File : CS-SUP-MUTI-WTHERMAPP-E01.sxw
7.4 PARAMETER SETTING OF THE DATALOGGING MODE
The Datalogging mode enables periodic logging of temperatures at each input (by selecting the precision
index for PT100 and PT1000 probes). The frequency of these readings may be set in three modes:
index logging in time steps
index logging once a week
index logging once a month
When the storage table is full, the most recent measurements crush the oldest values , this mode is called
permanent loop
.
The standard datalloging doesn't support the 'Stop Memory Full' Capability. Thus, it cannot be enabled in the
Operating Mode
byte.
7.4.1 Description of the parameters used
According to the datalogging type ( time steps, once a week, once a month), some specific parameters must
be used.
Parameter
number
Description
Size
(in bytes)
Access
Right
Default value
0x01
Operating mode
1
R/W
Depending of the
module used
(see 6.1.5)
0x0C
Precision level of measurement
1
R/W
0x00
0x80
Measurement period (datalogging in time steps)
1
R/W
0x13
0x81
Start hour of the datalogging in time steps
1
R/W
0x08
0x82
Day of the week, or of the month
1
R/W
0x01
0x83
Time of measurement (datalogging once a week, or once a month)
1
R/W
0x08
These specific parameters must be initialized before activating the datalogging mode.
7.4.2 Precision level of the measurement
Compatibility : - WaveTherm – PT100
- WaveTherm – PT1000
Temperature measurement may be started with one of several precision levels (0 to 3). In general, precision
level 0 is sufficient. The other precision levels are used in difficult environments.
The aim of these precision levels is to compensate for measurement errors induced by the 50 Hz frequency.
In practice, this precision is increased by increasing the number of measurement sequences for the same
temperature. Each measurement sequence is offset in relation to the previous sequence by 50Hz.
WaveTherm modules – application handbook
page 41 of 65
