Perform the following for each controller to be downgraded, and for which you have secured
NiagaraAX license.
Prerequisites: To restore an existing station, make sure you have access to the station file, or a backup distribution file.
- At the
Supervisor, using
Workbench, open a platform connection to the controller to be downgraded, then open the Application Director and stop any running station.
- With the platform still selected, choose the Distribution File Installer from the view selector, navigate to the location of the downgrade distribution file, and click Conversion.
NOTE: Some non-applicable files, such as
N4 cleanDist, .dist or other files may be selectable but, in this case, do not select these files. Click the Choose Directory button to browse to the location of the downgrade .dist file, for example: N4toAX-qnx-jace-<npm-model>etfs2048-clean.dist.
- Select the appropriate
.dist file and click the Install button.
NOTE: Installation clears all data in the controller, including
AX licenses and certificates, environment and properties files, SSL certificates and key files, along with all station data
and software. The controller’s IP configuration is retained. You must use the default platform credentials to regain access.
- After this
.dist file installs and the controller reboots, re-open a platform connection using
Workbench (port 3011) and the factory default credentials.
NOTE: At this point, the JACE will be at 3.8.38 version. If you need an earlier release
AX version, use the clean .dist files in the
AX-3.8 Distribution File Installer. This will revert the JACE back to the base-factory version.
- Run the platform Commissioning Wizard (right-click the Platform node, and select Commissioning Wizard). During the commissioning process you can choose to reinstall a station, if you have one ready, perhaps from a previous
backup, or you can restore from a backup as described in the next step.
CAUTION: Do not remove power from the controller during this reboot, which may take up to 7 or more minutes. Removing power could cause
the unit to become unrecoverable. If desired (and convenient), you can use a serial shell connection to the controller to monitor progress as files are installed,
the platform is rebooted, and the unit is prepared.
For more details on commissioning the
AX-3.8 controller, see the JACE Niagara 4 Install and Startup Guide.
- If you did not restore a station with the previous commissioning step, make sure you have a backup
.dist file and a platform connection to the rebooted
AX-3.8 controller. Select the Distribution File Installer view and click on the Backups button or Choose Directory button to navigate to the appropriate dist file location.
- Select the
.dist file and click the Install button. Follow the prompts in the Distribution File Installer to complete the installation.