuron, 3120, 3150, LNS, i.LON, ShortStack, LonMaker, IzoT, OpenLDV, LonScanner, and LonBridge are trademarks of Dialog Corporation that may be registered in the United States and other countries.  For a complete list of registered trademarks see the Dialog web site at www.dialog-semiconductor.com.  All rights reserved.

Other trademarks belong to their respective holders.