Denso BHT-1400QWB-CE Software User Manual

Also see for BHT-1400BWB-CE: Hardware user manual

Contents

Denso BHT-1400QWB-CE Software User Manual Manual pdf 11 page image

- 3 -1.3. Usage Precaution Data backupNon-volatile memory (flash memory) is used to store user data for the BHT. Flash memory has a finite numberof program-erase cycles, therefore frequent access concentrated on the specific memory area may lead to dataloss.To optimize the Flash memory usage, the wear leveling function, which automatically distributes data evenlyover the flash memory, is implemented for the BHT.Nevertheless, backing up important data is strongly recommended in order to prepare for unexpected dataloss. Flash memoryFlash memory reaches the end of its lifetime as the number of writes increase. Application development mustfollow the restrictions listed below in order to prolong the flash memory lifetime.- Limit the data size written in the flash memory to maximum 100 M bytes per day.- Limit the write cycles to maximum 5,000 times per day for data smaller than 8 k bytes. RAM memoryAll data including files and settings stored in the RAM will be lost and the RAM will revert to the factory default;- If the BHT is left for a long period with the battery removed,- If the BHT is left with the dead battery,- If the battery is incorrectly replaced,- When Performing full reset. (Refer to "3.3 Reset and Full Reset")Back up any important data to the "Flash" folder or to the computer before full reset. The BHT performs a fullreset when the BHT turns ON after the data in the RAM is deleted.Using the backup and auto-setup tools provided by the BHT are recommended in order to reduce the risk ofdata loss. Refer to “2 Setup” for details of these tools. Ensuring stable operationsWindows CE may cause memory leaks when used over long periods.Resetting the BHT regularly utilizing the application created (once a day etc.) or as daily routine isrecommended for ensuring stable BHT operation.For example, call a reset task utilizing the application at the end of daily work or at scheduled update.Refer to the BHT API Reference Manual or the BHT Class Library Reference Manual for how to program areset task. SD cardThe microSD card will not be accessible for short periods of time when the BHT is turned OFF and back ONagain (or suspend and resumed) while the application is running.The application deployed in the microSD card may not continue the process correctly if the applicationaccesses the microSD card during these periods. Reset the BHT if the application freezes or the LED indicatorstays blue.To prevent the problem, copy the application to the built-in Flash memory before executing the application if theapplication is deployed in the microSD card, Application debugging using Windows Error ReportingEnable Error Reporting function in the Control panel when developing applications (recommended).Using Windows CE Dump Viewer in a host computer is also recommended in order to detect and solveapplication problems as early as possible.Refer to “5.2 Error Reporting” for details.