发布时间：2023-12-16 11:04:57 浏览次数：44次
Fixed oxygen concentration transmitter Communication Protocol (V1.0.0version)
1. Basic Agreement
The communication format is MODBUD-RTUWay, 8bit data bits, 1Bit stop bit, no verification.Baud rate: 9600BPS，support 03and 06Two MODBUSOrder.
Communication is slave mode.The host makes a command request. equipment response;After receiving the data, do data analysis. If the data meets the communication regulations, the slave responds.(The sampling period is best >200ms，To avoid excessive frequency response Interrupt, impact equipment Concentration cycle is used.)
The time from receiving the command frame to starting the response is less than 100 ms。If the slave detects the data incorrectly, or does not respond to the host in time.The host does timeout processing.
Each frame of data sent by the communication host between the master and slave contains the following information ( 16 Pricing):
Slave address | Command word | Information word | Verification code |
Slave address ：（1 bytes): slave device number, the host uses the slave address to identify the slave device for communication.The slave indicating that the address set by the user will receive the information sent by the host.Each slave must have a unique address code, and only slaves that meet the address code can respond to the reply.Address range 0x01-0xF7（1-247），0x00（00）is the broadcast address.
Command word ：（1bytes): The function code sent by the host, telling the slave what tasks to perform.support 03Read and 06Write two commands.
Information word ：（Nbytes): includes various data information, data length, read and write data, etc. in communication between the two machines.
Verification code ：（2bytes): used to detect data communication errors, using cyclic redundant code CRC16， The low is in front and the high is in back.
Communication commands ：
Read registers: 03Order
Slave address |
03 | Register address high bit | Register address Low | Number of registers High | Number of registers Low | Verification code | Verification code |
ADRH | ADRL | N_H | N_L | CRC_L | CRC_H |
Correct answer:
Slave address |
03 | Number of data bytes | data | Verification code | Verification code |
(N_H*16+N_L)*2 | (N_H*16+N_L)*2Byte data | CRC_L | CRC_H |
Single register writing: 06Order
Slave address |
06 | Register address High | Register address low bit | Register value high bit | The register value is low | Verification code | Verification code |
ADRH | ADRL | D_H | D_L | CRC_L | CRC_H |
Correct answer: (When used 00When the broadcast address is written, the slave returns as well 00address)
Slave address |
06 | Register address High | Register address low bit | Register value high bit | The register value is low | Verification code | Verification code |
ADRH | ADRL | D_H | D_L | CRC_L | CRC_H |
two, Data address table
Register address | Variable name | Variable description | Remark | |
HEX | DEC | |||
0X0100 | 256 | Equipment Status | 0-16；（0：normal; 1：Underreport; 2：High news; 16：Communication Fault) | Only supported 03instruction
|
0X0101 | 257 | Measure the concentration value | 0-65535 | Only supported 03instruction |
0X0102 | 258 | Decimal Point Point | 0-4（0：none; 1：1decimal places; 2：2decimal places; 3：3decimal places; 4：4Decimal places ;The highest position is 1，Indicates a negative number;The highest bit is zero, indicating a positive number ） | support 03/06instruction
