Technical Parameters
|
Technical parameter |
Parameter value |
|
Brand |
SONBEST |
|
Smoke measuring range |
0~2000ppm |
|
Smoke allow deviation |
±7% |
|
Smoke Repeatability test |
±5% |
|
Smoke detection chip |
Import digital |
|
Temperature characteristics |
±0.5%/℃ |
|
Interface |
RS485/4-20mA/DC0-5V |
|
Power |
DC9~26V/DC12~26V/DC9~26V |
|
Running temperature |
-30~85℃ |
|
Working humidity |
5%RH~90%RH |
Product Selection
Product DesignRS485,4-20mA,DC0-5VMultiple output methods, the products are divided into the following models depending on the output method.
|
Product model |
output method |
|
SM7571B |
RS485总线 |
|
SM7571M |
4-20mA |
|
SM7571V5 |
DC0-5V |
Why choose this product?
Application solution
How to use?
Pictures
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 is 121, for general Sobo products, the temperature and humidity data magnification is 100, and the light data The magnification is 1 or 10. The data magnification of this product is 1, the real value is: 121/1=121, 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 |
|
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 0~2000ppm, the analog output is 4~20mA current signal, conductivity and current The calculation relationship is as shown in the formula: C = (A2-A1) * (X-B1) / (B2-B1) + A1, where A2 is conductivity 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 conductivity value, and C is the calculated current value. The list of commonly used values is as follows:
|
current(mA) |
conductivityValue (ppm) |
Calculation Process |
|
4 |
0.0 |
(2000-0)*(4-4)÷(20-4)+0 |
|
5 |
125.0 |
(2000-0)*(5-4)÷(20-4)+0 |
|
6 |
250.0 |
(2000-0)*(6-4)÷(20-4)+0 |
|
7 |
375.0 |
(2000-0)*(7-4)÷(20-4)+0 |
|
8 |
500.0 |
(2000-0)*(8-4)÷(20-4)+0 |
|
9 |
625.0 |
(2000-0)*(9-4)÷(20-4)+0 |
|
10 |
750.0 |
(2000-0)*(10-4)÷(20-4)+0 |
|
11 |
875.0 |
(2000-0)*(11-4)÷(20-4)+0 |
|
12 |
1000.0 |
(2000-0)*(12-4)÷(20-4)+0 |
|
13 |
1125.0 |
(2000-0)*(13-4)÷(20-4)+0 |
|
14 |
1250.0 |
(2000-0)*(14-4)÷(20-4)+0 |
|
15 |
1375.0 |
(2000-0)*(15-4)÷(20-4)+0 |
|
16 |
1500.0 |
(2000-0)*(16-4)÷(20-4)+0 |
|
17 |
1625.0 |
(2000-0)*(17-4)÷(20-4)+0 |
|
18 |
1750.0 |
(2000-0)*(18-4)÷(20-4)+0 |
|
19 |
1875.0 |
(2000-0)*(19-4)÷(20-4)+0 |
|
20 |
2000.0 |
(2000-0)*(20-4)÷(20-4)+0 |
As shown in the above formula, when measuring 8mA, current current is 504ppm。
For example, the range is 0~2000ppm, the analog output is 0~5V DC0-5Vvoltage signal, conductivity and DC0-5Vvoltage The calculation relationship is as shown in the formula: C = (A2-A1) * (X-B1) / (B2-B1) + A1, where A2 is conductivity range upper limit, A1 is the lower limit of the range, B2 is DC0-5Vvoltage output range upper limit, B1 is the lower limit, X is the currently read conductivity value, and C is the calculated DC0-5Vvoltage value. The list of commonly used values is as follows:
|
DC0-5Vvoltage(V) |
conductivityValue (ppm) |
Calculation Process |
|
0 |
0.0 |
(2000-0)*(0-0)÷(5-0)+0 |
|
1 |
400.0 |
(2000-0)*(1-0)÷(5-0)+0 |
|
2 |
800.0 |
(2000-0)*(2-0)÷(5-0)+0 |
|
3 |
1200.0 |
(2000-0)*(3-0)÷(5-0)+0 |
|
4 |
1600.0 |
(2000-0)*(4-0)÷(5-0)+0 |
|
5 |
2000.0 |
(2000-0)*(5-0)÷(5-0)+0 |
As shown in the above formula, when measuring 2.5V, current DC0-5Vvoltage is 1000ppm。
