SmarTek Systems SAS-1 Setup Using SAS Monitor - Manual (Page 19)

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operation. The archive storage is circular so that when the archive grows to the maximum size,
the oldest measurement data is discarded to make room for the most recent.
The SAS-1 will collect traffic flow data for all 5 lanes and update the archive as specified by the
Update Period parameter in the Archive Header File (5, 10, 15, 20, 30, or 60 minutes).
After sending a header file to the SAS-1 or setting the SAS-1 date and time, data archiving
begins after the next full data write period. For example, let the archive period be set at 15
minutes and the Set Date and Time command be sent to the SAS-1 at 1:01:55 PM. The
first archive record would be captured at 1:30:00 PM (data from 1:15 to 1:30) and the
SAS-1 would write the archive records at 2:15:00 PM. The SAS-1 captures 4 intervals of
data before writing the data to non-volatile flash memory. The time stamp for each written
record corresponds to the end of the data interval.
Retrieving the Archive Data from the SAS-1
To retrieve the archive data from the SAS-1, click the Sensor/Get SAS Archive Data menu
item. The progress of the retrieval process is shown in the status line at the lower left area of the
SAS Monitor and Setup main display. If the process is not sucessful, the Start/Stop button will
show “Stop”. Click the Stop button and retry by clicking the Sensor/Get SAS Archive Data
menu item.
The downloaded archive data is stored in the \Arch_Data\ sub-folder with the filename specified
in the Archive Header File (.hhx) and a date and time stamp prefix as follows:
yyyymmdd_ hhmmss_Archive0.ahx
Converting the Archive Data from the SAS-1 to Another Format
Convert To Field
Files for Conversion Select Files for Conversion
Figure 10 SAS-1 Archive Data File Conversion