IR command for full shutdown?

Hi there,

I have a U1 and an A2 Lite controller. I know a short press of the power button on the A2 Lite will put the unit into sleep mode but I want to use a Harmony remote to shut it down fully. Is there a single IR command that will trigger a full shutdown? I know a long press of the power button will bring up a shutdown menu but that doesn't work too well with the Harmony.

Am I missing something obvious?

Ta