User guide

eWON 500-2001-4001-4002 User Guide - Export Block Descriptors
eWON 500®2001®4001®4002® Version 4_3_0 - User Guide - 10/5/05 - ©ACT'L sa - Page 195
11.2.3 $st [Start Time] and $et [End Time]
These 2 fields are used to limit the time range of an export operation. $st and $et provide the start and end time of the export.
The parameter format is the same for both fields.
There are 3 different formats for the $st, $et parameter:
• Relative time
• Absolute time
• From last $ut (see also “$ut [Update Time]” on page 196).
11.2.3.1 $st, $et with relative time
Syntax:
$st_([s]|[m]|[h]|[d])100 _ = back
(h,m,s,d = Hour, min, sec, day. 100 is the amount)
This represents a time relative to the current time expressed in days, hour, minutes or seconds.
If no letter is specified minutes are considered.
Examples:
11.2.3.2 $st, $et with absolute time
Syntax:
$stDDMMYYYY[[_HHMMSS][[_mmm][[_I][[_T]]]]]
Where:
When ALL Tags are specified, Tag values are output in chronological order.
For the same time there can be 2 Tag values.
In order to reposition correctly in the file, it is necessary to provide the last Tag output during a previous export.
Examples:
$st_m10 10 minutes in the past
$et_0 0 minutes in the past (= now)
$st_d2 2 days in the past
Table 113: $st with relative time examples
DDMMYYYY Means Day, Month, Year, 8 characters. This parameter is required.
HHMMSS Means Hour, Minute, Second, 6 characters. This parameter is optional (0 used by default)
mmm
Means milliseconds (000 to 999) 3 characters.
This parameter is optional but if present, HHMMSS must also be specified.
I
Means intra sec counter. This value is present when receiving an historical logging from the eWON.
It can be specified in export request to allow precise repositioning in the historical file.
This parameter is optional, but if present, HHMMSS and mmm must also be specified.
T
Means Tag id. As for I, this parameter is used for precise positioning in historical file.
The parameters is optional, but if specified, HHMMSS, mmm and I must be present also.
Table 114: $st parameters
$st01012000_120000 1 jan 2000 at 12 AM
$st01012000_120000_010 1 jan 2000 at 12 AM + 10 msec
Table 115: $st with absolute time examples