CO Sensor User Manual
Contents
1. value and each alarm value 6 Change address Host send format address comman Data data Check Check d length lower high Instruction change all of the slave address on net to 01 If change successful new address is valid the slave return format address Comman Data Check Check d length lower high T CO2Meter com CO2 Measurement Specialists Remark cannot change the new address to broadcast address 00 7 Read measurement value Host send format Addres comman Data Check Check S d length lower high or address comman Data Check Check ee er nah Soe Instruction the concentration measurement value of the read address 01 slave The slave return format address comman Data Data Data Check Check eer ein one men oer eh Instruction Assure the measurement unit of address 01 slave is 2 see figure 3 means ppm decimal place is 1 then the measurement value of the address 01 slave is 125 8ppm 0x04EA 1258 remark This command get data must combine measurement unit and decimal place two parameter to get final measurement value 8 Restore factory calibration data Host send format address comman Data Check Check d length lower high Instruction restore factory calibration data for address 01 slave if customer calibrate the zero point and standard value make wrong then can use this command to restore factory calibration data if change successful the2. fo as Instruction the measurement test range of read address 01 slave Slave return format Addres Comman Data Data Data Check Check Instruction Assume the measurement unit of address 01 slave is 2 as show figure3 indicate ppm T CO2Meter com CO2 Measurement Specialists decimal 1 then the test range of address 01 slave is 1000 0ppm 0x2710 10000 Remarks This command get data must be combined measurement unit and decimal place two parameter to get the final test range value 4 Read unit Host send format Address Command Data Check Check lengt lower high h Instruction the measurement unit of the read address 01 slave Slave return format address comman Data data Check Check pee en er i Instruction the measurement unit of address 01 slave is 02 as show figure 3 indicate ppm Remarks This parameter is valid to all concentration value including test range value measurement value and each alarm value 5 Read decimal place Host send format address Comman Data Check Check d length lower high Instruction the decimal number of the read address 01 slave data value Slave return format address comman Data data Check Check pee en er ia Instruction the decimal place of address 01 slave is 1 if no decimal place then return value is 0 Remarks This parameter is valid to all concentration value including test range value measurement
3. new message recommended frames sent between two bytes before the completion of the message in the same frame two bytes within the interval should be controlled within 1 5 character times Likewise if a new message in front of less than then began receiving device will consider it a continuation of the previous message in the 3 5 character times This will result in a communication error because the value is definitely wrong when check B Address Slave address a byte range 1 255 OxFF Host will be contacted via the address from the machine into the address field of the message to the slave strobe When slave sending response messages it put his address in response to the address field in order to let master know which one device to respond Address 0 is used as a broadcast address so that all can be received from the device C Command That command is function code a byte range is 1 255 When the message is sent from the host to the slave the function code will let slave to know what specific tasks it need to perform For a different command the slave will make different responses If done correctly the nature of the query command the machine will return a message with the specified information the nature of the operating instruction the slave will return an empty data ie data length byte 0 message to the host to confirm the success of the operation after the completion of the specified operation If a communication error the s
4. 5 bus Adpot universal RS485 bus All of the control board is connected to a RS485 bus Communication is universal asynchronous receiver transmitter UART buad rate 9600 8 data bits 1 stop bit even parity A complete message contains an address byte a command byte a data byte length N data bytes and two parity bytes Format is as follows start address command Data data check over length T CO2Meter com CO2 Measurement Specialists A Start end Send each message frame need more than 3 5 character time recommended more than five characters time pause interval begins such as baud rate of 9600 which a character time T 1 9600 10 1 04ms therefore when the system detects that the current byte of the byte interval is greater than about 3 5 T at 3 5ms automatically the byte as a message frame s start proposed sends two messages frame interval above 5ms When receiving the first byte address each device decodes to determine whether destined for their own After the last transmitted character the same at least more than 3 5 character times recommend more than five character times pause interval to indicate the end of a frame message A new message can begin after this pause The entire message frame must be continuously sent If there is more than 3 5 character times pause time before finish frame two bytes the receiving device flushes the incomplete message and assumes that the next byte is the address field of a
