2F. No.25, Industry E. 9 th Rd., Science-Based Industrial Park, Hsinchu, Taiwan Application Note of OGM220, AN001 V1.8
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1 Application Note of OGM220, AN001 V Introduction OGM220 series is a dual channels NDIR module having a digital output directly proportional to CO2 concentration. OGM220 is designed for multi-dropped connection that several OGM220 can be connected in the same bus for CO2 monitoring. By using dual channels CO2 sensor, OGM220 offers superior performance that can overcome the drift of light source and CO2 sensor over time. OGM220 series is ideal for customers who require their products that can meet time to market with a moderate startup cost. All units are factory calibrated and can be configured to measure CO2 concentration up to 2,000ppm. (Other maximum concentration is available upon request). OST also offers OEM version of CO2 module that can be configured to different concentration reading, threshold setting and output format. For example, OGM220 model can offer digital RS232 interface, and WAKE up mode for WiFi version. For continuous operation, the OGM220 can enable Auto drift compensation (ADC) base on weekly (at least 8 days) lowest reading during the night. If the power is OFF, the previous log data is erased and a new 8 days log is required to start ADC operation. The ADC operation does not need any trigger pin to start it. The ADC flag is checked each time when power is turned ON. OGM220 Application Note AN001 NOV 26, 2015 V 1.8 Page 1
2 2.0 Interface Connections 2F. No.25, Industry E. 9 th Rd., Science-Based Industrial Park, Hsinchu, Taiwan Figure 1 Interface connector layout of OGM220 series. Interface connector (J1): Main interface Pin 1: +5V DC Pin 2: GND Pin 3: /RST Pin 4: SCL (I2C) (optional) Pin 5: SDA (I2C) (optional) Pin 6: PWM digital output (or analog output) Pin 7: THSOUT (open drain) Pin 8: Factory reserved Pin 9: RS485+ / TXD (RS232 logic) (optional) Pin 10: RS485- / RXD (RS232 logic) (optional) Normally, pin 6 is digital PWM output that provides analog data output. The PWM output has 12 bits resolution with max output of 2.5V. For a reading of 500ppm, the PWM analog output is 0.5V. Max PWMOUT is 2.5V, which is corresponding to 2500ppm. For 0-10V analog output, user must use external OP amp with x4 gain. The PWM analog voltage output mapping is: 0V: 0ppm 0.5V: 500ppm 1V: 1000ppm 2.5V: >2500ppm OGM220 Application Note AN001 NOV 26, 2015 V 1.8 Page 2
3 Figure 2 shows the typical interface connection of OGM2xx family. If a solid state relay is used for OCCSW output, a current limit resistor R1 is required as shown in Fig. 3. The ON resistance of OCCSW or Threshold is less than 0.1Ohms, and it is open drain output that can sustains up to 20V DC for 1A maximum. OGM220 series has build-in threshold output that is programmed to be ON when CO2 concentration is higher than 1000ppm, and reset when the CO2 concentration is lower than 800ppm V NC +6V 1 2 OGM 2xx 7 THSOUT Relay NO CM load AC 110V RS485+ RS485- PWM o/p To remote PC Analog O/P + _ Digital PWM Figure 2 Typical Interface Connection +6-12V +6V 1 2 OGM 2xx R1 8 OCCSW Solid State Relay load AC 110V Analog O/P PWMOUT RS485+ RS485- To remote PC Analog O/P + _ 0-10V R3 25K R2 100K Gain x4 Figure 3 Occupancy or Threshold output with solid state relay. The OGM220 is designed for ease of system integration and connection by using multidrop serial communication (RS485). Each module can program up to 255 node ID with ID FF default as global command address. The async communication is set to 9600 bps, 8 data bit and 1 stop bit. For the PC interface, it is easy to get one RS485/RS232 converter and/or RS232 to USB converter. The communication protocol is half duplex with PC as host controller. Figure 4 shows the PC interface and multiple sensor connection. A termination resistor of 120 Ohms is required in the remote end, and the cable is twisted pair with characteristic impedance of 120 ohms. OGM220 Application Note AN001 NOV 26, 2015 V 1.8 Page 3
