Fatal errors

When the system encounters a fatal error, the error is reported to the terminal immediately in the following format:

*FATAL ERROR Ennn: Explanation

"nnn" is a three-digit error reference number.

“Explanation” describes the error.

When a fatal error has occurred the CLI will only respond to <ETX> and <CR>. If either of these are received, then the system will enter boot mode. If <ETX> or <CR> are not received within the watchdog timeout period (approximately 9 seconds) then the system will reboot.

Important

If a fatal error occurs whilst a command is sending a <ETX> or ENTER character to the hub, then boot mode will be entered. If the product enters boot mode then you will need to send the reboot command to return to normal operation.

Boot mode is indicated by receiving the below response (sent on a new line)

boot>>

In boot mode, non-bootloader commands will be responded to with:

*E900: Invalid bootloader command

For testing purposes, boot mode can be entered by using the boot command.