5. CO Sensor User Manual GR 0001 CM 0205 USB Devkit Manual Version 3 2 Revised 12 August 2015 131 Business Center Drive Ormond Beach FL 32174 CO2Meter com 386 872 765 Sales tae 386 256 4910 Support CO2 Measurement Specialists www CO2Metercom Sales CO2Meter com T CO2Meter com CO2 Measurement Specialists Summary This pipeline type infrared gas detection module uses the principle of infrared absorption NDIR to detect the contents of carbon monoxide in a gas The module adopts imported high precision infrared detector and industrial grade high stability of single chip microcomputer the product has long life low cost high accuracy and good long term stability Serial communication baud rate is 9600 the data bits for 8 1 stop bit parity checking Its output interface is 4 20 ma output current 0 4 2 v output voltage RS485 output signal and TTL level signal Application This sensor can be widely installed for home networks ventilation systems industrial controllers public wall hangings pipeline gas detection environment monitoring etc Performance Parameters Testing environment atmosphere pressure 1020 hpa temperature 25 C gas flow rate 300ml min Detect gas the content of specific gas in the gas CO Operation principle NDIR Warm up time lt 2 minutes 20 min the best measurement condition Response time lt 5 seconds T90 15 second 300ml Min Recovery time 25 seconds Test f
6. har nEnd i unsigned char 1 J unsigned int wCrc unsigned int Oxffff for i 0 1 lt nEnd i i wCrc unsigned int pSendBuf 1 for j 0 j lt 8 j i if wCrc amp 0x01 wCrc gt gt 1 wCrc 0xA 001 j else wCrce gt gt 1 j return wCrc T CO2Meter com CO2 Measurement Specialists Instructions Instruction set as shown in figure 1 Detailed instruction format is as follows assuming these slave address are 0x01 the data in the following table are in hexadecimal If only one module on the network and send 0x01 command no return then can use address broadcast address 0x00 you can know how much the current module address 1 Read mode number Host send format Address Command Data Check Check length lower a Instruction The slave which read address is 01 The slave return format Address Command Data Data Data Check Check fees Com fee mat Yer Meh Instruction address is 01 of the slave mode number is 6001 0x1771 2 Read Type Host send format address Command Data Check Check length lower high po fw fw 2 o Instruction The measurement type of read address 01 slave Slave return format Addres Comman Data Data Check Check ee er en er ian The measurement type of read address 01 slave is see figure 2 indicates CO 3 Read test range Host send format Address Command Data Check Check length lower high Ha o
7. lave will return an exception response codes including including abnormal Function code specific definition as show in figure 1 D Data length A byte means the number of bytes of data range of the message frame if the value is 0 indicates there is no data E Date Data range including What you need slave to perform the action or the returned message by the slave adpot This information can be a value the reference address etc If data range is multi byte then the low byte first high byte later For different slave address and data information are not the same T CO2Meter com CO2 Measurement Specialists F Check Master or slave can use check code to discriminate whether the receiving information is wrong calibration method for the 16 bit cyclic redundancy code CRC16 calibration object includes all bytes of the message frame except for the two checksum byte itself CRC16 contains two byte low byte first high byte later CRC 16 code calculated by the sending device placed in the tail of the sent information The Equipment to receive information and then recalculate the information received CRC16 code comparing the calculated CRC16 code whether matches the received if they do not match then the error C language example which calculated by CRC16 code is as following CRC16 code directly calculation method pSendBuf first byte finger nEnd data check length unsigned int GetCheck unsigned char pSendBuf unsigned c
8. low rate 200 400 mL Min Resolution depends on different test range Repeatability lt 1 FS Linear error lt 1 FS Zero temperature draft lt 0 1 FS C Test temperature draft lt 0 2 FS C Operating voltage 12V DC 5 Operating current max current 50ma Average current 20 ma oe ge a Sa oO ee ON NA BB W N Operating power lt 600 mW _ J Output signal 4 20mA current a 0 4 2V voltage b Modbus RS485 digital c Modbus TTL digital 18 Air intake mouth M5 3 air outlet mouth M4 2 5 19 Operating temperature 10 C 50 C 20 Storage temperature 20 C 60 C 21 Operating humidity 0 95 RH_ non condensation 22 Operating pressure 1 0 2 atmosphere pressure 23 Dimensions 65mm 35mm 20mm L W H T CO2Meter com CO2 Measurement Specialists Schematic Diagram Ue Figure 1 schematic diagram of pipeline type module structure Note the smaller port is the inlet Wiring Diagram L COOobzoNg H 77 eg i Ee 2 Vt fm T CO2Meter com CO2 Measurement Specialists Figure 2 wire diagram of pipeline type infrared detection module Interface pin definition See figure 2 Name input outpu Pin description t number I O 5 485A or module TTL level receiving a end optional O 6 Voltageowpu04 2V O 8 Sigmalgowmd Co 10 Current output 4 20mA Signal ground Communication Protocols 1 Format for Universal RS48
