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SM3992B Us er Ma nual
SM3992B
RS485 interface carbon dioxide, temperature, humidity,
illuminance, soil moisture sensor
User Manual
File Version: V21.3.24
SM3992B using the standard RS485 bus MODBUS-RTU protocol,easy access to PLC，DCS and
other instruments or systems for monitoring carbon dioxide,temperature,humidity,Illuminance,soil Moisture
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.
best Industrial Co., Ltd
Page1
Sha nghai Son
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Summary of Contents for SONBEST SM3992B
- Page 1 User Manual File Version: V21.3.24 SM3992B using the standard RS485 bus MODBUS-RTU protocol,easy access to PLC，DCS and other instruments or systems for monitoring carbon dioxide,temperature,humidity,Illuminance,soil Moisture 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.
- Page 2 SM3992B Us er Ma nual Technical Parameters Technical parameter Parameter value Brand SONBEST CO2 range 0~5000ppm ±100ppm CO2 accuracy Temperature measuring range -30℃~80℃ ±0.5℃ @25℃ Temperature measuring accuracy Support sensor SHT20 Channels Input bus Humidity measuring range 0~100%RH ±3%RH @25℃...
- Page 3 SM3992B Us er Ma nual 00 00 00 05 85 C9 For the correct query frame, the device will respond with data:01 03 0A 00 7D 00 00 00 00 00 00 00 00 19 E4 , the response format is parsed as follows: 数据...
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Page 4: Change The Baud Rate
SM3992B Us er Ma nual 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. - Page 5 SM3992B Us er Ma nual 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 c urrent value plus 100 correction operation command is:01 06 00 6B 00 64 F9 FD .
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