700-SDI-PT-KEL-Man Rev 4 06 Jan 2020
15/19
Offset value for Temperature
The offset is always given in the selected unit. The internal transmitter lays it down in
C and then
converts to the selected unit.
Default value = 0.000
Offset value range = +/-2
C
If an offset outside of the range is programmed, an error occurs and the previous offset value is still
valid.
The offset is always given in the selected unit. The internal transducer lays it down in
C and then
converts to the selected unit.
The offset value for the temperature is saved in the EEPROM and can be read and changed with the
command:
Description
Command
Response
Read offset value for temperature TOB
aXZZTOB!
a<value><CR><LF>
Write offset value for temperature TOB
aXZZTOB<value>!
a<value><CR><LF>
Temperature Value
The internal transducer always reads in °C. It is only multiplied with the “unit”-factor and added with
its offset before it is given out over SDI-12 communication.
There are three different temperature units available to choose. They can be selected via a table
which is laid down in the internal EEPROM:
Number Pressure Unit
Factor
Offset
00
Factory
(1)
0
01
C
1
0
02
F
1.8001
32
03
K
1
273.15
Description
Command
Response
read temperature unit
aXT!
a0x<CR><LF>
write temperature unit
aXT0x!
a0x<CR><LF>
Continuous Mode
In continuous mode, the time interval and buffer size are defined. The buffer size defines the
number of pressure values that are stored. After the interval time elapses the sensor wakes up
from low power mode, takes a measurement, and then returns to low power mode. The pressure
values are buffered in a ring buffer and it is possible to read out the average value of this buffer
over an aR0! or aRC0! command.
8
Top of Bridge – method whereby temperature is derived using a Wheatstone bridge
