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8.7 Compute Module menu  Service Menu  Shutdown Signal

Available options: Enable / Disable

Enables or disables the use of GPIO 23 to signal that power to the compute module will be shutting down.

Note that a monitoring utility must be installed to watch the GPIO 23 shutdown signal and shut down the

operating system accordingly.

8.8 Compute Module menu  Service Menu  Shutdown Signal 

Power Supply Off Delay

For use only when the Shutdown Signal is set to Enable. This sets the time delay after the Shutdown

Signal is set until the power to the Compute Module is turned off. Configure this to allow adequate time

for any software to shutdown safely. Note that a monitoring utility must be installed to watch the GPIO 23

shutdown signal.

8.9 Compute Module menu  Service Menu  WDT

Available options: Enable / Disable

Enables or Disables the display’s built in Watchdog Timer function for the Compute Module.

When set to Enable, the display will expect to receive a periodic reset command from the Compute

Module via the internal UART. If the command isn’t received for two consecutive timeout periods, the

display will restart the Compute Module.

This feature can be used to automatically reset the Compute Module if the CPU hangs for some reason.

The following two settings control the timeout periods: Start Up Time, Period Time

The Python SDK includes sample functions to send the periodic reset command. However, it is up to the

developer to configure the system to make sure this runs as the Compute Module starts and continues to

periodically send the reset command. See Python Based NEC PD SDK on page 63.

See section 7.11 for more details on using this feature.

These models require display firmware version R1.006E or later for this feature: P404, P484, P554, V404, V484,

V554, V404-T, V484-T, V554-T

NEC C751Q User Manual

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