Xylem H-5223 - Manual (Page 36)

For example, if there are 574000 bytes free, and the unit is set to log Date, Time, Ana1,
Ana2, and Battery every 15 minutes, that would be 5 columns defined, or 5 data values per
scan.
(574000 * 15) / (5760 * 5) = 298.95 days.
If all memory was available:
(2159520 * 15) / (5760 * 5) = 1124 days or just over 3 years.
The value 5760 comes from 4 bytes per data value multiplied by 1440 minutes in a day.
File Count: There can be up to 8 files of data stored on H-5223. Each time scanning is
turned on it will open a new file. If there are already 8 files the user will be prompted to
erase a file or all the data. If power is lost and then restored, this will not start a new file but
continues to log data to the last file.
NOTE: Once the data memory is full the system will ‘wrap’ in the existing file only. If
only one file exists then the system will be able to use all the memory for
wrapping. If the system already has one or more files that take up 80% of the data
memory when scanning is turned on, then the new file will only have 20% of
memory available for the ‘wrap’ function. For this reason it is best to save and
then erase data on a regular basis.
T - Transmit Data
This option allows the user to select a file to transmit over the RS-232 port. After selecting
this option, a list of files will be displayed. Use the Up and Down Arrow keys to select the
file to transfer. Once the file is selected, the user must select if the file will be transferred
using a straight ASCII file dump or using the XMODEM file transfer protocol. The
XMODEM protocol reduces transfer errors, and should always be used at the higher baud
rates.
N - Transmit New Data
This option is used to transmit only the newest data starting at a point in time based on the
‘New Data Pointer’. The ‘New Data Pointer’ is normally pointing at the end of the last data
transfer of new data. The normal process is to use this command to transmit the new data,
then use the next command, ‘Reset New Data Pointer’ to position the pointer at the end of the
data just transferred so the next time data is sent it will be a continuation of data starting
where this transfer ended.
3-14 Remote Operation (Menu Mode)
H-5223