A Just Add Power Receiver keeps track of whether the connected display is powered on or off. Essentially, the Receiver is looking for an active HDMI connection to a display.

Telnet into a Receiver and send this command:

cat /sys/devices/platform/display/monitor_info | grep "attached=y" -c

Responses:

• 0 = The display is off, or the HDMI cable from the Receiver to the display is disconnected
• 1 = The display is on.