KCS530 Infrared CO2 Module
KCS530 is a gas detection module based on the principle of NDIR
infrared absorption, which is suitable for detecting the
concentration of carbon dioxide in a gaseous environment at room
temperature.
KCS530 adopts a patented optical cavity, imported light source and
dual-channel detector to realize the reference compensation of dual
optical paths in space. KCS530 has good selectivity, no oxygen
dependence and long life.
KCS530 has UART, 485 output and 4-20mA current output (or analog
voltage output) for easy application selection; The KCS530 provides
zero point calibration, sensitivity calibration and clean air
calibration commands, and provides a manually calibrated MCDL pin
for customers to perform relative zero calibration of the sensor
module using outdoor free-flowing clean air.
KCS530 adopts convection diffusion ventilation mode, which has a
fast diffusion speed. KCS530 is designed for CO2 concentration
measurement in high humidity environments such as mushroom houses,
incubation rooms, and agricultural greenhouses. It can also be
widely used in HVAC fresh air control, indoor air quality
monitoring, agricultural and animal husbandry production process
monitoring, can be installed in intelligent buildings, ventilation
systems, robots, automobiles and other applications, can also be
applied to other narrow space air quality monitoring.
| parameter | symbol | minimum | Typical values | maximum | unit |
| Storage temperature | Tstg | -20 | - | 80 | °C |
| Operating temperature | TA | -20 | | 60 | °C |
| Operating humidity | HA | 0 | | 90 | % RH |
| Work pressure | PA | 0.8 | | 1.2 | atm |
| Supply voltage | Vs | 11 | 12 | 30 | V |
| Maximum operating current | Imax | 100 | 120 | 150 | mA |
Range (Customizable supported.) Can be up to 100% vol) | Ra | 0 | 5000 | 500000 | ppm |
| Resolution | Resolution | | 1000 | | ppm |
| Measurement accuracy | Accuracy | - | ± 20ppm or ±5% true value | ± 300ppm± 5% true value | ppm |
| T90 | diffusion | - | 20 | 40 | second |
| Repeatability | Zero | | | <±50 | | ppm |
| 50% FS | - | <±5% | <±5% of the measured value | - | |
| Life Span | | 3 | 10 | 15 | year |
Unit: mm
Diffusion
Pump-suction type
Signal output: analog current/voltage output, UART output, 485
output, users can need to customize.
Note: When the module is cold started, the concentration value
signal obtained within two minutes after power-on is not used as
the measurement basis.
Analog current output range (4mA~20mA), 4mA corresponds to 0ppm,
20mA corresponds to gas concentration at full scale. Customers can
also customize.
Analog voltage output range (0.4V~2.0V), 0.4V corresponds to 0ppm,
and 2.0V corresponds to the gas concentration at full scale.
Customers can also customize.
Baud rate: 9600bps, 8 data bits, 1 stop bit, no check bit;
The data is ASCII output, the number of data bytes per frame is not fixed, starting
with 32 and ending with rn
It is divided into proactive upload and Q&A2way.
4.2.1 The sensor actively uploads the concentration value, and the
data is output in the form of ASCII code, the format is as follows:
where 32 is the ASCII code for a space, and the output ends with a
newline character
For example: Output 12345 ppm format as follows:
| | 1 | 2 | 3 | 4 | 5 | | p | p | m |
| 0x20 | 0x20 | 0x31 | 0x32 | 0x33 | 0x34 | 0x35 | 0x20 | 0x70 | 0x70 | 0x6d |
4.2.2 Q&A (Choose one method for automatic upload and Q&A
output, the default is active upload)
Send decimal: 235237363521
return
where 32 is the ASCII code for a space, and the output ends with a
newline character
THREE PROTOCOLS ARE AVAILABLE: MODBUS RTU, MODBUS ASCII OR MODBUS
CUSTOMIZATION.
Host send protocol format
A protocol consists of fixed-format packets. The size of the packet
varies depending on the content of the packet.
| byte | content |
| 1 | Address of the communication unit (sensor address) |
| 2 | STX Character (0x23) |
| 3 | Message code 0x52 (read) or 0x53 (write). |
| 4 | Data length (packet length minus 6). |
| 5 | Data first |
| 6 | Second bit of data |
| 7... ....n-2 | Other data |
| n-1 | 0x21 |
| n | 8-digit check digit XOR |
The address of the first byte communication unit of the packet:
This refers to the address of the lower computer unit when the host
communicates with the lower computer. The second byte of the packet
is STX character, which is fixed. The third byte of the packet
indicates whether the packet is a read command or a write command.
