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SM3691B using the standard RS485 bus MODBUS-RTU protocol,easy access to PLC，DCS and
other instruments or systems for monitoring soil temperature,temperature,humidity 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
Brand
Moisture Temperature range
Moisture Temperature accuracy
Temperature measuring range
Temperature measuring accuracy
Humidity measuring range
Humidity accuracy
Communication Interface
Default baud rate
Power
Running temperature
Working humidity
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.
ID
1
2
3
4
best Industrial Co., Ltd
Sha nghai Son
SM3691B Us er Ma nual
SM3691B
User Manual
File Version: V21.12.16
Core color
Red
Green
Yellow
Blue
http://www.sonbus.com/
Parameter value
SONBEST
-30℃~80℃
±0.5℃ @25℃
-30℃~80℃
±0.5℃ @25℃
0~100%RH
±3%RH @25℃
RS485
9600 8 n 1
DC9~24V 1A
-40~80°C
5%RH~90%RH
Identification
V+
V-
A+
B-
Page1
Note
Power +
Power -
RS485 A+
RS485 B-
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Summary of Contents for SONBEST SM3691B
- Page 1 User Manual File Version: V21.12.16 SM3691B using the standard RS485 bus MODBUS-RTU protocol,easy access to PLC，DCS and other instruments or systems for monitoring soil temperature,temperature,humidity 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 SM3691B Us er Ma nual In the case of broken wires, wire the wires as shown in the figure. If the product itself has no leads, the core color is for reference. Communication Protocol The product uses RS485 MODBUS-RTU standard protocol format, all operation or reply commands are hexadecimal data.
- Page 3 SM3691B Us er Ma nual (2)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...
- Page 4 SM3691B Us er Ma nual Device ID Function id Start Address Data Length CRC16 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:...
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