SM3691B Us er Ma nual
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Sha nghai Son
best Industrial Co., Ltd Page1
SM3691B
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.
Technical Parameters
Technical parameter
Parameter value
Brand
SONBEST
Moisture Temperature range
-30
℃
~80
℃
Moisture Temperature accuracy
±
0.5
℃
@25
℃
Temperature measuring range
-30
℃
~80
℃
Temperature measuring accuracy
±
0.5
℃
@25
℃
Humidity measuring range
0~100%RH
Humidity accuracy
±
3%RH @25
℃
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.
ID
Core color
Identification
Note
1
Red
V+
Power +
2
Green
V-
Power -
3
Yellow
A+
RS485 A+
4
Blue
B-
RS485 B-