0x52 is to read the command 0x53 write the command. The fourth byte
of a packet is the bit length describing the data contained in the
entire message, which is equal to the packet size minus 6. Data is
transferred sequentially from low byte to high byte. Text is routed
from left to right. Once all data has been transferred, the end of
the data will be indicated by 1 byte 0x21. The last byte of the
protocol is the checksum to verify the correctness of the
transmitted data.
The device returns the protocol format
A protocol consists of fixed-format packets. The size of the packet
varies depending on the content of the packet.
| byte | content |
| 1 | 06 (ACK, indicating that the host's command was received
correctly). |
| 2 | Address of the communication unit (sensor address) |
| 3 | STX Character (0x23) |
| 4 | Message code 0x52 (read) or 0x53 (write). |
| 5 | (packet length minus 7). |
| 6 | Data first |
| 7 | Second bit of data |
| 8... ....n-2 | Other data |
| n-1 | 0x21 |
| n | 8-digit check digit XOR |
Address of the communication unit: This refers to the address of
the lower computer unit when the host communicates with the lower
computer. The second byte of the packet is STX character, which is
fixed. The third byte of the packet indicates whether the packet is
a read command or a write command. 0x52 is to read the command 0x53
write the command. The fourth byte of a packet is the bit length
describing the data contained in the entire message, which is equal
to the packet size minus 6. Data is transferred sequentially from
low byte to high byte. Text is routed from left to right. Once all
data has been transferred, the end of the data will be indicated by
1 byte 0x21. The last byte of the protocol is the checksum to
verify the correctness of the transmitted data.
Command type
(1) Read the sensor concentration value: such as reading the current No. 32 (20H) sensor data
The host sends the command to the sensor: 20235201372146
20 23 52 01 37 21 ?? (decimal 16).
20: Sensor number
23: STX fixed
52: Read
01: Data length, indicating that there is 1 bit of data after it
37: Read sensor data
21: End
??: CheckSum check character
CheckSum= 20⊕23⊕52⊕01⊕37⊕21=46H, so?? =46H
The device will return the following data: 062023520537000003E821??
06 20 23 52 05 37 00 00 03 E8 21 ?? (decimal 16).
06: ACK is correct
20: Returns the sensor address
23: STX (0x23)
52: Service Type The default return operation type is (0x52) read
operation
05: Data Length The length of the data is 5 bytes
37: Command class
00 00 03 E8: The current CO2 concentration value, in PPM, is the
concentration value expressed in 4 bytes, with the high
concentration byte on the left and the low concentration byte on
the right, depending on the concentration of the sensor
21: Ending character
?? : CheckSum check character
CheckSum= 20⊕23⊕52⊕05⊕37⊕00⊕00⊕ 03⊕E8⊕21=?? XOR, excluding the
first byte 06
(2) Set the sensor address:
For example, read the current sensor address number 32 (20H) to
number 34 (22H).
The host sends the command to the sensor: 2023530231222160
20 23 53 02 31 22 21 ?? (decimal 16).
20: Current sensor number
23: STX fixed
53: Write
02: Data length, indicating that there are two digits of data after
it
31: Write address command
22: The current sensor address is changed to number 34
21: End
??: CheckSum check character
CheckSum= 20⊕23⊕53⊕02⊕31⊕22⊕21=60H, so ?? =60H
The device returns the following data: 062023530231222160
06 20 23 53 02 3122 21 ??
06: ACK is correct
20: Original sensor address
23: STX (0x23)
53: Service Type The default return operation type is (0x520) read
operation
02: Data Length Data length 2 bytes
31: Class command class
22: The current sensor address after changing the address
21: Ending character
??: CheckSum check character
CheckSum= 20⊕23⊕53⊕02⊕31⊕22⊕21=60H, so ?? =60H
(3) About setting the initial address of the sensor:
Short MCDL, zero calibration within 8 seconds, more than 10 seconds for the
initial address of the sensor The default is number 32. The factory
address of each sensor is set to 32 (20H), and when the user
modifies the sensor address, the corresponding forehead button must
be continuously held down for more than 10 seconds to restore the
address factory setting.
