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SM2801B Us er Ma nual
SM2801B
RS485 bus interface soil moisture sensor
User Manual
File Version: V21.3.24
SM2801B using the standard RS485 bus MODBUS-RTU protocol,easy access to PLC，DCS and
other instruments or systems for monitoring 24%soil Moisture state quantities.The internal use of
high-precision sensing core and related devices to ensure high relia bility 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
best Industrial Co., Ltd
Page1
Sha nghai Son
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Summary of Contents for SONBEST SM2801B
- Page 1 User Manual File Version: V21.3.24 SM2801B using the standard RS485 bus MODBUS-RTU protocol,easy access to PLC，DCS and other instruments or systems for monitoring 24%soil Moisture state quantities.The internal use of high-precision sensing core and related devices to ensure high relia bility 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 SM2801B Us er Ma nual Brand SONBEST Moisture measuring range 0~24% ±3% @25℃ Moisture measuring accuracy Communication Interface RS485 Default baud rate 9600 8 n 1 Power DC9~24V 1A Running temperature -40~80° C Working humidity 5%RH~90%RH Wiring instructions 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.
- Page 3 SM2801B Us er Ma nual 40104 00 67 baud rate read/write 40105 00 68 mode read/write 40106 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 FA 03 00 64 00 02 90 5F Query device address.
- Page 4 SM2801B Us er Ma nual (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 .
- Page 5 SM2801B Us er Ma nual Company: Shanghai Sonbest Industrial Co., Ltd Address:Building 8,No.215 North east road,Baoshan District,Shanghai,China Web: http://www.sonbest.com Web: http://www.sonbus.com SKYPE: soobuu Email: sale@sonbest.com Tel: 86-021-51083595 / 66862055 / 66862075 / 66861077 best Industrial Co., Ltd Page5 Sha nghai Son...
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