SM2130B-CH2O Us er Ma nual
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Sha nghai Son
best Industrial Co., Ltd Page1
SM2130B-CH2O
RS485 interface formaldehyde sensor
User Manual
File Version: V21.3.24
SM2130B-CH2O using the standard RS485 bus MODBUS-RTU protocol,easy access to PLC
，
DCS
and other instruments or systems for monitoring formaldehyde 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
CH2O range
0~5ppm
CH2O accuracy
±
0.1ppm
CH2O response time
≤ 60 seconds
CH2O recovery time
≤ 60 seconds
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 t he 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
core color is for reference.
Communication Protocol
The product uses RS485 MODBUS-RTU standard protocol format, all operation or reply commands
are hexadecimal data. The default device address is 1 when the device is shipped, the default baud rate is
9600, 8, n, 1
1. Read Data (Function id 0x03)