|
0X0103 | 259 | Unit of measurement | 0-8；（0：PPM；1：PPB；2：%VOL；3：%LEL；4：mg/m3；5：℃；6：RH%；7：Kpa） | support 03/06instruction
|
0X0104 | 260 | Gas type | 0-255，See the attached table for details 1 | support 03/06instruction |
0X0105 | 261 | High limit alarm value | 00-65535 | support 03/06instruction |
0X0106 | 262 | Low limit alarm value | 00-65535 | |
0X0107 | 263 | Detection range | 00-65535 | Only supported 03instruction
|
0X0108 | 264 | equipment address | 01-247 | support 03/06instruction
|
0X0109 | 265 | ADCvalue | Read and modify the current ADCvalue( ADCThe highest position is 1，express ADCis a negative value. ADCThe highest position is 0，express ADCis a positive value.) | Only supported 03instruction
|
0X0110 | 272 | Factory zeroing | Write 0X00AAValue is valid |
Only supported 06instruction （Manufactured) |
0X0111 | 273 | Delivery Calibration value | 00-65535 | |
0X0112 | 274 | User Zero | Write 0X00AAValue is valid | Only supported 06instruction （For users) |
0X0113 | 275 | user Calibration value | 00-65535 | |
0X0114 | 276 | Restore factory value | Write 0X00AAValue is valid | |
3. Read register test command
Read 1#equipment Work status
Host send: 01 03 01 00 00 01 85 F6
Reply to the slave: 01 03 02 00 00 B8 44 （Working status is: Normal)
Read 1#equipment Measure the concentration value
Host send: 01 03 01 01 00 01 D4 36
Reply to the slave: 01 03 02 00 20 B9 9C （The real-time gas concentration is: 32）
Read 1#equipment Number of decimal places
Host send: 01 03 01 02 00 01 24 36
Reply to the slave: 01 03 02 00 01 79 84（Decimal point: 1）//Note: Gas concentration 32/Decimal point 10，Real concentration 3.2
The decimal point is as 2bit, that is divided by 100，Three are 1000
Read 1#equipment Unit of measurement
Host send: 01 03 01 03 00 01 75 F6
Reply to the slave: 01 03 02 00 00 B8 44 （ Equipment unit: ppm）
0000：PPM； 0001：PPB； 0002：PPM； 0003：‰； 0004：%；
0005：%LEL； 0006：%VOL；0007：Mg/m3； 0008：Mg/L）
Read 1#equipment Detect gas （See the attached table for detailed gas types 1）
Host send: 01 03 01 04 00 01 C4 37
Reply to the slave: 01 03 02 00 01 79 84 （ Detection of gas: CO )
Read 1#equipment High limit alarm value
Host send: 01 03 01 05 00 01 95 F7
Reply to the slave: 01 03 02 01 F4 B8 53 （ The high report value is: 500）
Read 1#equipment Low limit alarm value
Host send: 01 03 01 06 00 01 65 F7
Reply to the slave: 01 03 02 00 C8 B9 D2 （ The low value is: 200）
Read 1#equipment Detection range
Host send: 01 03 01 07 00 01 34 37
Reply to the slave: 01 03 02 03 E8 B8 FA （ Here 0x03E8Indicates the product Full scale yes ： 1000）
Read equipment address （have no idea equipment Use broadcast address in the case of address 00，Applicable to 03、06 All instructions)
Host send: 00 03 01 08 00 01 05 E5
Reply to the slave: 01 03 02 00 01 79 84 （ address: 1#）
Read 1#equipment All Information
Host send: 01 03 01 00 00 0A C4 31
Reply to the slave: 01 03 14 00 00 00 00 00 01 00 02 00 05 00 64 00 32 00 C8 00 01 00 0B 0C 3F
state Concentration value Decimal point Unit of measurement Gas type A2 A1 Range address ADC CRC16
normal 00 1 %VOL NO2 10.0 5.0 20.0 01 11 0C3F
4. Examples of writing register test commands
Revise 1#equipment High limit alarm value | |
Host send: 01 06 01 05 01 90 99 CB | CB |
Reply to the slave: 01 06 01 05 01 90 99 CB | CB （The high report value is modified to: 400）