Host send protocol format
A protocol consists of fixed-format packets. The size of the packet
varies depending on the content of the packet.
| byte | content |
| 1 | Address of the communication unit (sensor address) |
| 2 | Function code |
| 3 | First place in the data area |
| 4 | Second digit in the data area |
| 5 | Third place in the data area |
| 6 | Fourth place in the data area |
| ...... . | Other data |
| n-1 | CRC low |
| n | CRC high |
Address of the communication unit: This refers to the address of
the lower computer unit when the host communicates with the lower
computer. The second byte of the packet indicates whether the
packet is a read command or a write command. 03 indicates that the
message is a read command, and 06 indicates that the message is a
write command. CRC is used for verification to verify the
correctness of transmitted data. Data is transferred sequentially
from low byte to high byte. Text is routed from left to right.
After all data is transmitted, the CRC check low and high bits will
end.
The device returns the protocol format
A protocol consists of fixed-format packets. The size of the packet
varies depending on the content of the packet.
Command type
(1) Read the sensor concentration value: such as reading the current sensor data No. 32 (20H).
The host sends a command to the sensor:
20 03 00 00 00 02 C2 BA
20: Current sensor address
03: Read the sensor concentration
00 00 00 02: Data area content
00 00 is address 00 02 is quantity
C2: CRC high
BA: CRC low
The basic principle of cyclic redundancy check code (CRC) is: after
the K bit information code, then splicing the R bit check code, the
entire coding length is N bits, therefore, this code is also called
(N, K code. For a given ( N,K ) code , it can be shown that there
exists a polynomial G(x) with a highest power of N-K = R. A
checksum of K-bit information can be generated from G(x), and G(x)
is called the generative polynomial of this CRC code. The specific
generation process of the check code is: assuming that the
information to be sent is represented by the polynomial C(X), shift
C(x) to the left by R bits (which can be expressed as C(x)*2R), and
so on To the right of C(x), the R bit will be free, which is the
position of the check digit. The remainder obtained by dividing
C(x)*2R to generate the polynomial G(x) is the check digit.
The device returns the following data:
If the total range is within 65536 ppm:
20 03 04 00 20 0B E8 CD 85 (decimal).
If the total range is greater than 65536 ppm:
20 03 06 00 20 00 00 0B E8 33 9D (decimal).
20: Current sensor address
03: Read the sensor concentration
04/06: Data area length (The length of the returned data area is
related to the total range ordered by the customer, if the maximum
range ordered by the customer is within 65536 ppm, then the
returned data area length is 04 (100ppm return number: 20 03 04 00 20 00 64 CB 10 ), if the maximum range is greater than 65536 ppm then the
returned data area length is 06 (100 ppm return number: 20 03 06 00 20 00 00 00 64 35 08)
The red part is the data bit, and the blue part is the data area
length
00 20 : Displays the current sensor address 0x20
0B E8: Displays the sensor gas concentration in PPM, the specific
value depends on the address and concentration of the sensor
The above data are all decimal numbers, and it is necessary to
convert them to base 10 numbers before calculating the
concentration value
For example:
If the total range is within 65536 ppm:
0B is decimal 11; The decimal of E8 is 232, then the concentration
value is: 11*256+232=3048 (ppm value of decimal).
If the total range is greater than 65536 ppm:
00 is 0 for decimal; 0B is 11 for decimal; The decimal of E8 is
232, then the concentration value is: 0*65536+11*256+232=3048 (ppm
value in decimal).
CD: CRC high
85: CRC low
CRC check values refer to the same as above
(2) Set the sensor address: For example, change the sensor address of 32 (20H) to 01
The host sends a command to the sensor:
20 06 00 00 00 01 4E BB (decimal).
20: Current sensor address
06: Function code (set sensor address).
00 00 00 01: Data area (modified sensor new address 00 01, i.e.
01).
4E: CRC high
BB: CRC low
The CRC check value is the same as above
The device returns the following data:
20 06 00 00 00 01 4E BB (decimal).
Same as input
After changing the address, the new reading command only needs to
change the first address to the current address after the
modification and perform CRC verification to obtain a new check
bit:
01 03 00 00 00 02 C4 0B (decimal).
The device returns the following data:
If the total range is within 65536 ppm:
01 03 04 00 01 0B E8 AC 8D (decimal).
If the total range is greater than 65536 ppm:
01 03 06 00 01 00 00 0B E8 1B CB (decimal).
