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Glossary Figure 1：function code definition code name Sending data Response data Function 0x01 0x04 Read model Read type 0 byte 0 byte 2 byte 1 byte 0x05 Read test range 0 byte 2 byte 0x06 Read unit 0 byte 1 byte 0x07 Read place decimal 0 byte 1 byte Read the model number of selected slave Read the measurement type of specific Figure 2 slave Read the measurement range of selected slave Read the measurement unit of selected Figure 3 slave Read the decimal place of the selected slave 0x10 Chang address 1 byte 0 byte Modify the communication address of the selected slave 0x20 Read measurement value 0 byte 2 byte Read the measurement result of selected slave 0x31 0 byte 0X38 Remove zero 0 byte adjusted value Regulate zero 0 byte 0X39 Regulate SPAN 0 byte remove the specific calibration value of the selected slave （restore factory set） regulate the current vale of the selected slave to zero calibrate the current value of the selected slave to given calibration values 2 byte 0 byte remark Figure 2：infrared gas type definition number 01 05 06 07 09 22 23 25 26 27 28 Name Chemical formula remarks Serial number Name Chemic al formula remark Carbon monoxide CO NO2 NO2 NOm NO Sulfur dioxide SO2 ammonia NH3 Carbon dioxide CO2 Sulfur hexafuoride SF6 methane CH4 hydrocarbon HC(standard gas C3H8) N2O N2O R123a R123a 11
