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©2019 NEC Display Solutions, Ltd. Page 43 of 74
8.12 Controlling the Compute Module cooling fan
By default, the cooling fan will turn on when power to the Compute Module is applied. A rotation sensor in
the fan will report an error to the display if the fan fails to rotate.
The option to control the fan is located in the OSD Expert menu and is available in the list of commands
that can be sent to the display via the internal UART or LAN.
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Direct control of the fan operation provides advanced functionality such as thermal control based on the
temperature of the Compute Module. The Python SDK includes a sample function to read the Compute
Module’s temperature sensor via the OS and control the fan based on the temperature levels measured.
This increases the lifetime of the fan itself and reduces noise levels by only running the fan when the
Compute Module temperature is higher than specified levels.
The Python SDK includes support for sending the cooling fan commands to the display. The example file
reset_display_wdt.py included in the SDK has support for thermal control based on the temperature
of the Compute Module. Temperature levels and other parameters can be configured in the file. See
Python Based NEC PD SDK on page 65.
See section 8.17 for details on configuring the Fan Power operation settings via the OSD.
Important: It is vital to keep the operating temperature of the Compute Module within safe operating
levels by using the cooling fan. Damage to the Compute Module could occur if it overheats.
8.13 Controlling the Compute Module power
Power to the Compute Module can be set to turn on automatically when the display power is turned on,
manually via the OSD, or manually via a command to the display. See sections 8.1 and 8.2 for details.
When the display power is turned off the Compute Module power can remain on, or automatically
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shut
down and turn off with the display. See section 8.18 for details.
Important: In order to avoid possible memory corruption it is highly recommended to use the
Shutdown Signal to gracefully shutdown the system. See section 7.8 for details.
8.14 Checking and updating the display firmware version
The display firmware version is displayed on the SYSTEM FIRMWARE menu on the OSD.
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These models require display firmware version R1.7 or later for this feature: C651Q, C751Q, C861Q, C981Q, P404,
P484, P554, P654Q, P754Q, V404, V484, V554, V404-T, V484-T, V554-T, V554Q, V654Q, V754Q, V864Q, V984Q
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