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COMMERCIAL CARBON DIOXIDE SENSOR, 400 PPM TO
2000 PPM (UP TO 10000 PPM EXTENDED RANGE),
8.1.7
Read Memory Map Version
Master Transmit:
<FE> <04> <00> <0B> <00> <01> <54 > <07>
Slave Reply:
<FE> <04> <02>
<41> <01>
Data Explain:
<41> <01> is valid data 0x4101, it indicates memory map version.
8.1.8
Read FW Version Main and Sub.
Master Transmit:
<FE> <04> <00> <0C> <00> <01> <E5 > <C6>
Slave Reply:
<FE> <04> <02>
<01> <00>
Data Explain:
<01> <00> is valid data 0x0100, IR13 high byte is FW Main revision, low byte – FW Sub revision. So this version of FW is 1.0
8.1.9
Read Sensor ID
Master Transmit:
<FE> <04> <00> <0D> <00> <02> <F4 > <07>
Slave Reply:
<FE> <04> <04>
<11> <03> <30> <33>
Data Explain:
<11> <03> <30> <33>is valid data 0x11033033, it means sensor ID.
8.1.10 Read Serial Number
Master Transmit:
<FE> <04> <00> <0F> <00> <05> <14 > <05>
Slave Reply:
<FE> <04> <0A>
<53> <43> <30> <37> <31> <31>
Data Explain:
<53> <43> <30> <37> <31> <31> <30><33><30><33> is valid data 0x53433037313130333033. After conversion to ASCII, it
is SC07110303.
8.2
Holding Registers Description
Values are read and written from IR using "Read holding registers" (function code 03).
8.2.1
Setup ABC Period
Master Transmit:
<FE> <06> <00> <04>
<00> <B4>
Slave Reply:
<FE> <06> <00> <04> <00> <B4> <DC > <73>
Data Explain:
<00> <B4> is valid data 0x00B4, decimal is 180. It means ABC calibration (a program for automatic calibration) is
performed every 180 hours. The value range is (4, 4800) hours and should be an integer multiple of 4. When the value is 0,
this function is disabled.
8.2.2
Read ABC Period
Master Transmit:
<FE> <03> <00> <04> <00> <01> <D1 > <C4>
Slave Reply:
<FE> <03> <02>
<00> <B4>
Data Explain:
<00> <B4> is valid data 0x00B4, decimal is 180 hours.
10 Sensing and Internet of Things
<5C> <B4>
<AC> <B4>
<55> <A2>
<30><33><30><33><C4><D6>
<DC > <73>
<AC> <27>
CRIR M1
Issue 1
000842
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