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COMMERCIAL CARBON DIOXIDE SENSOR, 400 PPM TO
2000 PPM (UP TO 5000 PPM EXTENDED RANGE),
TABLE 7. HOLDING REGISTERS DEFINITION
HR#
#
NAME
HR1
0
—
HR2
1
—
HR3
2
—
HR4
3
—
HR5
4
ABC Period
HR6
5
User Acknowledgement Register
HR7
6
User Special Command Register
HR8
7
User Concentration
HR9
8
—
HR10
9
—
HR11
10
—
HR12
11
—
HR13
12
—
HR14
13
—
HR15
14
—
HR16
15
—
HR17
16
—
HR18
17
—
HR19
18
—
HR20
19
—
HR21
20
—
HR22
21
—
HR23
22
—
HR24
23
—
HR25
24
—
HR26
25
—
HR27
26
—
HR28
27
—
HR29
28
—
HR30
29
—
HR31
30
—
HR32
31
—
1
Writing ABC_Period zero value suspends ABC function, but ABC samples and ABC time counting do not lose. To resume ABC function with prior
ABC samples and ABC time, write ABC_Period non-zero values.
Reserved CIs returns 0.
2
3
Special Command Register is write-only.
8 Sensing and Internet of Things
DESCRIPTION
Reserved
Reserved
Reserved
Reserved
ABC period in hours
CI 1 - CO
random calibration point has been performed 0X0000
2
CI 2 - Reserved
2
CI 3 - Reserved
2
CI 4 - Reserved
2
CI 5 - Reserved
2
CI 6 - Reserved
2
CI 7 - Reserved
2
CI 8 - Reserved
2
CI 9 - Reserved
2
CI 10 - Reserved
2
CI 11 - Reserved
2
CI 12 - Reserved
2
CI 13 - Reserved
2
CI 14 - Reserved
2
CI 15 - Reserved
2
CI 16 - Reserved
2
Command
3
0x7C
User concentration (default: 400 ppm)
Reserved, returns "illegal data address" exception
Reserved, returns "illegal data address" exception
Reserved, returns "illegal data address" exception
Reserved, returns "illegal data address" exception
Reserved, returns "illegal data address" exception
Reserved, returns "illegal data address" exception
Reserved, returns "illegal data address" exception
Reserved, returns "illegal data address" exception
Reserved, returns "illegal data address" exception
Reserved, returns "illegal data address" exception
Reserved, returns "illegal data address" exception
Reserved, returns "illegal data address" exception
Reserved, returns "illegal data address" exception
Reserved, returns "illegal data address" exception
Reserved, returns "illegal data address" exception
Reserved, returns "illegal data address" exception
Reserved, returns "illegal data address" exception
Reserved, returns "illegal data address" exception
Reserved, returns "illegal data address" exception
Reserved, returns "illegal data address" exception
Reserved, returns "illegal data address" exception
Reserved
Reserved
Reserved
CRIR E1
, default: 180 hr
1
Parameter
0x1 - CO
random calibration
2
Issue 1
000841
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