Product

  SM6378B using the standard RS485 bus MODBUS-RTU protocol,easy access to PLC，DCS and other instruments or systems for monitoring conductivity,temperature,humidity,CO2,CO,PM2.5,PM10,TVUC 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
Smoke measuring range	0~5000ppm
Smoke allow deviation	±7%
Smoke Repeatability test	±5%
Smoke detection chip	Import digital
Temperature characteristics	±0.5%/℃
Temperature measuring range	-30℃~80℃
Temperature measuring accuracy	±0.5℃ @25℃
PM2.5 range	0~999ug/m3
PM2.5 accuracy	±15% or ±10ug/m3 max @25℃
PM10 range	0~999ug/m3
PM10 accuracy	±15% or ±35ug/m3 max @25℃
Communication Interface	RS485
Default baud rate	9600 8 n 1
Power	DC6~24V 1A
Running temperature	-25~80°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-

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 leaves the factory, and the default baud rate is 9600,8,n,1 .
1. Read data (function code 0x03)
    Inquiry frame (hexadecimal), sending example: query 1 data of 1# device, the upper computer sends the command: 01 03 00 00 00 08 44 0C .

Address	Function Code	Start Address	Data Length	Check Code
01	03	00 00	00 08	44 0C

    For the correct query frame, the device will respond with data: 01 03 10 00 80 00 00 00 00 00 00 00 00 00 00 00 00 00 00 64 39 , response format:

Address	Function Code	Length	Data 1	Data 2	Data 3	Data 4	Data 5	Data 6	Data 7	Data 8	Check Code
01	03	10	00 79	00 7A	00 7B	00 7C	00 7D	00 7E	00 7F	00 80	64 39

    Data description: The data in the command is hexadecimal, take data 1 as an example, 00 79 is converted to decimal value as 121, assuming the data magnification is 100, then the real value is 121/100=1.21, Others and so on.
2. Common data address table

Configuration Address	Register Address	Register Description	Data Type	Value Range
40001	00 00	conductivity	Read Only	0~65535
40002	00 01	temperature	Read Only	0~65535
40003	00 02	humidity	Read Only	0~65535
40004	00 03	CO2	Read Only	0~65535
40005	00 04	CO	Read Only	0~65535
40006	00 05	PM2.5	Read Only	0~65535
40007	00 06	PM10	Read Only	0~65535
40008	00 07	TVUC	Read Only	0~65535
40101	00 64	Model Code	Read/Write	0~65535
40102	00 65	total number of measuring points	read/write	1~20
40103	00 66	device address	read/write	1~249
40104	00 67	baud rate	read/write	0~6
40105	00 68	communication mode	read/write	1~4
40106	00 69	protocol type	read/write	1~10

 

Product Pictures