SM1212B-12 Us er Ma nual
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Sha nghai Son
best Industrial Co., Ltd Page1
SM1212B-12
User Manual
File Version: V21.4.24
SM1212B-12 using the standard RS485 bus MODBUS-RTU protocol,easy access to PLC
，
DCS and
other instruments or systems for monitoring temperature,humidity@12 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
Temperature measuring range
-30
℃
~80
℃
Temperature measuring accuracy
±
0.5
℃
@25
℃
Support sensor
SHT20
Channels
12
Input bus
IIC
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
Wiring instructions
Any incorrect wiring can cause irreversible damage to the product. Pleas e 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-
In the case of broken wires, wire the wires as shown in the figure. If the product itself has no leads, the
