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Appendix A: Waking the Panel via PoE
Overview
This section describes a power saving feature designed into the non-POE versions of the ModeroX G5 line of touch panels, including
the MXD/T-1901 and MXD/T-2001 Surface/Wall Mount touch panels, as well as MXR-1001 10.1" Retractable Touch Panels.
Traditionally, in order to wake a panel from shutdown, the user would need to press the user button, which meant they had to be
physically located at the panel. This feature would allow one to remotely cycle POE power to the panel's Ethernet port in order to
wake it. Since the panels have always had a way to remotely shut them down, this new feature now allows a remote start up. Power
management could be programmed into the master to, for example, shutdown the panels at the end of the day, and then wake them
up again the next morning without human intervention.
Detail Description
ModeroX G5 panels feature a hardware design that will recognize POE power and wake a panel from shutdown.
NOTE: Since these panels do not actually use POE power, it is recommended that if attached to a POE port, the port is conf igured to
normally disable POE power.
When it comes time to wake the panel, the POE switched is accessed and POE power to the port is turned on just long enough to
wake the panel, and then turned off. Depending on the switch, the cycle time could be as little as three or four seconds. A test
should be conducted to determine the minimum dwell time to leave POE power enabled in order to reliably wake the panel.
10" Retractable Panel Limitations
The 10" retractable panel has the wake up circuit on both the spare and signal pairs. Additionally, it also includes a load resistor
that will draw enough power on the POE in order to prevent POE cycling. As a consequence, if POE power were to be kept enabled
while the panel was running or shutdown, the POE port could draw up to 1 watt of power continually.
It is for this reason that it is it is recommended to have power disabled normally, but then turn it on for only a few seconds in order
to wake the panel.
Noteworthy POE Switch Interactions
In one installation, panels were installed on POE switches with the POE power enabled for their ports, which resulted in cycling due
to insufficient POE load. This particular switch would not route packets to a port which was a recognized POE device but which had
no power applied. As a consequence, when power would cycle on, packets were routed to the port, but then when the POE power
was removed due to insufficient POE load, packet would no longer be routed to that port.
The result would be that the panel would continually drop off line and then back on line as the POE power cycled. After
recommending that the POE power be disabled to the port feeding the panel, the problem went away.
MXR-1001- Installation & Hardware Reference Manual
Appendix A: Waking the Panel via PoE
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