SONBEST KM2130B-O3 User manual

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KM2130B-O3
RS485 interface protection type ozone O3 gas
sensor
User Manual
File Version: V19.8.24
KM2130B-O3 using the standard RS485 bus MODBUS-RTU protocol,easy access
to PLC，DCS and other instruments or systems for monitoring ozone state quantities.The
internaluse of high-precision sensing core and related devices to ensure high reliability
and excellent long-term stability,can be customized
RS232,RS485,CAN,4-20mA,DC0~5V\10V,ZIGBEE,Lora,WIFI,GPRSand other output
methods.
Technical Parameters
Technicalparameter
Parameter value
Brand
SONBEST
O3 range
0~1000ppm
O3 accuracy
±3%FS
Communication Interface
RS485
Default baud rate
9600 8 n 1
Power
DC9~24V 1A
Running temperature
-30~80°C
Working humidity
5%RH~90%RH
Wiringinstructions
Any incorrect wiring can cause irreversible damage to the product. Please carefully wire
the cable as follows in the case of power failure, and then connect the cable to confirm the
correctness and then use it again. Some products have no lead, the core color is for
reference only.
ID
Cor
e
colo
r
Identific
ation
Note
1
Red
V+
Pow

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er +
2
Gre
en
V-
Pow
er -
3
Yell
ow
A+
RS4
85
A+
4
Blue
B-
RS4
85
B-
Communication Protocol
The product uses RS485 MODBUS-RTU standard protocol format, all operation or reply
commands are hexadecimal data. The default device address is1 when the device is
shipped, the default baud rate is 9600, 8, n, 1
1. Read Data (Function id 0x03)
Inquiry frame (hexadecimal), sending example: Query 1# device 1 data, the host
computer sends the command:01 03 00 00 00 01 84 0A .
Device ID
Function id
Start Address
Data Length
CRC16
01
03
00 00
00 01
84 0A
For the correct query frame, the device will respond with data:01 03 02 00 79 79 A6 ,
the response format is parsed as follows:
Device ID
Function id
Data Length
data 1
Check Code
01
03
02
00 79
79 A6
Data Description: The data in the command is hexadecimal.Take data 1 as an example.
00 79 is converted to a decimal value of 121. If the data magnification is 100, the actual
value is 121/100=1.21. Others and so on.
2. Data Address Table
Address
Start Address
Description
Data type
Value range
40001
00 01
ozone
read
0~65535
40100
00 64
model code
read/write
0~65535
40101
00 65
total points
read/write
1~20

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40102
00 66
Device ID
read/write
1~249
40103
00 67
baud rate
read/write
0~6
40104
00 68
mode
read/write
1~4
40105
00 69
protocol
read/write
1~10
3 read and modify device address
(1) Read or query device address
If you don't know the current device address and there is only one device on the bus,
you can use the command FA03 00 64 00 02 90 5F Query device address.
Device ID
Function id
Start Address
Data Length
CRC16
FA
03
00 64
00 02
90 5F
FA is 250 for the general address. When you don't know the address, you can use 250
to get the real device address, 00 64 is the device model register.
For the correct query command, the device will respond, for example the response data
is: 01 03 02 07 12 3A 79, the format of which is as shown in the following table:
Device ID
Function id
Start Address
Model Code
CRC16
01
03
02
55 3C 00 01
3A 79
Response should be in the data, the first byte 01 indicates that the real address of the
current device is, 55 3C converted to decimal 20182 indicates that the current device main
model is 21820, the last two bytes 00 01 Indicates that the device has a status quantity.
(2)Change device address
For example, if the current device address is1, we want to change to 02, the command
is:01 06 00 66 00 02 E8 14 .
Device ID
Function id
Start Address
Destination
CRC16
01
06
00 66
00 02
E8 14
After the change is successful, the device will return information: 02 06 00 66 00 02 E8
27 , its format is parsed as shown in the following table:
Device ID
Function id
Start Address
Destination
CRC16
01
06
00 66
00 02
E8 27
Response should be in the data, after the modification is successful, the first byte is the
new device address. After the general device address is changed, it will take effect
immediately. At this time, the user needs to change the query command of the software at
the same time.
4 Read and Modify Baud Rate

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(1) Read baud rate
The device default factory baud rate is 9600. If you need to change it, you can change it
according to the following table and the corresponding communication protocol. For
example, read the current device's baud rate ID, the command is:01 03 00 67 00 01 35
D5 , its format is parsed as follows.
Device ID
Function id
Start Address
Data Length
CRC16
01
03
00 67
00 01
35 D5
Read the baud rate encoding of the current device. Baud rate encoding: 1 is 2400; 2 is
4800; 3 is 9600; 4 is 19200; 5 is 38400; 6 is 115200.
For the correct query command, the device will respond, for example the response data
is: 01 03 02 00 03 F8 45, the format of which is as shown in the following table:
Device ID
Function id
Data Length
Rate ID
CRC16
01
03
02
00 03
F8 45
coded according to baud rate, 03 is 9600, ie the current device has a baud rate of 9600.
(2)Change the baud rate
For example, changing the baud rate from 9600 to 38400, ie changing the code from 3
to 5, the command is: 01 06 00 67 00 05 F8 1601 03 00 66 00 01 64 15 .
Device ID
Function id
Start Address
Target Baud
Rate
CRC16
01
03
00 66
00 01
64 15
Change the baud rate from 9600 to 38400, changing the code from 3 to 5. The new
baud rate will take effect immediately, at which point the device will lose its response and
the baud rate of the device should be queried accordingly. Modified.
4 Read Correction Value
(1) Read Correction Value
When there is an error between the data and the reference standard, we can reduce the
display error by adjusting the correction value. The correction difference can be modified
to be plus or minus 1000, that is, the value range is 0-1000 or 64535 -65535. For example,
when the display value is too small, we can correct it by adding 100. The command is: 01
03 00 6B 00 01 F5 D6 . In the command 100 is hex 0x64 If you need to reduce, you can
set a negative value, such as -100, corresponding to the hexadecimal value of FF 9C,
which is calculated as 100-65535=65435, and then converted to hexadecimalto 0x FF 9C.
The correction value starts from 00 6B. We take the first parameter as an example. The

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correction value is read and modified in the same way for multiple parameters.
Device ID
Function id
Start Address
Data Length
CRC16
01
03
00 6B
00 01
F5 D6
For the correct query command, the device will respond, for example the response data
is: 01 03 02 00 64 B9 AF, the format of which is as shown in the following table:
Device ID
Function id
Data Length
Data value
CRC16
01
03
02
00 64
B9 AF
In the response data, the first byte 01 indicates the real address of the current device,
and 00 6B is the first state quantity correction value register. If the device has multiple
parameters, other parameters operate in this way. The same, the general temperature,
humidity have this parameter, the light generally does not have this item.
(2)Change correction value
For example, the current state quantity is too small, we want to add 1 to its true value,
and the current value plus 100 correction operation command is:01 06 00 6B 00 64 F9
FD .
Device ID
Function id
Start Address
Destination
CRC16
01
06
00 6B
00 64
F9 FD
After the operation is successful, the device will return information: 01 06 00 6B 00 64
F9 FD, the parameters take effect immediately after successful change.
Contact Us
Company: Shanghai Sonbest Industrial Co., Ltd
Address:Building 8,No.215 North east road,Baoshan District,Shanghai,China
Web: http://www.sonbest.com http://www.sonbus.com
SKYPE: soobuu
Email: [e-mail]