Campbell Scientific CR3000 CR3000 Micrologger - Page 274
TableFile with Option 64, 8.20.2 TableFile with Option 64 Replaces CardOut, 8.20.3 TableFile
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Section 7. Installation 7.8.20.1 TableFile() with Option 64 Option 64 has been added as a format option for the CRBasic instruction TableFile(). It combines the speed and efficiency of the CardOut() instruction with the flexibility of the TableFile() instruction. CF cards up to 16 GB are supported. TableFile() with Option 64, TOB3 is now available in CR3000 operating systems 25 or greater. TableFile() is a CRBasic instruction that creates a file from a data table in datalogger CPU memory. Option 64 directs that the file be written in TOB3 format exclusively to the CRD: drive1. Syntax for the TableFile() instruction is as follows: TableFile(FileName, Option, MaxFiles, NumRecs/ TimeIntoInterval, Interval, Units, OutStat, LastFileName) where Option is given the argument of 64. Refer to CRBasic Editor Help2 for a detailed description of each parameter. Note The CRD: drive (the drive designation for the optional CF card) is the only drive that is allowed for use with Option 64. Note Larger cards are primarily intended for storing high-frequency data in applications wherein storage cards are changed out frequently. Large cards may also be used in applications where the site cannot be accessed for extended periods. However, large CF cards do not eliminate the risk of data loss. 1The CRD: drive is a memory drive created when a CF card is connected to the datalogger through the appropriate peripheral device. The CR3000 is adapted for CF use by addition of the NL115 or CFM100 modules. NL115 and CFM100 modules are available at additional cost from Campbell Scientific. 2CRBasic Editor is included in Campbell Scientific datalogger support software suites LoggerNet, PC400, and RTDAQ. 7.8.20.2 TableFile() with Option 64 Replaces CardOut() TableFile() with Option 64 has several advantages over CardOut() when used in most applications. These include: • Allowing multiple small files to be written from the same data table so that storage for a single table can exceed 2 GB. TableFile() controls the size of its output files through the NumRecs, TimeIntoInterval, and Interval parameters. • Faster compile times when small file sizes are specified. • Easy retrieval of closed files via File Control (p. 456) utility, FTP, or E-mail. 7.8.20.3 TableFile() with Option 64 Programming As shown in the following CRBasic code segment, the TableFile() instruction must be placed inside a DataTable() / EndTable declaration. The TableFile() instruction writes data to the CF card based on user-specified parameters that determine the file size based on number of records to store, or an interval over which to store data. The resulting file is saved with a suffix of X.dat, where X is a number that is incremented each time a new file is written. 274