The device is busy processing a reset operation. The reset can have been requested (with a SETDEVICE instruction) by another program task that is accessing the device or the device can have initiated the reset on its own. Use software interlocks to prevent a second program task from accessing the device after a reset operation has been requested. (Note that the requesting SETDEVICE instruction waits for the reset to complete.) Refer to the documentation for the specific device for information on its self-generated resets.