KLHA KM75B96 integrated temperature humidity light sensor User Manual
- June 5, 2024
- KLHA
Table of Contents
KLHA KM75B96 integrated temperature humidity light sensor
INTRODUCTION
KM75B96 using the standard RS485 bus MODBUS-RTU protocol, easy access to PLC， DCS and other instruments or systems for monitoring carbon dioxide, temperature, humidity, and illuminance state quantities.The internal use 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, GPRS and other output methods.
Technical Parameters
| Technical parameter | Parameter value |
|---|---|
| CO2 range | 0~5000ppm |
| --- | --- |
| CO2 accuracy | ±100ppm |
| Temperature measuring range | -30℃~80℃ |
| Temperature measuring accuracy | ±0.5℃ @25℃ |
| Humidity measuring range | 0~100%RH |
| Humidity accuracy | ±3%RH @25℃ |
| Illuminance measuring range | 0~65535Lux |
| Illuminance allow deviation | ±7% |
| Repeatability test | ±5% |
| Illuminance detection chip | Import digital |
| Wavelength range | 380nm~730nm |
| Communication Interface | RS485 |
| Default baud rate | 9600 8 n 1 |
| Power | DC6~24V 1A |
| Running temperature | -40~80°C |
| Working humidity | 5%RH~90%RH |
Product Size
wiring?
Application solution
How to use?
Communication Protocol
The product uses RS485 MODBUS RTU standard protocol format, all operation or
reply commands are hexadecimal data. The default device address is 1 when the
device is shipped, the default baud rate is 9600, 8, n, 1
Read Data (Function id 0x03)
| Device ID | Function id | Start Address | Data Length | CRC16 |
|---|---|---|---|---|
| 01 | 03 | 00 00 | 00 03 | 05 CB |
For the correct query frame, the devi ce will respond with data:01 03 06 00 7B 00 00 00 00 C5 7F , the response format is parsed as follows:
| Device ID | Function id | Data Length | 数据 1 | 数据 2 | 数据 3 | Check Code |
|---|---|---|---|---|---|---|
| 01 | 03 | 06 | 00 79 | 00 7A | 00 7B | C5 7F |
Data Address Table
| Address | Start Address | Description | Data type | Value range |
|---|---|---|---|---|
| 40001 | 00 00 | 1#粉尘 |
PM2.5register
| Read only| 0~65535
40002| 00 01| 2#粉尘
PM2.5register
| Read only| 0~65535
40003| 00 02| 3#粉尘
PM2.5register
| Read only| 0~65535
40101| 00 64| model code| read/write| 0~65535
40102| 00 65| total points| read/write| 1~20
40103| 00 66| Device ID| read/write| 1~249
40104| 00 67| baud rate| read/write| 0~6
---|---|---|---|---
40105| 00 68| mode| read/write| 1~4
40106| 00 69| protocol| read/write| 1~10
Read and modify device address
| Device ID | Function id | Start Address | Data Length | CRC16 |
|---|---|---|---|---|
| FA | 03 | 00 64 | 00 02 | 90 5F |
Read or query device address
If you don’t know the c urrent device address and there is only one device on
the bus, you can use the command FA 03 00 64 00 02 90 5F Query device address.
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 |
Change device address
For example, if the current device address is 1, 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 |
Read and Modify Baud Rate
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. Read
the baud rate encoding of the current devic e. 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
followin g table:
| Device ID | Function id | Start Address | Data Length | CRC16 |
|---|---|---|---|---|
| 01 | 03 | 00 67 | 00 01 | 35 D5 |
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 | Data Length | Rate ID | CRC16 |
|---|---|---|---|---|
| 01 | 03 | 02 | 00 03 | F8 45 |
Read Correction Value
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, t hat 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 val ue,
such as 100, corresponding to the hexadecimal value of FF 9C, which is
calculated as 100 65535=65435, and then converted to hexadecimal to 0x FF 9C.
The correction value starts from 00 6B. We take the first parameter as an
example. The correction valu e 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 |
Change correction value
Fo r 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 |
Disclaimer
This document provides all information about the product, does not grant any license to intellectual property, does not express or imply, and prohibits any other means of granting any intellectual property rights, such as the statement of sales terms and conditions of this product, other issues. No liability is assumed. Furthermore, our company makes no warranties, express or implied, regarding the sale and useof this product, including the suitability for the specific use of the product, the marketability or the infringement liability for any patent, copyright or other intel lectual property rights, etc. Product specifications and product descriptions may be modified at any time without notice.
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