The main function of Data Logger Suite is logging data to a file (so-called, log file). The "Log rotation" tab has a rich set of options for it. (fig. 4.1.1).
Fig. 4.1.1 Log-file forming modes
First of all, select log file what you can configure:
Set the "Create log file on disk" option to checked state. Then you can set path to folder, where files will be created with the help of dialog window, which will be showed up after clicking a button with picture of opening folder. You should select a necessary folder in the dialog window and click the "OK" button.
Note: The program can work with network paths too, but in this mode, the program will increase data flow over a network and can be failed with exceptional errors.
A log file name can be stamped with date and time. In this case a new log file is created periodically. The time stamp format depends on the selected period. For instance, if the "File name prefix" field is set to "sample", the "File extension" field to "log" and the "File name format" option is "Daily", then each log file created will have the format "sampleYYYYMMDD.log". On March 21st, 2003, the log file will be "sample20030321.log". Please, note, that the final extension (after the final period), remains at the end of the file name.
Limit size - the "Limit size" field specify the maximum size in kilobytes of any log file. If you'll specify zero size, then the file size will not limited. You may select from the following modes:
If the program works continuous for a long time, it is possible that the log file will have large size and this file will be inconvenient for looking and analysing. For this there is the possibility to create files in dependence with the time on PC. You can select one variant predefined or set up new one:
Date and time formatting codes:
d - day, not adding null(1-31).
dd - day ,adding null(01-31).
ddd - day of the week in text form(Mon-Sat) according to standard, set on this computer.
dddd - day of the week in full text form(Monday-Saturday) according to standard, set on this computer.
m - month, not adding null(1-12).
mm - month, adding null (01-12).
mmm - month in text form(Jan-Dec) according to standard, set on this computer.
mmmm - month in full text form (January- December) according to standard, set on this computer.
yy - year in the form of two last digits(00-99)
yyyy - year in the form of four last digits (0000-9999).
h - hours, not adding null (0-23).
hh - hours, adding null (00-23).
n - minutes, not adding null (0-59)
nn - minutes, adding null (00-59).
s - seconds, not adding null (0-59).
ss - seconds, adding null (00-59).
Example: you want to create log file every hour. It is desired that file name starts from "sample_log" and the file extension "txt".
Answer: set file prefix = sample_log_, file extension= txt (without dot!). In file name format show HHDDMMYYYY. Now file will be created every hour. Naturally, you can set any formatting characters combination, described higher.
If you want to access to a log file while the program work, then you should configure access mode settings for the log file in the next chapter.
Add date/time stamp to file name - this option is available for modes #4 and #7 and allows to add date and time to the file name.
Add data source ID to file name - if this options is activated then then the program will append the data source name at the beginning of the file name. For example, COM1-sample20030321.log.
Write data/time stamp to file before writing data - if this options is activated then then the program will write a date/time stamp to a file before each data portion.
Overwrite existing files - this option is available for modes #4 and #7 and allows to delete an existing log file before creating a new log file.