IAQ-CORE Datasheet, PDF (10/22 Pages) ams AG – The iAQ-Core sensor module is used to measure VOC levels

iAQ-Core − DetailedDescription
Figure 16:
Information Structure (Prediction)
Prediction
Byte0
Byte1
Byte2
Byte3
Byte4
Byte5
Byte6
Byte7
Byte8
The first two bytes contain the prediction value, which gives
the information about the indoor air quality. The value is a CO2
(ppm) equivalent and the calculation is shown in the following
example.
(EQ1)
Figure 17:
Information Structure (Status Flag)
Status Flag
Byte0
Byte1
Byte2
Byte3
Byte4
Byte5
Byte6
Byte7
Byte8
Figure 18:
Information Structure (Resistance)
The third byte indicates status of the module.
• 0x00: OK
• 0x01: BUSY
• 0x80: ERROR
If status is OK the data is valid. If the status is BUSY, the data
integrity is not guaranteed for variables of size > 8 bits, because
the module may be updating a part of the variable.
If the status is ERROR constantly (or very frequently) this
indicates that the module is reading non-realistic values, and
the sensor element is probably defective.
Resistance
Byte0
Byte1
Byte2
Byte3
Byte4
Byte5
Byte6
Byte7
Byte8
The next four bytes contain the sensor resistance in Ohm. Byte3
is always 0.
(EQ2)
Page 10
Document Feedback
ams Datasheet
[v1-00] 2015-Apr-30