The new set sensor address command is:
01 06 00 00 00 XX xx xx
XX: is the address that needs to be modified again
xx xx: New check digit
*This command is the serial port debugging assistant command modbus
poll under the data display window, double-click the address
display table to set a new address by modifying value
(3) About setting the initial address of the sensor
Short MCDL, zero calibration within 8 seconds, more than 10 seconds
for the initial address of the sensor The default is number 32. The
factory address of each sensor is set to 32 (20H), and when the
user modifies the sensor address, the address must be restored by
holding the corresponding forehead button continuously for more
than 10 seconds.
Host send protocol format
A protocol consists of fixed-format packets. The size of the packet
varies depending on the content of the packet.
| byte | content |
| 1 | 0x3a |
| 2 | Address of the communication unit (high sensor address) |
| 3 | Address of the communication unit (low sensor address) |
| 4 | Function code high |
| 5 | Function code low |
| 6 | First place in the data area |
| 7 | Second digit in the data area |
| 8 | Third place in the data area |
| 9 | Fourth place in the data area |
| 10 | Fifth place in the data area |
| 11 | Sixth place in the data area |
| 12 | Seventh place in the data area |
| 13 | Eighth digit in the data area |
| ....... | Other data |
| n-3 | LRC high |
| n-2 | LRC low |
| n-1 | 0x0d |
| n | 0x0a |
Address of the communication unit: This refers to the address of
the lower computer unit when the host communicates with the lower
computer. The first byte of the packet is 0x3a the last two bytes
are 0x0d 0x0a and fixed. The fourth and fifth byte of a packet
indicates whether the packet is a read command or a write command.
03 indicates that the message is a read command, and 06 indicates
that the message is a write command. LRC is used for verification
to verify the correctness of the transmitted data. Data is
transferred sequentially from low byte to high byte. Text is routed
from left to right. When all data is transferred, the data is 0x0d
by 2 cut-off bytes and 0x0a indicates the end of the data.
The device returns the protocol format
A protocol consists of fixed-format packets. The size of the packet
varies depending on the content of the packet. The return format is
the same as the sending format.
Command type
(1) Read the sensor concentration value: such as reading the current 20H sensor data
The address under the 03 function code under the Modbus poll should
be set to 3 for 0x0003, and the quantity should be set to 1 .
The host sends the command to the sensor:
3A 32 30 30 33 30 30 30 33 30 30 30 31 44 39 0D 0A (decimal) is:
200300030001D9
3a: Fixed start bit
32 30 is 20: sensor number
30 33 is 03: read sensor concentration
30 30 30 33 30 30 30 31: Data area content
30 30 30 33 address indicates that the register to be read has a
starting address of 0x0003, and 30 30 30 31 is quantity means the
number of registers to be read is 1
44: LRC high
39: LRC low
0D: Fixed end bit
0A: Fixed end bit
LRC=20+03+00+03+00+01=27H After negation, add 1 to D9H, and the
check code is 44 39
The device will return the following data:
3A 32 30 30 33 30 32 30 31 37 33 36 37 0D 0A (decimal) is:
200302017367
3A: Fixed start bit
32 30 is 20: sensor number
30 33 is 03: the reading sensor concentration indicates that the
data area is 3 bits 16-bit data 6 bytes represented
30 32 is 02: data area length
30 31 37 33 is 0173: the current CO2 concentration value is
0*16^3+1*16^2+7*16+3 by 16 times per person. The unit is PPM, which
is the concentration value expressed in 4 bytes, and the specific
value depends on the concentration read by the sensor
36: LRC high
37: LRC low
0D: Fixed end bit
0A: Fixed end bit
LRC=20+03+02+01+73=99H, add 1 to 67 after negation, and the check
code is 36 37
Read sensor address: For example, read the current 20h sensor
address 32
*Here is to read the sensor address Modbus poll under the 03
function code address should be set to 192 is the 0x00c0, quantity
Set to 1.
The host sends the command to the sensor:
3A 32 30 30 33 30 30 43 30 30 30 30 31 31 43 0D 0A (decimal).
