User Manual EE895
Miniature Sensor Module for CO
2
, Temperature and Barometric Pressure | 15
The measured data is available as a 16 bit integer and is expressed in SI units:
Measurand
Register pointer
Unit
Scale
CO
2
average, pc
1)
0x00
ppm
1:1
T
0x02
°C
1:100 *
)
p
0x06
mbar
1:10 **
)
CO
2
average, npc
2)
0x08
ppm
1:1
CO
2
raw, pc
1)
0x0A
ppm
1:1
CO
2
raw, npc
2)
0x0C
ppm
1:1
1) pc ... pressure compensated
2) npc ... not pressure compensated
*) Example: 2 575 means 25.75 °C
**) Example: 10 130 means 1 013 mbar
Tab. 7
Data availability from the EE895 Miniature Sensor Module
Example for reading all measurands (7-bit address shifted):
EE895
Request [Hex]: S BC 00 P
Start
Slave address
7-bit shifted
Register
pointer
Stop
S
BC
00
P
Response [Hex]: S BD 03 B0 0A B7 8D 00 26 70 P
Start
Slave address
7-bit shifted
CO
2
high byte
CO
2
low byte
T
high byte
T
low byte
res.*)
high byte
res.*)
low byte
p
high byte
p
low byte
Stop
S
BD
03
B0
0A
B7
80
00
26
70
P
*) Reserved for future use
Conversion:
Measurand
Response [Hex]
Response [Dec]
Value
CO
2
0x03B0
944
944 ppm
T
0x0AB7
2743
27.43 °C
p
0x2670
9840
984.0 mbar
Tab. 8
Interpretation of data from the response