|
Revise 1#equipment Low limit alarm value | |
Host send: 01 06 01 06 00 64 69 DC | DC |
Reply to the slave: 01 06 01 06 00 64 69 DC | DC （The low report value is modified to: 100） |
Revise equipment Address is 1#（Broadcast address 00，Only connections are allowed 1 indivual equipment ，On the bus equipment No duplicate addresses
Host send: | 00 | 06 | 01 | 08 | 00 | 01 | C9 | E5 | |
Reply to the slave: | 00 | 06 | 01 | 08 | 00 | 01 | C9 | E5 | （The device address is modified to: 1#） |
right 1#equipment Factory zeroing
Host send: 01 06 01 10 00 AA 09 8C
Reply to the slave: 01 06 01 10 00 AA 09 8C （ The device adjusts the current zero point value)
right 1#equipment Carry out factory calibration ( equipment The calibration operation must be carried out after the value is stable)
Host send: 01 06 01 11 01 F4 D8 24
Reply to the slave: 01 06 01 11 01 F4 D8 24 （ Equipment access 50.0 Numerical standard gas, recalibrated to: 50.0）
right 1#equipment Restore factory value (restore default After value, equipment Will restart ，If there is no abnormality, please do not recover! ! ）
Host send: 01 06 01 14 00 AA 48 4D
Reply to the slave: 01 06 01 14 00 AA 48 4D （ The device restores all data to: factory value and restart)
Attached 1 Types of gas detection
serial number | Gas type | Chinese | serial number | Gas type | Chinese |
0 | N2 | Nitrogen | 42 | C3H8O | Propanol |
1 | CO | Carbon monoxide | 43 | iC3H8O | Isopropanol |
2 | H2S | Hydrogen sulfide | 44 | C4H10O | Butyl alcohol |
3 | O2 | oxygen | 45 | CH2O | formaldehyde |
4 | EX | Flammable | 46 | C2H4O | Acetaldehyde |
5 | SO2 | Sulfur dioxide | 47 | C3H6O | Propionaldehyde |
6 | NH3 | Ammonia | 48 | C3H4O | Aceraldehyde |
7 | H2 | hydrogen | 49 | C2H2 | Acetylene |
8 | CH3Br | Methane bromide | 50 | C6H6 | benzene |
9 | O3 | ozone | 51 | C7H8 | Toluene |
10 | TVOC | Total volatiles | 52 | C8H10 | Xylene |
11 | CL2 | Chlorine | 53 | C8H8 | Styrene |
12 | HCL | Hydrogen chloride | 54 | C6H6O | phenol |
13 | NO | Nitrogen monoxide | 55 | ETO | Ethylene oxide |
14 | NO2 | Nitrogen dioxide | 56 | C2H8O2 | Ethyl acetate |
15 | PH3 | Hydrogen Phosphide | 57 | NMHC | Total non-methane hydrocarbons |
16 | ArH3 | Hydrogen Arsenic | 58 | F2S2O | Sulfolyl fluoride |
17 | HCN | Hydrogen cyanide | 59 | GAS | |
18 | CO2 | carbon dioxide | 60 | ||
19 | SF6 | Sulfur hexafluoride | 61 | ||
20 | Br2 | Bromine gas | 62 | ||
21 | HBr | Hydrogen bromide | 63 | ||
22 | F2 | Fluorine | 64 | ||
23 | HF | Hydrogen fluoride | 65 | ||
24 | N2O | nitrous oxide | 66 | ||
25 | H2O2 | Hydrogen peroxide | 67 | ||
26 | NOX | Nitrogen oxides | 68 | ||
27 | SOX | Sulfide | 69 | ||
28 | Odor | Smell | 70 | ||
29 | VOC | Volatiles | |||
30 | CH4 | Methane | |||
31 | C2H6 | Ethane | |||
32 | C3H8 | Propane | |||
33 | C4H10 | Butane | 100 | Temperature | temperature |
34 | iC4H10 | Isobutane | 101 | Humidity | humidity |
35 | C5H12 | Pentane | 102 | Pressure | Air pressure |
36 | C2H4 | Ethylene | |||
37 | C3H6 | Acrylic | |||
38 | C4H8 | Butene | |||
39 | iC4H8 | Isobutylene | |||
40 | CH4O | Methanol | |||
41 | C2H6O | Ethanol |
Attached 2 Gas detection data unit
Serial number | unit |
0 | PPM |
1 | PPB |
2 | %VOL |
3 | %LEL |
4 | Mg/m3 |
5 | g/m3 |
6 | ug/m3 |
7 | ℃ |
8 | %RH |
9 | Kpa |
10 | umol/mol |
11 | Mpa |
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