Keysight M9036A PXIe Embedded Controller User Guide 33
Chassis shutdown Using the Controller
Chassis and INHIBIT switch
The Keysight chassis has an INHIBIT switch on the rear panel. It controls whether
the M9036A controller or the Inhibit signal on the rear panel DB-9 connector is
allowed to turn the chassis power on/off. The default (DEF) switch setting allows
the M9036A controller to control chassis power.
For more information, refer to the chassis documentation.
Default Position
If the INHIBIT switch is set to the DEFault position and the chassis is powered up,
momentarily pressing the chassis front panel ON button will cause a clean shut
down of the M9036A followed by the chassis powering down. The next press of
the chassis ON button initiates the standard power up process.
Pressing the ON button for greater than 5 seconds causes a forced shut down of
Windows followed by the chassis powering down. The next press of the chassis
ON button initiates the power up process where the chassis will be powered up
and then the M9036A brings up Windows. However, Windows safe mode may be
displayed in this situation because of the forced shut down of Windows.
Manual Position
Set the rear panel INHIBIT switch to the MANual position if you want to remotely
control the chassis power using the Inhibit signal on the rear panel DB-9
connector. A high (or open circuit) on the Inhibit signal powers up the chassis
while a low on the Inhibit signal powers down the chassis. Applying a low on the
Inhibit signal powers down the chassis and the M9036A simultaneously - that is,
without shutting down Windows first. This may leave Windows in an unknown
state. Therefore always shut down Windows prior to powering down the chassis
using the Inhibit signal.
To avoid leaving Windows in an unknown state, the front panel ON button can be
used with the rear panel Inhibit signal. In this situation, however, the chassis
power is no longer completely controlled remotely, and local interaction is
required.
If the chassis and M9036A are powered up, momentarily pressing the ON button
causes an orderly shutdown of the M9036A, but the chassis remains powered
and the M9036A System Status LED HS (Blue) remains on. At this point, you
have two options:
- Momentarily press the ON button again to turn on the M9036A and bring up
Windows.
- Complete the power down process by grounding the Inhibit signal (pin 5 of
the rear panel DB-9 connector).
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