Example: Read CO2 measurement - GMP231

Table 1. Read CO₂ measurement sequence example

Message bytes (hex)	Sent by	Content
	Master	I2C start condition
12		I2C address (write)
81		Get_parameter command
09		Device address
06		Frame length
0A		CO2 parameter ID
AA		CRC high
9F		CRC lo
		I2C repeated start condition
13		I2C address (read)
00	GMP231	Status byte (no errors, ACK)
81		Get_parameter command
09		Device address
0B		Frame length
0A		CO2 Parameter ID
69		CO2 value 653.6314 ppm
68
23
44
75		CRC high
7D		CRC lo
	Master	I2C end condition