9. operty or any other indirect damages as the result of use of our products Returns If the product fails under normal use during the warranty period a RMA Return Material Authorization number must be obtained from CO2Meter com After the item is received CO2Meter com will repair or replace the item at our discretion To obtain a RMA number call us at or email us at 386 256 4910 support co2meter com When requesting a RMA please provide reason for return and original order number 12 TCO2Meter com CO2 Measurement Specialists If we determine that the product failed because of improper use water damage dropping tampering electrical damage etc or if it is beyond the warranty date we will inform you of the cost to fix or replace the product For more information visit our website www CO2Meter com pages faq Contact Us We are here to help For information or technical support please contact us support co2meter com t 386 256 4910 Technical Support amp 386 872 7665 Sales www co2meter com Address CO2Meter Inc 131 Business Center Drive Ormond Beach FL 32174 USA 13
10. rns the format address comman Data Check Check d length lower high 10 TCO2Meter com CO2 Measurement Specialists Glossary Figure 1 function code definition code name Sending Response Function remark data data Read model Read the model number of selected slave a 0x04 Read type 0 byte 1 byte Read the measurement type of specific 0x05 Read test range 0 byte 2 byte Read the measurement range of selected a 0x06 Read unit 0 byte 1 byte Read the measurement unit of selected 0x07 Read decimal 0 byte 1 byte Read the decimal place of the selected a B a a a 0x10 Chang address 1 byte 0 byte Modify the communication address of the selected slave Read 0 byte 2 byte Read the measurement result of selected measurement slave value 0x31 remove the specific calibration value of a lead adjusted value the selected slave restore factory set e 8 Sew S Slave to zero 0X39 Regulate SPAN 2 byte 0 byte calibrate the current value of the selected oe ences fee E Figure 2 infrared gas type definition number Name Chemical formula remarks Serial Name Chemic remark number al formula Carbon monoxide 9o a ee ee ee a or sae dione 800 09 ammonia Ns Ca Carbon dioxide con O o Cr 23 Buifurherafuorids sre i 25s methane cus 25 yrs HC ps C5 J mo xo 11 TCO2Meter com CO2 Measurement Specialists Figure 3 Unit definition Support The quickest way to ob
11. slave return format address Comman Data Check Check d length lower high 9 Check ZERO Host send format address comman Data Check Check d length lower high instruction correct the current measurement value of read address 01 slave to new zero point general use pure nitrogen after correction please power off first then power on to observe data T CO2Meter com CO2 Measurement Specialists If correction success the slave return format address comman Data Check Check d length lower high 10 Check SPAN Host send format address comman Data Data Data Check Check d length lower high lower high Instruction calibrate the current measurement value of the read address 01 slave to a standard value determined as the standard gas concentration related with decimal places As an example of the standard gas of 10 01 of CO2 assuming that the slave unit of measure is a decimal it means that the calibration gas value corresponding data in decimal 100 0X0064 assume that the unit of measurement for the slave is 2 decimal places it means that the calibration gas value corresponding data in decimal 1001 0X03E9 assumes that the slave unit of measurement of decimal places to 0 it means that the calibration gas value corresponding data decimal 10 0X000A please power off first and then power on to observe data after calibration is complete If calibration is successful the slave retu
12. tain technical support is via email Please send all support inquires to support co2meter com Please include a clear concise definition of the problem and any relevant troubleshooting information or steps taken so far so we can duplicate the problem and quickly respond to your inquiry Warranty This sensor comes with a 90 day warranty period limited manufacturer s warranty starting from the date the sensor was shipped to the buyer During this period of time CO2Meter com warrants our products to be free from defects in materials and workmanship when used for their intended purpose and agrees to fix or replace at our discretion any part or product that fails under normal use To take advantage of this warranty the product must be returned to CO2Meter com at your expense If after examination we determine the product is defective we will repair or replace it at no additional cost to you This warranty does not cover any products that have been subjected to misuse neglect accident modifications or repairs by you or by a third party No employee or reseller of CO2Meter com s products may alter this warranty verbally or in writing Liability All liabilities under this agreement shall be limited to the actual cost of the product paid to CO2Meter com In no event shall CO2Meter com be liable for any incidental or consequential damages lost profits loss of time lost sales or loss or damage to data injury to person or personal pr
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