Product

Technical Parameters

Technical parameter	Parameter value
Brand	XUNCHIP
CO2 range	0~5000ppm
CO2 accuracy	±100ppm
Interface	RS485/4-20mA/DC0-10V
Power	DC5~24V 1A
Power	DC12~24V 1A
Running temperature	-30~85℃
Working humidity	5%RH~90%RH

Product Selection

    Product DesignRS485,4-20mA,DC0-10VMultiple output methods, the products are divided into the following models depending on the output method.

Product model	output method
XM8171B	RS485总线
XM8171M	4-20mA
XM8171V10	DC0-10V

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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 module or NON-Recorder default baud rate is 9600,8,n,1 ,but data recorder default baud rate is 115200 .
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 01 84 0A .

Address	Function Code	Start Address	Data Length	Check Code
01	03	00 00	00 01	84 0A

    For the correct query frame, the device will respond with data: 01 03 02 00 79 79 A6 , response format:

Address	Function Code	Length	Data 1	Check Code
01	03	02	00 79	79 A6

    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	carbon dioxide	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

  For example, the range is 400~5000ppm, the analog output is 4~20mA current signal, carbon dioxide and current The calculation relationship is as shown in the formula: C = (A2-A1) * (X-B1) / (B2-B1) + A1, where A2 is carbon dioxide range upper limit, A1 is the lower limit of the range, B2 is current output range upper limit, B1 is the lower limit, X is the currently read carbon dioxide value, and C is the calculated current value. The list of commonly used values is as follows:

current(mA)	carbon dioxideValue (ppm)	Calculation Process
4	400.0	(5000-400)*(4-4)÷(20-4)+400
5	687.5	(5000-400)*(5-4)÷(20-4)+400
6	975.0	(5000-400)*(6-4)÷(20-4)+400
7	1262.5	(5000-400)*(7-4)÷(20-4)+400
8	1550.0	(5000-400)*(8-4)÷(20-4)+400
9	1837.5	(5000-400)*(9-4)÷(20-4)+400
10	2125.0	(5000-400)*(10-4)÷(20-4)+400
11	2412.5	(5000-400)*(11-4)÷(20-4)+400
12	2700.0	(5000-400)*(12-4)÷(20-4)+400
13	2987.5	(5000-400)*(13-4)÷(20-4)+400
14	3275.0	(5000-400)*(14-4)÷(20-4)+400
15	3562.5	(5000-400)*(15-4)÷(20-4)+400
16	3850.0	(5000-400)*(16-4)÷(20-4)+400
17	4137.5	(5000-400)*(17-4)÷(20-4)+400
18	4425.0	(5000-400)*(18-4)÷(20-4)+400
19	4712.5	(5000-400)*(19-4)÷(20-4)+400
20	5000.0	(5000-400)*(20-4)÷(20-4)+400

    As shown in the above formula, when measuring 8mA, current current is 1154ppm。
  For example, the range is 400~5000ppm, the analog output is 0~10V DC0-10Vvoltage signal, carbon dioxide and DC0-10Vvoltage The calculation relationship is as shown in the formula: C = (A2-A1) * (X-B1) / (B2-B1) + A1, where A2 is carbon dioxide range upper limit, A1 is the lower limit of the range, B2 is DC0-10Vvoltage output range upper limit, B1 is the lower limit, X is the currently read carbon dioxide value, and C is the calculated DC0-10Vvoltage value. The list of commonly used values is as follows:

DC0-10Vvoltage(V)	carbon dioxideValue (ppm)	Calculation Process
0	400.0	(5000-400)*(0-0)÷(10-0)+400
1	860.0	(5000-400)*(1-0)÷(10-0)+400
2	1320.0	(5000-400)*(2-0)÷(10-0)+400
3	1780.0	(5000-400)*(3-0)÷(10-0)+400
4	2240.0	(5000-400)*(4-0)÷(10-0)+400
5	2700.0	(5000-400)*(5-0)÷(10-0)+400
6	3160.0	(5000-400)*(6-0)÷(10-0)+400
7	3620.0	(5000-400)*(7-0)÷(10-0)+400
8	4080.0	(5000-400)*(8-0)÷(10-0)+400
9	4540.0	(5000-400)*(9-0)÷(10-0)+400
10	5000.0	(5000-400)*(10-0)÷(10-0)+400

    As shown in the above formula, when measuring 5V, current DC0-10Vvoltage is 2300ppm。