The E36c cycles between zones every 20 minutes.
First 20 minutes: Top row of devices
Second 20 minutes: Middle row of devices
Third 20 minutes: Bottom row of devices
It will keep doing this as long as the cart is powered on.
When the cart is turned on, the cart will self-test its power strips by cycling each power strip sequentially for 10 seconds each. After the test is finished, the cart will begin running the cycle charging sequence.