Sorry for the delay.  Lol this is early for me actually as most of the time I'm checking in later in the evening.  Yes, unfortunately without upgrading your array to Naviphere Manager, you won't be able to run navicli commands against the AX150.  It wasn't until the AX4-5 series where a subset of commands was supported with Navisphere Express running.
I have an AX150 that i would like to get to using navicli/naviseccli, regardless of what command i issue to SP i get an error message:  NaviCLI.exe -h ax150.mycompany.local getall  Error: getall command failed Command not Supported This command is not supported on this subsystem type.  The only reason i can think of this is not working is because this box is running Navisphere Express and needs to be upgraded to full version of Navisphere Manager. Can somebody confirm ?  Thanks
Managing AX150 using navicli