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RS485 interface protection type methane sensor
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
Brand
CH4 measuring range
CH4 allow deviation
CH4 Repeatability test
Temperature characteristics
Communication Interface
Default baud rate
Power
Dimensions
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
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
best Industrial Co., Ltd
Sha nghai Son
SM2130-CH4 Us er Ma nual
SM2130-CH4
User Manual
File Version: V21.3.24
Core color
Red
Green
Yellow
Blue
http://www.sonbus.com/
Parameter value
SONBEST
0~5000ppm
±7%
±5%
±0.5%/℃
RS485
9600 8 n 1
DC9~24V 1A
110mm×85mm×42mm
Identification
V+
V-
A+
B-
Page1
Note
Power +
Power -
RS485 A+
RS485 B-
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Summary of Contents for SONBEST SM2130-CH4
- Page 1 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.
- Page 2 SM2130-CH4 Us er Ma nual command:01 03 00 00 00 01 84 0A . Device ID Function id Start Address Data Length CRC16 00 00 00 01 84 0A For the correct query frame, the device will respond with data:01 03 02 00 79 79 A6 , the response format is parsed as follows: 数据...
- Page 3 SM2130-CH4 Us er Ma nual Response should be in the data, after the modification is successful, the first byte is the new device address. After the general device address is changed, it will take effect immediately. At this time, the user needs to change the query command of the software at the same time.
- Page 4 SM2130-CH4 Us er Ma nual does not have this item. (2)Change correction value For example, the current state quantity is too small, we want to add 1 to its true value, and the current value plus 100 correction operation command is:01 06 00 6B 00 64 F9 FD .
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