4 USB/RS232 RS485/RS232 Converter 120 ohms PC Host Controller OGM2xx OGM2xx OGM2xx Figure 4 Interface diagram of multi-drop RS485 communication. Each OGM2xx module must be programmed with different ID address (8 bits). The host controller can issue command to read OGM2xx output at any time. The ID address is factory preset and is shown in the last two digits of module s serial number label in Hex format. A legal ID is between 00-7FH or in decimal. 3.0 Command Protocol (V1.2): The communication protocol between PC and OGM220 modules is half-duplex asynchronous with baud rate of 9600, 8 bits data, No parity and one stop bit. Please note that the CO2 module might not response to PC request during A/D period, i.e. every 50ms between 3.05 sec interval. Therefore, PC must implement a waiting time to guarantee the reply message from CO2 module is received. The OGM220 communication protocol needs one host controller (PC), and all the CO2 modules are connected together through RS485 bus. The last unit of OGM220 must be terminated with 120 ohms bewteen RS485+ and RS485- terminal (Pin 9 and pin 10 of J1). The communication protocol is listed below: PC (host controller) (Read data): 2 nd byte: address (00-FEH) ;address of CO2 module, set by JP1 connector 3 rd byte: command byte (41H) ;read data command 4 th byte: ETX (03H) ;end of text OGM220 Reply Message: 2 nd byte: address (00-FEH) ;address of CO2 module 3 rd byte: command reply (41H) ;read data command 4 th byte: data count (06H) ; data length =06 5 th -10 th byte: data bytes in ASCII Data format is x1 x2 x3 x4 x5 ppm OGM220 Application Note AN001 NOV 26, 2015 V 1.8 Page 4
5 11 th byte: ECC check sum 12 th byte: ETX (03H) ;End of text 2F. No.25, Industry E. 9 th Rd., Science-Based Industrial Park, Hsinchu, Taiwan ECC is the exclusive OR of data starting from 4 th byte (data length) till the last byte of data. (No complement). Note:The model for 5000ppm above, output will be X1 X2 X3 X4 X5 X6 ppm(ascii) without decimal. PC (host controller) (Forced Calib): 2 nd byte: address (00-FEH) ;address of CO2 module, set by JP1 connector 3 rd byte: command byte (44H) ;forced calibration command 4 th byte: ETX (03H) ;end of text OGM-220 Reply Message: ACK (06H) Q: Can I turn ON/OFF Auto Drift Compensation feature? Ans: Yes, please follow the follow procedure to send command to OGM220 module. After that please, turn OFF power and ON again to start new feature. PC (host controller) (ADC ON/OFF control): 2 nd byte: address (00-FEH) ;address of CO2 module, or FF for global address 3 rd byte: command byte (38H) ; ADC parameter loading features 4 th byte: Length (03H) ; total data length 5 th -7 th byte: Data command Disable ADC: 3AH, 00H, 00H Enable ADC: 3AH, 6CH, 00H 8 th byte: ECC check sum 9 th byte: ETX (03H) ;end of text ECC is the exclusive OR of data starting from 4 th byte (data length) till the last byte of data (i.e. 7 th byte). (No complement). Make sure that you are following this protocol correctly, otherwise it might corrupt the EEPROM data inside. OGM220 Application Note AN001 NOV 26, 2015 V 1.8 Page 5
6 OGM220 Reply Message: ACK (06H) For user to comfirm and check ADC status, the command protocol is shown below. PC (host controller) (ADC Status Read): 2 nd byte: address (00-FEH) ;address of CO2 module, or FF for global address 3 rd byte: command byte (39H) ; read status 4 th byte: Length (01H) ; total data length 5 th byte: Data command ADC read command data: 3AH 6 th byte: ECC check sum 7 th byte: ETX (03H) ;end of text ECC is the exclusive OR of data starting from 4 th byte (data length) till the last byte of data (i.e. 5 th byte). (No complement). OGM220 Reply Message: 2 nd byte: address (00-FEH) ;address of CO2 module, or FF for global address 3 rd byte: command byte (39H) ;read status 4 th byte: Length (03H) ;total data length 5 th -7 th byte: Data command Disable ADC: 3AH, 00H, 00H Enable ADC: 3AH, 6CH, 00H 8 th byte: ECC check sum 9 th byte: ETX (03H) ;end of text ECC is the exclusive OR of data starting from 4 th byte (data length) till the last byte of data (i.e. 7 th byte). (No complement). OGM220 Application Note AN001 NOV 26, 2015 V 1.8 Page 6
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