That is : 200300c000011C
3a: Fixed start bit
32 30 is 20: sensor number
30 33 is 03: read sensor concentration
30 30 43 30 30 30 30 31: Data area content
30 30 43 30 address indicates that the register to be read has a
starting address of 0x00c0, and 30 30 30 31 is quantity indicating
the number of registers to be read 1
31: LRC high
43: LRC low
0D: Fixed end bit
0A: Fixed end bit
LRC=20+03+00+c0+00+01=E4H After negation, add 1 to 1CH, and the
check code is 31 43
The device will return the following data:
3A 32 30 30 33 30 32 30 30 32 30 42 42 0D 0A (decimal) is:
2003020020BB
3A: Fixed start bit
32 30 is 20: sensor number
30 33 is 03: the reading sensor concentration indicates that the
data area is 3 bits 16-bit data 6 bytes represented
30 32 is 02: data area length
30 30 32 30 is 0020: The current sensor address 0x0020 in the range
0-FF
42: LRC high
42: LRC low
0D: Fixed end bit
0A: Fixed end bit
LRC=20+03+02+00+20=45H, add 1 as BB after negation, and the check
code is 42 42
(2) Set the sensor address: For example, change the sensor address No. 32 to No. 01
* Modbus poll (double-click the table showing address 32 to change
the address of the 06 function code, address should be set to 192
(should be the default) is.) 0x00c0, value is set to 1 to be the
new address of the sensor.
The host sends the command to the sensor:
3A 32 30 30 36 30 30 43 30 30 30 30 31 31 39 0D 0A (decimal).
That is : 200600c0000119
3A: Fixed start bit
32 30 is 20: Sensor number
30 36 is 06: function code (set sensor address).
30 30 43 30 30 30 30 31: Data area
The start address of the 30 30 43 30 sensor register is 0x00c0, and
the modified new address of the sensor 30 31 is 01.
31: LRC high
39: LRC low
0D: Fixed end bit
0A: Fixed end bit
LRC= 20+06+00+c0+00+01=E7H After negation, add 1 to 19, and the
check code is 31 39.
The device will return the following data:
3A 32 30 30 36 30 30 43 30 30 30 30 31 31 39 0D 0A (decimal).
Same as input
(3) About setting the initial address of the sensor:
Short MCDL, zero calibration within 8 seconds, more than 10 seconds
for the initial address of the sensor The default is number 32. The
factory address of each sensor is set to 32 (20H), and when the
user modifies the sensor address, the corresponding forehead button
must be continuously held down for more than 10 seconds to restore
the address factory setting.
The sensor is installed with a positioning hole spacing of 63mm and
an aperture of 3.2mm
The wiring socket pitch is 2.54 mm
The sensor should be calibrated regularly, it is recommended that
it be no more than 3 months, and calibration is not required if automatic calibration
is turned on for long-term operation
Do not use the sensor for a long time in an environment with a high
density of dust
Please use the sensor within the range of the sensor's power supply
| Order information sheet |
| KCS530 | KCS530 CO2 concentration sensor |
| xxxx | The sensor measures the range of CO2 concentration in ppm, with a
minimum value of 2000 and a maximum value of 50000 ppm. |
| 2000 | Range 200ppm (default). |
| 10000 | Range 10000ppm |
| 50000 | Range 50000ppm |
| encode | The reaction speed is divided into two types: fast and slow |
| S | Slow (default). |
| Q | fast |
| encode | Baud rate selection, support commonly used baud rate 2400 9600
19200 38400bps, 8 bits of data, 1 bit of stop bit, no check bit:
Confirm special needs before ordering. |
| Custom | Confirm the baud rate before ordering |
| 2400 | 2400bps baud rate |
| 9600 | 9600bps baud rate |
| 19200 | 19200bps baud rate |
| 38400 | 38400bps baud rate (default) |
| encode | Serial port protocol |
| Modbus-RTU | Standard Modbus-RTU protocol (default). |
| Modbus-ASCII | Standard Modbus-ASCII protocol |
| Modbus-Self | Modbus private protocol |
| KCS530 | -2000 | -S | -38400 | -Modbus-RTU | |
URL: www.kacise.com
Tel: +86-29-17719566736
Email: sales@kacise.com
Address: Tangyan South Road, Xi'an City, Shaanxi Province, China
Appendix
| Shorthand | Full name |
| VOL | 1% VOL refers to 1% of the volume of a particular gas in air. |
| PPM | 1PPM means that the volume of a specific gas in the air accounts
for one millionth. |
| O2 | Oxygen molecules |
| LCD | LCD display |
| RS485 | Asynchronous serial port 485 |
| DC | direct current |
| AC | Communication |
| PVC | polyvinyl chloride |
