SM2130-CH4 Us er Ma nual
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Sha nghai Son
best Industrial Co., Ltd Page1
SM2130-CH4
RS485 interface protection type methane sensor
User Manual
File Version: V21.3.24
SM2130-CH4 using the standard RS485 bus MODBUS-RTU protocol,easy access to PLC
，
DCS and
other instruments or systems for monitoring methane 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
CH4 measuring range
0~5000ppm
CH4 allow deviation
±
7%
CH4 Repeatability test
±
5%
Temperature characteristics
±
0.5%/
℃
Communication Interface
RS485
Default baud rate
9600 8 n 1
Power
DC9~24V 1A
Dimensions
110mm×85mm×42mm
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-
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)
Inquiry frame (hexadecimal), sending example: Query 1# device 1 data, the host computer sends the
